期刊
ADVANCED MATERIALS
卷 31, 期 25, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201901220
关键词
amorphous cobalt sulfide; catalytic effect; high loading; high utilization; lithium-sulfur batteries
类别
资金
- Natural Science and Engineering Research Council of Canada (NSERC)
- Canada Research Chair Program (CRC)
- Canada Foundation for Innovation (CFI)
- University of Western Ontario (UWO)
- National Natural Science Foundation of China [51403209, 51677176, 51673199, 21406221, 51177156/E0712]
- Youth Innovation Promotion Association [2015148]
- Natural Sciences Foundation of Liaoning Province of China [2013020126]
- Youth Innovation Foundation of Dalian Institute of Chemical Physics [201307]
- Bundesministerium fur Bildung und Forschung (BMBF)
- Gauss Centre for Supercomputing e.V.
- Chinese Scholarship Council
Lithium-sulfur (Li-S) batteries with high sulfur loading are urgently required in order to take advantage of their high theoretical energy density. Ether-based Li-S batteries involve sophisticated multistep solid-liquid-solid-solid electrochemical reaction mechanisms. Recently, studies on Li-S batteries have widely focused on the initial solid (sulfur)-liquid (soluble polysulfide)-solid (Li2S2) conversion reactions, which contribute to the first 50% of the theoretical capacity of the Li-S batteries. Nonetheless, the sluggish kinetics of the solid-solid conversion from solid-state intermediate product Li2S2 to the final discharge product Li2S (corresponding to the last 50% of the theoretical capacity) leads to the premature end of discharge, resulting in low discharge capacity output and low sulfur utilization. To tackle the aforementioned issue, a catalyst of amorphous cobalt sulfide (CoS3) is proposed to decrease the dissociation energy of Li2S2 and propel the electrochemical transformation of Li2S2 to Li2S. The CoS3 catalyst plays a critical role in improving the sulfur utilization, especially in high-loading sulfur cathodes (3-10 mg cm(-2)). Accordingly, the Li2S/Li2S2 ratio in the discharge products increased to 5.60/1 from 1/1.63 with CoS3 catalyst, resulting in a sulfur utilization increase of 20% (335 mAh g(-1)) compared to the counterpart sulfur electrode without CoS3.
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