期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 70, 期 -, 页码 43-46出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2016.07.001
关键词
Lithium air; Lithium oxygen; Restacking; Volume expansion; Reduced graphene oxide; Thermal treatment
资金
- NSF MRSEC program [DMR-1120296]
- Nanobiotechnology Center
- Axium Nanofibers [68678]
- Dongjin Semichem (CCMR ICP) [M01-9122]
Poor rechargeability is one of major drawbacks of lithium-air batteries. Our study reveals that the accumulation and subsequent removal of reaction products during cycles can lead to a serious disruption and volume expansion of the cathode structure and demonstrates that by restacking and realigning the three phase interface of the cycled cathodes via mild heat treatment results in the enhanced cycle performance by over 200% and reduces the discharge overpotential at the same time. The results stress the importance of maintaining the physical configuration of lithium-air cathodes, and provide a new insight towards pulling out capacity retention of the system by better utilization of the available carbon surface. (C) 2016 Elsevier B.V. All rights reserved.
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