Two-dimensional layered transition metal disulphides for effective encapsulation of high-capacity lithium sulphide cathodes

Zhi Wei Seh, Jung Ho Yu, Weiyang Li, Po-Chun Hsu, Haotian Wang, Yongming Sun, Hongbin Yao, Qianfan Zhang () and Yi Cui ()
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Zhi Wei Seh: Stanford University
Jung Ho Yu: Stanford University
Weiyang Li: Stanford University
Po-Chun Hsu: Stanford University
Haotian Wang: Stanford University
Yongming Sun: Stanford University
Hongbin Yao: Stanford University
Qianfan Zhang: School of Materials Science and Engineering, Beihang University
Yi Cui: Stanford University

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract 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 503mAhg -1 Li 2 S under high C-rate conditions (4C) as well as high areal capacity of 3.0 mAh cm−2 under high mass-loading conditions ( 5 .3mg Li 2 S cm -2 ). This work opens up the new prospect of using transition metal disulphides instead of conventional carbon-based materials for effective encapsulation of high-capacity electrode materials.

Date: 2014
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DOI: 10.1038/ncomms6017

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