Influences of chemical reactions on polysulfide reduction reaction process on promotor surface in Li-S batteries  

作　　者：Yufeng Luo Zhenhan Fang Zixin Hong Shaorong Duan Haitao Liu Hengcai Wu Qunqing Li Yuegang Zhang Shoushan Fan Wenhui Duan Jiaping Wang 

机构地区：[1]Tsinghua-Foxconn Nanotechnology Research Center,Tsinghua University,Beijing 100084,China [2]Department of Physics,Tsinghua University,Beijing 100084,China [3]Laboratory of Computational Physics,Institute of Applied Physics and Computational Mathematics,Beijing 100088,China [4]Frontier Science Center for Quantum Information,Tsinghua University,Beijing 100084,China

出　　处：《Nano Research》2024年第4期2712-2718,共7页纳米研究（英文版）

基　　金：supported by the National Basic Research Program of China(2019YFA0705702);the National Natural Science Foundation of China(51872158);.H.T.Liu acknowledges funding from the National Natural Science Foundation of China(No.11734013,11874089).

摘　　要：Polar promotors have been proven effective in catalyzing the polysulfide(PS)reduction reaction(PSRR)process in lithium-sulfur(Li-S)batteries.However,the promotor surface tends to be poisoned due to the accumulation of insoluble discharging products of lithium disulfide(Li_(2)S_(2))and lithium sulfide(Li_(2)S)during Li-S battery operation.Herein,we investigate the detailed PSRR mechanism on the surface of manganese sulfides(MnS)as a representative promoter by performing in-situ Raman mapping measurements.The catalytic ability of MnS enables thorough electrochemical reduction of PSs to Li_(2)S_(2) and Li_(2)S on the MnS surface.The generated Li_(2)S_(2) and Li_(2)S then adsorb the dissolved PSs via chemical reactions among sulfur species during the subsequent PSRR process.This phenomenon mitigates promotor poisoning and continuously improves the reversible capacity.Consequently,the assembled Li-S cell demonstrates excellent electrochemical performance after introducing a conductive interlayer containing a thin piece of carbon nanotube film and MnS promotors.

关 键 词：promotors POLYSULFIDES chemical reactions catalytic ability in-situ Raman measurements 

分 类 号：O64[理学—物理化学]