Sep. 2017-Present: Postdoctoral Research Associate in Center for Clean Energy Technology, School of Mathematical an Pnysical Scienes, Faculty of Science,University of Technology Sydney
Sep. 2013-Jul. 2017: Ph. D in Materials Science and Engineering, School of Materials Science and Engineering, Tsinghua University
Sep. 2010-Jan. 2013: M. S. in Materials Science and Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing
Sep. 2006-Jul. 2010: B. S. in Materials Science and ENgineering, School of Energy Power and Mechanical Engineering, North China Electric Power University (Beijing)
•National Scholarship for Doctoral Students, Tsinghua University, 2015.
•National Scholarship for Master Students, University of Science and Technology Beijing, 2013.
•The Outstanding Graduates in Beijing, University of Science and Technology Beijing, 2013.
•Excellent Academic dissertation of USTB, University of Science and Technology Beijing, 2013.
Can supervise: YES
•Design and synthesis of specialized solid polymer electrolytes and nano electrode materials for various advanced energy storage devices including flexible lithium-ion batteries, lithium metal batteries, lithium-sulfur batteries, lithium-ion sulfur batteries, sodium-ion batteries and supercapacitors.
•Investigation of the interfacial mechanisms in such devices.
Xiong, P, Zhang, X, Wan, H, Wang, S, Zhao, Y, Zhang, J, Zhou, D, Gao, W, Ma, R, Sasaki, T & Wang, G 2019, 'Interface Modulation of Two-Dimensional Superlattices for Efficient Overall Water Splitting.', Nano letters, vol. 19, no. 7, pp. 4518-4526.View/Download from: UTS OPUS or Publisher's site
Molecular-scale modulation of interfaces between different unilamellar nanosheets in superlattices is promising for efficient catalytic activities. Here, three kinds of superlattices from alternate restacking of any two of the three unilamellar nanosheets of MoS2, NiFe-layered double hydroxide (NiFe-LDH), and graphene are systematically investigated for electrocatalytic water splitting. The MoS2/NiFe-LDH superlattice exhibits a low overpotential of 210 and 110 mV at 10 mA cm-2 for oxygen evolution reaction (OER) and alkaline hydrogen evolution reaction (HER), respectively, superior than MoS2/graphene and NiFe-LDH/graphene superlattices. High activity and stability toward the overall water splitting are also demonstrated on the MoS2/NiFe-LDH superlattice bifunctional electrocatalyst, outperforming the commercial Pt/C-RuO2 couple. This outstanding performance can be attributed to optimal adsorption energies of both HER and OER intermediates on the MoS2/NiFe-LDH superlattice, which originates from a strong electronic coupling effect at the heterointerfaces. These results herald the interface modulation of superlattices providing a promising approach for designing advanced electrocatalysts.
Chen, Y, Zhang, W, Zhou, D, Tian, H, Su, D, Wang, C, Stockdale, D, Kang, F, Li, B & Wang, G 2019, 'Co-Fe Mixed Metal Phosphide Nanocubes with Highly Interconnected-Pore Architecture as an Efficient Polysulfide Mediator for Lithium-Sulfur Batteries.', ACS nano, vol. 13, no. 4, pp. 4731-4741.View/Download from: UTS OPUS or Publisher's site
Lithium-sulfur (Li-S) batteries have been regarded as one of the most promising candidates for next-generation energy storage owing to their high energy density and low cost. However, the practical deployment of Li-S batteries has been largely impeded by the low conductivity of sulfur, the shuttle effect of polysulfides, and the low areal sulfur loading. Herein, we report the synthesis of uniform Co-Fe mixed metal phosphide (Co-Fe-P) nanocubes with highly interconnected-pore architecture to overcome the main bottlenecks of Li-S batteries. With the highly interconnected-pore architecture, inherently metallic conductivity, and polar characteristic, the Co-Fe-P nanocubes not only offer sufficient electrical contact to the insulating sulfur for high sulfur utilization and fast redox reaction kinetics but also provide abundant adsorption sites for trapping and catalyzing the conversion of lithium polysulfides to suppress the shuttle effect, which is verified by both the comprehensive experiments and density functional theory calculations. As a result, the sulfur-loaded Co-Fe-P (S@Co-Fe-P) nanocubes delivered a high discharge capacity of 1243 mAh g-1 at 0.1 C and excellent cycling stability for 500 cycles with an average capacity decay rate of only 0.043% per cycle at 1 C. Furthermore, the S@Co-Fe-P electrode showed a high areal capacity of 4.6 mAh cm-2 with superior stability when the sulfur loading was increased to 5.5 mg cm-2. More impressively, the prototype soft-package Li-S batteries based on S@Co-Fe-P cathodes also exhibited superior cycling stability with great flexibility, demonstrating their great potential for practical applications.
