Redox mediator assists electron transfer in lithium–sulfur batteries with sulfurized polyacrylonitrile cathodes

EcoMat

Tongqi Yuan¹  Qiang Zhang²  Jia‐Ning Liu²  Yun‐Wei Song²  Wei‐Jing Chen²  Chang‐Xin Zhao²  Cheng‐Meng Chen³  Meng Zhao⁴  Jia‐Qi Huang⁴  Bo‐Quan Li⁴ 

[1] Beijing Advanced Innovation Center for Tree Breeding by Molecular Design Beijing Forestry University Beijing China;Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering Tsinghua University Beijing China;CAS Key Laboratory of Carbon Materials Institute of Coal Chemistry, Chinese Academy of Sciences Taiyuan Shanxi China;School of Materials Science and Engineering Beijing Institute of Technology Beijing China;

关键词: electron transfer;    energy storage;    lithium–sulfur batteries;    redox mediator;    sulfurized polyacrylonitrile;   

DOI  :  10.1002/eom2.12066

来源: DOAJ

【 摘 要 】

Abstract The development of next‐generation high‐energy‐density batteries requires advanced electrode materials. Sulfurized polyacrylonitrile (SPAN) is considered a promising sulfur cathode with the merits of high specific capacity and long cycling stability for high‐performance lithium–sulfur (Li–S) batteries. Nevertheless, the practical performances of SPAN cathodes are severely limited by the unfavorable electron accessibility due to the relatively low intrinsic conductivity and large particle size. Herein, a redox mediation strategy is proposed to accelerate the electron transfer processes in working Li–S batteries with SPAN cathodes. Specifically, a quinone‐based redox mediator is introduced to provide an additional redox pathway with strengthened interfacial kinetics. The redox mediator assisted SPAN cathodes exhibit higher specific capacity, improved rate performance, reduced polarization, and longer cycling lifespan with both ether‐based and carbonate‐based electrolyte. This work demonstrates the feasibility of redox mediation to promote the electron accessibility for high‐performance Li–S batteries with SPAN cathodes.

【 授权许可】

Unknown