Enhanced catalysis of radical-to-polysulfide interconversion via increased sulfur vacancies in lithium–sulfur batteries. Issue 21 (16th May 2022)

• Record Type: Journal Article
• Authors: Xu, Rui; Tang, Hongan; Zhou, Yuanyuan; Wang, Fangzheng; Wang, Hongrui; Shao, Minhua; Li, Cunpu; Wei, Zidong
• Is Part Of: Chemical science. Volume 13:Issue 21(2022)
• Page Start: 6224
• Page End: 6232
• Publication Date: 2022-05-16
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2sc01353c
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : Sulfur vacancies can harmonize chemisorption and generate amounts of radicals to boost the conversions of LiPSs. Abstract : The practical application of lithium–sulfur (Li–S) batteries is seriously hindered by severe lithium polysulfide (LiPS) shuttling and sluggish electrochemical conversions. Herein, the Co9 S8 /MoS2 heterojunction as a model cathode host material is employed to discuss the performance improvement strategy and elucidate the catalytic mechanism. The introduction of sulfur vacancies can harmonize the chemisorption of the heterojunction component. Also, sulfur vacancies induce the generation of radicals, which participate in a liquidus disproportionated reaction to reduce the accumulation of liquid LiPSs. To assess the conversion efficiency from liquid LiPSs to solid Li2 S, a new descriptor calculated from basic cyclic voltammetry curves, nucleation transformation ratio, is proposed.