Deng, J, Yu, X, Qin, X, Zhou, D, Zhang, L, Duan, H, Kang, F, Li, B & Wang, G 2019, 'Co–B Nanoflakes as Multifunctional Bridges in ZnCo 2 O 4 Micro-/Nanospheres for Superior Lithium Storage with Boosted Kinetics and Stability', Advanced Energy Materials, vol. 9, no. 14.View/Download from: UTS OPUS or Publisher's site
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Transition metal oxides hold great promise as high-energy anodes in next-generation lithium-ion batteries. However, owing to the inherent limitations of low electronic/ionic conductivities and dramatic volume change during charge/discharge, it is still challenging to fabricate practically viable compacted and thick TMO anodes with satisfactory electrochemical performance. Herein, with mesoporous cobalt–boride nanoflakes serving as multifunctional bridges in ZnCo 2 O 4 micro-/nanospheres, a compacted ZnCo 2 O 4 /Co–B hybrid structure is constructed. Co–B nanoflakes not only bridge ZnCo 2 O 4 nanoparticles and function as anchors for ZnCo 2 O 4 micro-/nanospheres to suppress the severe volume fluctuation, they also work as effective electron conduction bridges to promote fast electron transportation. More importantly, they serve as Li + transfer bridges to provide significantly boosted Li + diffusivity, evidenced from both experimental kinetics analysis and density functional theory calculations. The mesopores within Co–B nanoflakes help overcome the large Li + diffusion barriers across 2D interfaces. As a result, the ZnCo 2 O 4 /Co–B electrode delivers high gravimetric/volumetric/areal capacities of 995 mAh g −1 /1450 mAh cm −3 /5.10 mAh cm −2 , respectively, with robust rate capability and long-term cyclability. The distinct interfacial design strategy provides a new direction for designing compacted conversion-type anodes with superior lithium storage kinetics and stability for practical applications.
Han, C, Shi, R, Zhou, D, Li, H, Xu, L, Zhang, T, Li, J, Kang, F, Wang, G & Li, B 2019, 'High-Energy and High-Power Nonaqueous Lithium-Ion Capacitors Based on Polypyrrole/Carbon Nanotube Composites as Pseudocapacitive Cathodes.', ACS applied materials & interfaces, vol. 11, no. 17, pp. 15646-15655.View/Download from: UTS OPUS or Publisher's site
The energy density of present lithium-ion capacitors (LICs) is greatly hindered by the limited specific capacities of porous carbon electrodes. Herein, we report the development of a nonaqueous LIC system by integrating two reversible electrode processes, that is, anion doping/undoping in a core-shell structured polypyrrole/carbon nanotube (Ppy@CNT) composite cathode and Li+ intercalation/deintercalation in a Fe3O4@carbon (C) anode. The hybrid Ppy@CNT is utilized as a promising pseudocapacitive cathode for nonaqueous LIC applications. The Ppy provides high pseudocapacitance via the doping/undoping reaction with PF6- anions. Meanwhile, the CNT backbone significantly enhances the electrical conductivity. The as-developed composite delivers noteworthy capacities with exceptional stability (98.7 mA h g-1 at 0.1 A g-1 and retains 89.7% after cycling at 3 A g-1 for 1000 times in Li-half cell), which outperforms state-of-art porous carbon cathodes in present LICs. Furthermore, when paired with Fe3O4@C anodes, the as-developed LICs demonstrate a superior energy density of 101.0 W h kg-1 at 2709 W kg-1 and still maintain 70 W h kg-1 at an increased power density of 17 186 W kg-1. The findings of this work provides new knowledge on the cathode materials for LICs.
Man, Z, Li, P, Zhou, D, Zang, R, Wang, S, Li, P, Liu, S, Li, X, Wu, Y, Liang, X & Wang, G 2019, 'High-performance lithium-organic batteries by achieving 16 lithium storage in poly(imine-anthraquinone)', Journal of Materials Chemistry A, vol. 7, no. 5, pp. 2368-2375.View/Download from: UTS OPUS or Publisher's site
© 2019 The Royal Society of Chemistry. Organic materials have attracted intensive research interest in lithium ion batteries (LIBs) due to their advantages of structural diversity, low cost and sustainability in nature. Here we report a highly conjugated organic framework, poly(imine-anthraquinone) (PIAQ), as the anode material of LIBs. It was synthesized by a green and environmentally friendly in situ solvothermal condensation reaction. When applied in LIBs, the PIAQ exhibits an outstanding reversible specific capacity (1231 mA h g -1 at 200 mA g -1 ), excellent long-term cycle stability (486 mA h g -1 , 1000 cycles at 1 A g -1 ), and good rate performance. As further revealed by density functional theory (DFT) calculations, the Li storage mechanism of PIAQ is a reversible process associated with a six-step insertion/deintercalation of 16 Li + per molecule, which is well consistent with the experimental results. Both the structural stability and excellent performance of PIAQ make it one of the most promising organic electrode materials for next-generation LIBs.
