Authors
Zhi Wei Seh, Jung Ho Yu, Weiyang Li, Po-Chun Hsu, Haotian Wang, Yongming Sun, Hongbin Yao, Qianfan Zhang, Yi Cui
Publication date
2014/9/25
Journal
Nature communications
Volume
5
Issue
1
Pages
5017
Publisher
Nature Publishing Group UK
Description
Fully lithiated lithium sulphide (Li2S) is currently being explored as a promising cathode material for emerging energy storage applications. Like their sulphur counterparts, Li2S cathodes require effective encapsulation to reduce the dissolution of intermediate lithium polysulphide (Li2Sn, n=4–8) species into the electrolyte. Here we report, the encapsulation of Li2S cathodes using two-dimensional layered transition metal disulphides that possess a combination of high conductivity and strong binding with Li2S/Li2Sn species. In particular, using titanium disulphide as an encapsulation material, we demonstrate a high specific capacity of under high C-rate conditions (4C) as well as high areal capacity of 3.0 mAh cm−2 under high mass-loading conditions (). This work opens up the new prospect of using transition metal disulphides instead of conventional carbon-based materials for effective …
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