期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 105, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2019.106491
关键词
Li-ion battery; Cathode; Annealing; Structural disorder
资金
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE) program under BMR award [DE-EE0006852]
- NorthEast Center for Chemical Energy Storage (NECCES), an Energy Frontier Research Center
- DOE Office of Science [DE-AC02-06CH11357]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0012583]
- EPSRC [EP/P003532/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/P003532/1] Funding Source: researchfish
epsilon-LiVOPO4, a multi-electron cathode material for Li-ion batteries, suffers from structural disorder upon nanosizing by high-energy ball-milling, which impedes kinetics and promotes undesirable interfacial side reactions. This work presents a feasible way to decrease the disorder in the ball-milled composite of epsilon-LiVOPO4/C by post-annealing at 450 degrees C in an Ar atmosphere, with no reduction reaction caused by carbon and no particle growth. The post-annealed material shows recovered voltage plateaus, enhanced kinetics of Li diffusivity, and suppressed interfacial reactions. As a result, a high-performance solid-state synthesized epsilon-LiVOPO4 can be obtained, delivering a capacity of 270 mAh g(-1) at C/5 with less than 4% degradation upon 100 cycles.
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