Sahu, TS, Choi, S, Jaumaux, P, Zhang, J, Wang, C, Zhou, D & Wang, G 2019, 'Squalene-derived sulfur-rich copolymer@ 3D graphene-carbon nanotube network cathode for high-performance lithium-sulfur batteries', POLYHEDRON, vol. 162, pp. 147-154.View/Download from: Publisher's site
Tang, X, Zhou, D, Li, P, Guo, X, Wang, C, Kang, F, Li, B & Wang, G 2019, 'High-Performance Quasi-Solid-State MXene-Based Li-I Batteries.', ACS central science, vol. 5, no. 2, pp. 365-373.View/Download from: UTS OPUS or Publisher's site
Lithium-iodine (Li-I) batteries have attracted tremendous attention due to their high energy and power densities as well as the low cost of iodine. However, the severe shuttle effect of iodine species and the uncontrollable lithium dendrite growth have strongly hindered their practical applications. Here we successfully develop a quasi-solid-state Li-I battery enabled by a MXene-based iodine cathode and a composite polymer electrolyte (CPE) containing NaNO3 particles dispersing in a pentaerythritol-tetraacrylate-based (PETEA-based) gel polymer electrolyte. As verified by experimental characterizations and first-principle calculations, the abundant functional groups on the surface of MXene sheets provide strong chemical binding to iodine species, and therefore immobilize their shuttling. The PETEA-based polymer matrix simultaneously suppresses the diffusion of iodine species and stabilizes the Li anode/CPE interface against dendrite growth. The NaNO3 particles act as an effective catalyst to facilitate the transformation kinetics of LiI3 on the cathode. Owing to such synergistic optimization, the as-developed Li-I batteries deliver high energy/power density with long cycling stability and good flexibility. This work opens up a new avenue to improve the performance of Li-I batteries.
Zhou, D, Tkacheva, A, Tang, X, Sun, B, Shanmukaraj, D, Li, P, Zhang, F, Armand, M & Wang, G 2019, 'Stable Conversion Chemistry-Based Lithium Metal Batteries Enabled by Hierarchical Multifunctional Polymer Electrolytes with Near-Single Ion Conduction', ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, vol. 58, no. 18, pp. 6001-6006.View/Download from: UTS OPUS or Publisher's site
Shi, R, Han, C, Duan, H, Xu, L, Zhou, D, Li, H, Li, J, Kang, F, Li, B & Wang, G 2018, 'Redox-Active Organic Sodium Anthraquinone-2-Sulfonate (AQS) Anchored on Reduced Graphene Oxide for High-Performance Supercapacitors', Advanced Energy Materials, vol. 8, no. 31.View/Download from: UTS OPUS or Publisher's site
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Redox active organic quinones are potentially low cost, sustainable, and high-energy pseudocapacitive materials due to their fast and reversible redox reactivity. However, their electrically insulating nature prevents any practical application. Herein, for the first time, sodium anthraquinone-2-sulfonate (AQS) is examined as an organic redox-active compound and highly conductive graphene nanosheets are incorporated to enhance the electronic conductivity. The SO 3− functional group of AQS offers excellent hydrophilicity, which promotes the molecular level binding of AQS with reduced graphene oxide (rGO) and leads to a 3D interconnected xerogel (AQS@rGO). The composite exhibits a high specific capacitance of 567.1 F g −1 at 1 A g −1 with a stable capacity retention of 89.1% over 10 000 cycles at 10 A g −1 . More importantly, the optimized composite maintains a high capacitance of 315.1 F g −1 even at 30 A g −1 due to the high pseudocapacitance of AQS and the capacitive contribution of rGO. First-principles calculations further elucidate that AQS offers strong adhesion to rGO sheets with the formation of a space-charge layer, which is favorable for the pseudocapacitance of AQS. This work opens a new avenue for developing high-performance supercapacitors though rational combination of redox organic molecules with highly conductive graphene.
Su, D, Zhou, D, Wang, C & Wang, G 2018, 'Toward High Performance Lithium–Sulfur Batteries Based on Li2S Cathodes and Beyond: Status, Challenges, and Perspectives', Advanced Functional Materials, vol. 28, no. 38.View/Download from: UTS OPUS or Publisher's site
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Lithium sulfur (Li–S) batteries are attracting ever-increasing interests as a new generation rechargeable battery system with high energy density and low cost. Li–S batteries will fulfill their theoretical potential if the problem of polysulfides shuttle effect can be solved. Therefore, tremendous efforts have been devoted to overcoming this problem from the aspects of physical confinement and chemisorption of polysulfides. Recently, it is discovered that replacing sulfur cathodes with lithium sulfide (Li2S) can not only largely avoid the volume expansion issue during cycling, but it can also work with anode materials other than lithium metal to eliminate serious safety concerns for traditional Li–S batteries. However, there are many challenges for developing practical Li metal-free Li–S battery systems, because Li2S-based cathode materials are moisture-sensitive and prelithiation of the non-Li metal anode materials is usually required for practical applications. This study reviews the recent advances of Li-S batteries based on Li2S cathode with features of improved safety, high Coulombic efficiency, and high energy density. The electrode activation processes are also discussed, which is critical for achieving high performances. It is anticipated that the extensive efforts will lead to breakthroughs for the development of Li2S cathode -based Li-S batteries.
