Air‐Stable Li2S Cathodes Enabled by an In Situ‐Formed Li+ Conductor for Graphite‐Li2S Pouch Cells

Author:

Qi Xiaoqun1,Jin Xiaoyu1,Xu Henghui1,Pan Yujun1,Yang Fengyi1,Zhu Zhenglu1,Ji Jie1,Jiang Ruining1,Du Haoran1,Ji Yongsheng1,Yang Dan1,Qie Long1ORCID,Huang Yunhui1

Affiliation:

1. State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 China

Abstract

AbstractUsing Li2S cathodes instead of S cathodes presents an opportunity to pair them with Li‐free anodes (e.g., graphite), thereby circumventing anode‐related issues, such as poor reversibility and safety, encountered in Li‐S batteries. However, the moisture‐sensitive nature of Li2S causes the release of hazardous H2S and the formation of insulative by‐products, increasing the manufacturing difficulty and adversely affecting cathode performance. Here, Li4SnS4, a Li+ conductor that is air‐stable according to the hard–soft acid–base principle, is formed in situ and uniformly on Li2S particles because Li2S itself participates in Li4SnS4 formation. When exposed to air (20% relative humidity), the protective Li4SnS4 layer maintains its components and structure, thus contributing to the enhanced stability of the Li2S@Li4SnS4 composite. In addition, the Li4SnS4 layer can accelerate the sluggish conversion of Li2S because of its favorable interfacial charge transfer, and continuously confine lithium polysulfides owing to its integrity during electrochemical processes. A graphite‐Li2S pouch cell containing a Li2S@Li4SnS4 cathode is constructed, which shows stable cyclability with 97% capacity retention after 100 cycles. Hence, combining a desirable air‐stable Li2S cathode and a highly reversible Li‐free configuration offers potential practical applications of graphite‐Li2S full cells.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Fundamental Research Funds for the Central Universities

Publisher

Wiley

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

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