期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 18, 页码 4960-4964出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201611122
关键词
hydroperoxide; Li-O-2 battery; superoxide; water additive
资金
- Advanced Low Carbon Technology Research and Development Program (ALCA)
- National Basic Research Program of China [2014CB932300]
- NSF of China [21373111]
The development of aprotic Li-O-2 batteries, which are promising candidates for high gravimetric energy storage devices, is severely limited by superoxide-related parasitic reactions and large voltage hysteresis. The fundamental reaction pathway of the aprotic Li-O-2 battery can be altered by the addition of water, which changes the discharge intermediate from superoxide (O-2(-)) to hydroperoxide (HO2-). The new mechanism involving HO2- intermediate realizes the two-electron transfer through a single step, which significantly suppresses the superoxide-related side reactions. Moreover, addition of water also triggers a solution-based pathway that effectively reduces the voltage hysteresis. These discoveries offer a possible solution for desirable Li-O-2 batteries free of aggressive superoxide species, highlighting the design strategy of modifying the reaction pathway for Li-O-2 electrochemistry.
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