Xu, X, Zhou, D, Qin, X, Lin, K, Kang, F, Li, B, Shanmukaraj, D, Rojo, T, Armand, M & Wang, G 2018, 'A room-temperature sodium-sulfur battery with high capacity and stable cycling performance.', Nature communications, vol. 9, no. 1, pp. 3870-3870.View/Download from: UTS OPUS or Publisher's site
High-temperature sodium-sulfur batteries operating at 300-350 °C have been commercially applied for large-scale energy storage and conversion. However, the safety concerns greatly inhibit their widespread adoption. Herein, we report a room-temperature sodium-sulfur battery with high electrochemical performances and enhanced safety by employing a "cocktail optimized" electrolyte system, containing propylene carbonate and fluoroethylene carbonate as co-solvents, highly concentrated sodium salt, and indium triiodide as an additive. As verified by first-principle calculation and experimental characterization, the fluoroethylene carbonate solvent and high salt concentration not only dramatically reduce the solubility of sodium polysulfides, but also construct a robust solid-electrolyte interface on the sodium anode upon cycling. Indium triiodide as redox mediator simultaneously increases the kinetic transformation of sodium sulfide on the cathode and forms a passivating indium layer on the anode to prevent it from polysulfide corrosion. The as-developed sodium-sulfur batteries deliver high capacity and long cycling stability.
Zhou, D, Chen, Y, Li, B, Fan, H, Cheng, F, Shanmukaraj, D, Rojo, T, Armand, M & Wang, G 2018, 'A Stable Quasi-Solid-State Sodium-Sulfur Battery.', Angewandte Chemie (International ed. in English), vol. 57, no. 32, pp. 10168-10172.View/Download from: UTS OPUS or Publisher's site
Ambient-temperature sodium-sulfur (Na-S) batteries are considered a promising energy storage system due to their high theoretical energy density and low costs. However, great challenges remain in achieving a high rechargeable capacity and long cycle life. Herein we report a stable quasi-solid-state Na-S battery enabled by a poly(S-pentaerythritol tetraacrylate (PETEA))-based cathode and a (PETEA-tris[2-(acryloyloxy)ethyl] isocyanurate (THEICTA))-based gel polymer electrolyte. The polymeric sulfur electrode strongly anchors sulfur through chemical binding and inhibits the shuttle effect. Meanwhile, the in situ formed polymer electrolyte with high ionic conductivity and enhanced safety successfully stabilizes the Na anode/electrolyte interface, and simultaneously immobilizes soluble Na polysulfides. The as-developed quasi-solid-state Na-S cells exhibit a high reversible capacity of 877 mA h g-1 at 0.1 C and an extended cycling stability.
Li, X, Qian, K, He, Y-B, Liu, C, An, D, Li, Y, Zhou, D, Lin, Z, Li, B, Yang, Q-H & Kang, F 2017, 'A dual-functional gel-polymer electrolyte for lithium ion batteries with superior rate and safety performances', JOURNAL OF MATERIALS CHEMISTRY A, vol. 5, no. 35, pp. 18888-18895.View/Download from: UTS OPUS or Publisher's site
Liu, M, Li, Q, Qin, X, Liang, G, Han, W, Zhou, D, He, Y-B, Li, B & Kang, F 2017, 'Suppressing Self-Discharge and Shuttle Effect of Lithium-Sulfur Batteries with V2O5-Decorated Carbon Nanofiber Interlayer', Small, vol. 13, no. 12.View/Download from: UTS OPUS or Publisher's site
V2O5 decorated carbon nanofibers (CNFs) are prepared and used as a multifunctional interlayer for a lithium–sulfur (Li–S) battery. V2O5 anchored on CNFs can not only suppress the shuttle effect of polysulfide by the strong adsorption and redox reaction, but also work as a high-potential dam to restrain the self-discharge behavior in the battery. As a result, Li–S batteries with a high capacity and long cycling life can be stored and rested for a long time without obvious capacity fading.
Liu, M, Ren, Y, Zhou, D, Jiang, H, Kang, F & Zhao, T 2017, 'A Lithium/Polysulfide Battery with Dual-Working Mode Enabled by Liquid Fuel and Acrylate-Based Gel Polymer Electrolyte.', ACS Applied Materials and Interfaces, vol. 9, no. 3, pp. 2526-2534.View/Download from: UTS OPUS or Publisher's site
The low density associated with low sulfur areal loading in the solid-state sulfur cathode of current Li-S batteries is an issue hindering the development of this type of battery. Polysulfide catholyte as a recyclable liquid fuel was proven to enhance both the energy density and power density of the battery. However, a critical barrier with this lithium (Li)/polysulfide battery is that the shuttle effect, which is the crossover of polysulfides and side deposition on the Li anode, becomes much more severe than that in conventional Li-S batteries with a solid-state sulfur cathode. In this work, we successfully applied an acrylate-based gel polymer electrolyte (GPE) to the Li/polysulfide system. The GPE layer can effectively block the detrimental diffusion of polysulfides and protect the Li metal from the side passivation reaction. Cathode-static batteries utilizing 2 M catholyte (areal sulfur loading of 6.4 mg cm-2) present superior cycling stability (727.4 mAh g-1 after 500 cycles at 0.2 C) and high rate capability (814 mAh g-1 at 2 C) and power density (∼10 mW cm-2), which also possess replaceable and encapsulated merits for mobile devices. In the cathode-flow mode, the Li/polysulfide system with catholyte supplied from an external tank demonstrates further improved power density (∼69 mW cm-2) and stable cycling performance. This novel and simple Li/polysulfide system represents a significant advancement of high energy density sulfur-based batteries for future power sources.
