期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 51, 页码 15835-15839出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201608730
关键词
AFM; electrochemistry; interfacial dynamics; Li-S batteries; nanostructures
资金
- National Key Research and Development Program of China [2016YBF0100100]
- Hundred Talents Program from the Chinese Academy of Sciences
Lithium-sulfur (Li-S) batteries are highly appealing for large-scale energy storage. However, performance deterioration issues remain, which are highly related to interfacial properties. Herein, we present a direct visualization of the interfacial structure and dynamics of the Li-S discharge/charge processes at the nanoscale. In situ atomic force microscopy and ex situ spectroscopic methods directly distinguish the morphology and growth processes of insoluble products Li2S2 and Li2S. The monitored interfacial dynamics show that Li2S2 nanoparticle nuclei begin to grow at 2V followed by a fast deposition of lamellar Li2S at 1.83V on discharge. Upon charging, only Li2S depletes from the interface, leaving some Li2S2 undissolved, which accumulates during cycling. The galvanostatic precipitation of Li2S2 and/or Li2S is correlated to current rates and affects the specific capacity. These findings reveal a straightforward structure-reactivity correlation and performance fading mechanism in Li-S batteries.
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