Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 10, Issue 10, Pages 2182-2189Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201500355
Keywords
cyclability; electrolyte decomposition; lithium-oxygen battery; oxygen evolution reaction; safe potential window
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Funding
- SERC Advanced Energy Storage Research Programme [IMRE/12-2P0504]
- Institute of Material Research and Engineering (IMRE), A*STAR, Singapore
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With new chemistry and advantageous configuration, the lithium-oxygen (Li-O-2) battery promises a much higher specific energy than traditional lithium-ion batteries. The limited understanding on the complicated battery reactions therein, however, has become a major bottleneck of its development for applications requiring a high energy efficiency and long cycle-life. Herein, in a confined potential window with negligible electrolyte degradation, we studied the rechargeability of Li-O-2 cathodes with pre-filled well-de-fined discharge products of Li2O2, Li2CO3, LiOH, or their combinations. Our results suggest Li2CO3 as the most difficult species to be electrochemically decomposed among the three lithium compounds, whereas the presence of LiOH notably increases the initial charge potential. The clearly visible difference in the charge behavior and cycling stability of these artificially discharged electrodes provides a guideline for the development of future high-performance Li-O-2 batteries.
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