Liu, R, Lei, Y, Yu, W, Wang, H, Qin, L, Han, D, Yang, W, Zhou, D, He, Y, Zhai, D, Li, B & Kang, F 2017, 'Achieving Low Overpotential Lithium-Oxygen Batteries by Exploiting a New Electrolyte Based on N,N'-Dimethylpropyleneurea', ACS ENERGY LETTERS, vol. 2, no. 2, pp. 313-318.View/Download from: UTS OPUS or Publisher's site
Qian, Y, Niehoff, P, Zhou, D, Adam, R, Mikhailova, D, Pyschik, M, Börner, M, Klöpsch, R, Rafaja, D, Schumacher, G, Ehrenberg, H, Winter, M & Schappacher, F 2017, 'Investigation of nano-sized Cu(II)O as a high capacity conversion material for Li-metal cells and lithium-ion full cells', Journal of Materials Chemistry A, vol. 5, no. 14, pp. 6556-6568.View/Download from: UTS OPUS or Publisher's site
© The Royal Society of Chemistry. In this study, self-prepared nanostructured CuO electrodes show no capacity decay for 40 cycles at 0.1C in Li metal cells. The reaction mechanisms of the CuO electrodes are investigated. With the help of in situ EIS, in situ XRD, TEM, XAS, SQUID, IC and GC-MS, it is found that the as-prepared CuO electrode undergoes significant phase and composition changes during the initial lithiation, with the transformation of CuO to nano-crystalline Cu. During the 1stdelithiation, Cu is inhomogeneously oxidized, which yields a mixture of Cu2O, Cu2−xO and Cu. The incomplete conversion reaction during the 1stcycle is accompanied by the formation and partial decomposition of the solid electrolyte interphase (SEI) as the side reactions. Nevertheless, from the 1stto the 5thdelithiation, the oxidation state of Cu approaches +2. After an additional formation step, the transformation to Cu and back to Cu2−xO remains stable during the subsequent long-term cycling with no electrolyte decomposition products detected. The LiNi1/3Mn1/3Co1/3O2(NMC-111)/CuO full cells show high capacities (655.8 ± 0.6, 618.6 ± 0.9 and 290 ± 2 mA h g−1at 0.1, 1 and 10C, respectively), within the voltage range of 0.7-4.0 V at 20 °C and a high capacity retention (85% after 200 cycles at 1C).
Wang, J, Gao, R, Zhou, D, Chen, Z, Wu, Z, Schumacher, G, Hu, Z & Liu, X 2017, 'Boosting the Electrocatalytic Activity of Co3O4 Nanosheets for a Li-O2 Battery through Modulating Inner Oxygen Vacancy and Exterior Co3+/Co2+ Ratio', ACS Catalysis, vol. 7, no. 10, pp. 6533-6541.View/Download from: UTS OPUS or Publisher's site
© 2017 American Chemical Society. Rechargeable Li-O2batteries have been considered as the most promising chemical power owing to their ultrahigh specific energy density. However, the sluggish oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) result in high overpotential (∼1.5 V), poor rate capability, and even a short cycle life, which critically hinder their practical applications. Herein, we propose a synergistic strategy to boost the electrocatalytic activity of Co3O4nanosheets for Li-O2batteries by tuning the inner oxygen vacancies and the exterior Co3+/Co2+ratios, which have been identified by Raman spectroscopy, X-ray photoelectron spectroscopy, and X-ray absorption near edge structure spectroscopy. Operando Xray diffraction and ex situ scanning electron microscopy are used to probe the evolution of the discharge product. In comparison with bulk Co3O4, the cells catalyzed by Co3O4nanosheets show a much higher initial capacity (∼24051.2 mAh g-1), better rate capability (8683.3 mAh g-1@400 mA g-1) and cycling stability (150 cycles@400 mA g-1), and lower overpotential. The large enhancement in the electrochemical performances can be mainly attributed to the synergistic effect of the architectured 2D nanosheets, the oxygen vacancies, and Co3+/Co2+difference between the surface and the interior. Moreover, the addition of LiI to the electrolyte can further reduce the overpotential, making the battery more practical. This study offers some insights into designing highperformance electrocatalysts for Li-O2batteries through a combination of the 2D nanosheet architecture, oxygen vacancies, and surface electronic structure regulation.
