文献类型：期刊文献

英文题名：A facile electrochemical strategy for engineering sulfur deficiencies of CdS nanosheets to promote the catalytic conversion of polysulfides for lithium-sulfur batteries

作者：Li, Yangping[1];Niu, Dongfang[1];Fu, Xingyan[1];Zhang, Zhiliang[1];Zhang, Xinsheng[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2021

卷号：5

期号：3

起止页码：678

外文期刊名：SUSTAINABLE ENERGY & FUELS

收录：;EI(收录号：20210709914679);WOS:【SCI-EXPANDED(收录号:WOS:000616375400004)】；

基金：We acknowledge the Student's Platform for Innovation and Entrepreneurship Training Program (No. X20005).

语种：英文

外文关键词：Nanosheets - Surface defects - Separators - Lithium sulfur batteries - Cost effectiveness - Energy storage - Graphene - II-VI semiconductors - Decay (organic) - Electrocatalysis

摘要：Rechargeable lithium-sulfur batteries (LSBs) are regarded as one of the most promising next-generation energy storage systems for their high energy density and low-cost. However, the severe shuttle effect and the sluggish kinetics of polysulfides significantly hinder the practical application of LSBs. Most notably, surface defects of catalysts (typically anion deficiencies) have been fabricated via metal doping, hydrogen treatment and plasma engraving, in order to effectively enhance the chemisorption and electrocatalysis of polysulfides. However, these methods are complicated, have high costs and suffer from difficulties in scaling up. Herein, we present a facile and cost-effective strategy via electroreduction treatment to fabricate sulfur deficiencies applied to a CdS nanosheet/reduced graphene oxide (CdS NSs/rGO) composite, which serves as the functional separator to promote the catalytic interconversion of polysulfides for LSBs. The cell with the CdS1-x NSs/rGO functional separator not only exhibits a high initial rate performance of 1415.9 mA h g(-1) at 0.2C, but it also delivers an excellent cycling stability with a decay rate of 0.066% after 1000 cycles at 1C. This work provides a new perspective on engineering sulfur deficiencies in energy storage systems through electrochemical technology.