Zhou, D, Jia, H, Rana, J, Placke, T, Scherb, T, Kloepsch, R, Schumacher, G, Winter, M & Banhart, J 2017, 'Local structural changes of nano-crystalline ZnFe2O4during lithiation and de-lithiation studied by X-ray absorption spectroscopy', Electrochimica Acta, vol. 246, pp. 699-706.View/Download from: UTS OPUS or Publisher's site
© 2017 Elsevier Ltd X-ray absorption spectroscopy was carried out to investigate local structural changes around Fe and Zn atoms of the nano-crystalline spinel ferrite ZnFe2O4anode material at various states-of-charge during the 1st and 2nd lithiation/de-lithiation. From the X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS), we propose a possible structure evolution process of the ZnFe2O4electrode during the 1st discharge and charge cycle. A mixture of metallic iron, ZnO, metallic zinc, LiZn and Li2O phases seem to be formed as the cell is firstly discharged to 0.02 V. Instead of the original ZnFe2O4spinel phase, the metallic iron and zinc particles are re-oxidized to Fe2O3and ZnO phases during the subsequent de-lithiation. A reversible redox reaction between Fe2O3, ZnO and lithium ions is found in the 2nd cycle. The formation of SEI layer in the initial cycles plays a major role in the irreversible capacity of the electrode. The inactive disordered ZnO formed due to the conversion reaction of ZnFe2O4during the 1st lithiation is probably the main reason for the poor electrochemical behavior of the nano-crystalline ZnFe2O4electrode.
Zhou, D, Liu, M, Yun, Q, Wang, X, He, Y-B, Li, B, Yang, Q-H, Cai, Q & Kang, F 2017, 'A Novel Lithiated Silicon-Sulfur Battery Exploiting an Optimized Solid-Like Electrolyte to Enhance Safety and Cycle Life.', Small, vol. 13, no. 3, pp. 1-8.View/Download from: UTS OPUS or Publisher's site
Anovel lithiated Si-S battery exploiting an optimized solid-like electrolyte is presented. This electrolyte is fabricated by integrating ether-based liquid electrolyte with SiO2 hollow nanosphere layer to suppress the shuttle effect and fluoroethylene carbonate additive to optimize the anodic solid electrolyte interface. The prepared lithiated Si-S batteries exhibit enhanced cycle life, low flammability, and strong recovery ability against short-circuit.
Zhou, D, Liu, R, Zhang, J, Qi, X, He, YB, Li, B, Yang, QH, Hu, YS & Kang, F 2017, 'In situ synthesis of hierarchical poly(ionic liquid)-based solid electrolytes for high-safety lithium-ion and sodium-ion batteries', Nano Energy, vol. 33, pp. 45-54.View/Download from: UTS OPUS or Publisher's site
© 2017 The rapid development of lithium (Li)-ion and sodium (Na)-ion batteries requires advanced solid electrolytes that possess both favorable electrochemical performance and safety assurance. Herein we report a hierarchical poly (ionic liquid)-based solid electrolyte (HPILSE) for high-safety Li-ion and Na-ion batteries. This hybrid solid electrolyte is fabricated via in situ polymerizing 1,4-bis[3-(2-acryloyloxyethyl)imidazolium-1-yl]butane bis[bis(trifluoromethanesulfonyl)imide] (C1-4TFSI) monomer in 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (EMITFSI)-based electrolyte which is filled in poly(diallyldimethylammonium) bis(trifluoromethanesulfonyl)imide (PDDATFSI) porous membrane. The well-designed hierarchical structure simultaneously provides the prepared HPILSE with high ionic conductivity ( > 10 −3 S cm −1 at 25 °C), satisfied electrochemical stability, inherent incombustibility, good mechanical strength and flexibility. More intriguingly, the in situ assembled LiFePO 4 /Li and Na 0.9 [Cu 0.22 Fe 0.30 Mn 0.48 ]O 2 /Na cells using HPILSE exhibit superior cycling performances with high specific capacities. Both the excellent performance of HPILSE and the simple fabricating process of HPILSE-based solid-state cells make it potentially as one of the most promising electrolyte materials for next generation Li-ion and Na-ion batteries.
Zhou, D, Permien, S, Rana, J, Krengel, M, Sun, F, Schumacher, G, Bensch, W & Banhart, J 2017, 'Investigation of electronic and local structural changes during lithium uptake and release of nano-crystalline NiFe2O4by X-ray absorption spectroscopy', Journal of Power Sources, vol. 342, pp. 56-63.View/Download from: UTS OPUS or Publisher's site
© 2016 Elsevier B.V. Nano-crystalline NiFe2O4particles were synthesized and used as active electrode material for a lithium ion battery that showed a high discharge capacity of 1534 mAh g−1and charge capacity of 1170 mAh g−1during the 1st cycle. X-ray absorption spectroscopy including XANES and EXAFS were used to investigate electronic and local structural changes of NiFe2O4during the 1st lithiation and de-lithiation process. As lithium is inserted into the structure, tetrahedral site Fe3+ions are reduced to Fe2+and moved from tetrahedral sites to empty octahedral sites, while Ni2+ions are unaffected. As a consequence, the matrix spinel structure collapses and transforms to an intermediate rock-salt monoxide phase. Meanwhile, the inserted Li is partially consumed by the formation of SEI and other side reactions during the conversion reaction. With further lithiation, the monoxide phase is reduced to highly disordered metallic Fe/Ni nanoparticles with a number of nearest neighbors of 6.0(8) and 8.1(4) for Fe and Ni, respectively. During subsequent de-lithiation, the metal particles are individually re-oxidized to Fe2O3and NiO phases instead to the original NiFe2O4spinel phase.
Li, Q, Liu, M, Qin, X, Wu, J, Han, W, Liang, G, Zhou, D, He, Y-B, Li, B & Kang, F 2016, 'Cyclized-polyacrylonitrile modified carbon nanofiber interlayers enabling strong trapping of polysulfides in lithium-sulfur batteries', JOURNAL OF MATERIALS CHEMISTRY A, vol. 4, no. 33, pp. 12973-12980.View/Download from: Publisher's site
Liu, H, Wang, J, Zhang, X, Zhou, D, Qi, X, Qiu, B, Fang, J, Kloepsch, R, Schumacher, G, Liu, Z & Li, J 2016, 'Morphological Evolution of High-Voltage Spinel LiNi0.5Mn1.5O4 Cathode Materials for Lithium-Ion Batteries: The Critical Effects of Surface Orientations and Particle Size', ACS Applied Materials and Interfaces, vol. 8, no. 7, pp. 4661-4675.View/Download from: Publisher's site
© 2016 American Chemical Society. An evolution panorama of morphology and surface orientation of high-voltage spinel LiNi0.5Mn1.5O4 cathode materials synthesized by the combination of the microwave-assisted hydrothermal technique and a postcalcination process is presented. Nanoparticles, octahedral and truncated octahedral particles with different preferential growth of surface orientations are obtained. The structures of different materials are studied by X-ray diffraction (XRD), Raman spectroscopy, X-ray absorption near edge spectroscopy (XANES), and transmission electron microscopy (TEM). The influence of various morphologies (including surface orientations and particle size) on kinetic parameters, such as electronic conductivity and Li+ diffusion coefficients, are investigated as well. Moreover, electrochemical measurements indicate that the morphological differences result in divergent rate capabilities and cycling performances. They reveal that appropriate surface-tailoring can satisfy simultaneously the compatibility of power capability and long cycle life. The morphology design for optimizing Li+ transport and interfacial stability is very important for high-voltage spinel material. Overall, the crystal chemistry, kinetics and electrochemical performance of the present study on various morphologies of LiNi0.5Mn1.5O4 spinel materials have implications for understanding the complex impacts of electrode interface and electrolyte and rational design of rechargeable electrode materials for lithium-ion batteries. The outstanding performance of our truncated octahedral LiNi0.5Mn1.5O4 materials makes them promising as cathode materials to develop long-life, high energy and high power lithium-ion batteries.
Liu, M, Jiang, HR, Ren, YX, Zhou, D, Kang, FY & Zhao, TS 2016, 'In-situ Fabrication of a Freestanding Acrylate-based Hierarchical Electrolyte for Lithium-sulfur Batteries', ELECTROCHIMICA ACTA, vol. 213, pp. 871-878.View/Download from: Publisher's site
Liu, M, Zhou, D, He, Y-B, Fu, Y, Qin, X, Miao, C, Du, H, Li, B, Yang, Q-H, Lin, Z, Zhao, TS & Kang, F 2016, 'Novel gel polymer electrolyte for high-performance lithium-sulfur batteries', NANO ENERGY, vol. 22, pp. 278-289.View/Download from: Publisher's site
Liu, M, Zhou, D, Jiang, HR, Ren, YX, Kang, FY & Zhao, TS 2016, 'A highly-safe lithium-ion sulfur polymer battery with SnO2 anode and acrylate-based gel polymer electrolyte', NANO ENERGY, vol. 28, pp. 97-105.View/Download from: Publisher's site
Wang, J, He, X, Zhou, D, Schappacher, F, Zhang, X, Liu, H, Stan, MC, Cao, X, Kloepsch, R, Sofy, MS, Schumacher, G & Li, J 2016, 'O3-type Na[Fe1/3Ni1/3Ti1/3]O2 cathode material for rechargeable sodium ion batteries', Journal of Materials Chemistry A, vol. 4, no. 9, pp. 3431-3437.View/Download from: Publisher's site
© The Royal Society of Chemistry 2016. A Na[Fe1/3Ni1/3Ti1/3]O2 cathode material for sodium-ion batteries has been synthesized by a solid-state reaction method. The obtained Na[Fe1/3Ni1/3Ti1/3]O2 shows an O3-type structure, and delivers a discharge capacity of 117 mA h g-1 at a current density of 10 mA g-1 in a range of 1.5-4.0 V at 20 °C. Furthermore, the Na[Fe1/3Ni1/3Ti1/3]O2 cathode material shows good rate capability and cycling stability. The working and structural transition mechanisms of the Na[Fe1/3Ni1/3Ti1/3]O2 material are examined by ex situ X-ray absorption spectroscopy (XAS) and in situ X-ray diffraction (XRD) methods. The valence state of Fe ions in the Na[Fe1/3Ni1/3Ti1/3]O2 material is estimated to be 2.67+. The main redox couple is Ni2+/Ni4+, but the Fe2+/Fe3+ contributes a little as well at voltages below 2.0 V. The original O3 phase transforms to a P3 phase during sodium extraction with good reversibility, but a slightly irreversible change of lattice parameters may lead to capacity decay during long-term cycling. Moreover, the gas evolution during the first charge/discharge process is analyzed by using an operando mass spectrometry technique. The obvious release of CO2 gas at the end of the charge process may be the other origin of the capacity decay. Nevertheless, the absence of O2 evolution indicates an improved safety of the Na/Na[Fe1/3Ni1/3Ti1/3]O2 cell.
Wu, J, Qin, X, Miao, C, He, Y-B, Liang, G, Zhou, D, Liu, M, Han, C, Li, B & Kang, F 2016, 'A honeycomb-cobweb inspired hierarchical core-shell structure design for electrospun silicon/carbon fibers as lithium-ion battery anodes', CARBON, vol. 98, pp. 582-591.View/Download from: Publisher's site
Zhou, D, Jia, H, Rana, J, Placke, T, Klöpsch, R, Schumacher, G, Winter, M & Banhart, J 2016, 'Investigation of a porous NiSi2/Si composite anode material used for lithium-ion batteries by X-ray absorption spectroscopy', Journal of Power Sources, vol. 324, pp. 830-835.View/Download from: Publisher's site
© 2016 Elsevier B.V. Local structural changes in a porous NiSi2/Si composite anode material are investigated by X-ray absorption spectroscopy. It is observed that the NiSi2 phase shows a strong metal-metal bond character and no clear changes can be observed in XANES during lithiation and de-lithiation. The variation of the number of nearest neighbors of the Ni atom for the 1st coordinate Ni-Si shell and σ2 in the 1st cycle, both determined by refinement, demonstrates that NiSi2 can partially react with lithium during discharge and charge. A partially reversible non-stoichiometric compound NiSi2−y is formed during cell operation, the crystal structure of which is the same as that of the NiSi2 phase. It can be concluded that NiSi2 in the composite not only accommodates the pronounced volume changes caused by the lithium uptake into silicon, but also contributes to the reversible capacity of the cell.
Zhou, D, Liu, R, He, Y-B, Li, F, Liu, M, Li, B, Yang, Q-H, Cai, Q & Kang, F 2016, 'SiO2 Hollow Nanosphere-Based Composite Solid Electrolyte for Lithium Metal Batteries to Suppress Lithium Dendrite Growth and Enhance Cycle Life', ADVANCED ENERGY MATERIALS, vol. 6, no. 7.View/Download from: Publisher's site
Li, F, Shi, W, Zhou, D, Liu, R, Xia, Y, Li, B, Chen, B & Cai, Q 2015, 'Synthesis and Characterization of a Cyclic Polyacetonitril Oligomer and its Application on Solid Polymer Electrolyte', INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE, vol. 10, no. 7, pp. 5561-5575.
Zhou, D, He, Y-B, Liu, R, Liu, M, Du, H, Li, B, Cai, Q, Yang, Q-H & Kang, F 2015, 'In Situ Synthesis of a Hierarchical All-Solid-State Electrolyte Based on Nitrile Materials for High-Performance Lithium-Ion Batteries', ADVANCED ENERGY MATERIALS, vol. 5, no. 15.View/Download from: Publisher's site
Zhou, D, He, Y-B, Cai, Q, Qin, X, Li, B, Du, H, Yang, Q-H & Kang, F 2014, 'Investigation of cyano resin-based gel polymer electrolyte: in situ gelation mechanism and electrode-electrolyte interfacial fabrication in lithium-ion battery', JOURNAL OF MATERIALS CHEMISTRY A, vol. 2, no. 47, pp. 20059-20066.View/Download from: Publisher's site
Fan, H, Zhou, D, Fan, L & Shi, Q 2013, 'Development on in-situ synthesis of gel polymer electrolyte for lithium batteries', Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society, vol. 41, no. 2, pp. 134-139.View/Download from: Publisher's site
Lithium-ion batteries with a high energy density are developed for future energy storage devices. Recent works focus on gel polymer electrolyte with easily shaped properties due to its effective solution to the security problem caused by liquid electrolyte leakage. This paper reviews the in-situ polymerization technology, which has increasingly attractive attentions in the preparation process of gel polymer electrolyte. Moreover, this paper represents the reaction principle, process route and influencing factors on the product performance in some detail, and also prospects the in-situ polymerization process development as a promising lithium-ion battery production technology.