LiTFSI salt concentration effect to digest lithium polysulfides for high-loading sulfur electrodes  

作　　者：Jin-Kwang Song Moonsoo Kim Seongbae Park Young-Jun Kim 

机构地区：[1]SKKU Advanced Institute of Nano Technology(SAINT),Sungkyunkwan University,Suwon 16419,Republic of Korea [2]Department of Nano Engineering,Sungkyunkwan University,Suwon 16419,Republic of Korea

出　　处：《Journal of Energy Chemistry》2023年第3期574-581,I0015,共9页能源化学（英文版）

基　　金：supported by a grant from the Korea Evaluation Institute of Industrial Technology(KEIT)funded by the Ministry of Trade,Industry and Energy(MOTIE)(No.20012341)。

摘　　要：Sulfur utilization improvement and control of dissolved lithium polysulfide(LiPS;Li_(2)S x,2<x≤8)are cru-cial aspects of the development of lithium-sulfur(Li-S)batteries,especially in high-loading sulfur elec-trodes and low electrolyte/sulfur(E/S)ratios.The sluggish reaction in the low E/S ratio induces poor LiPS solubility and unstable Li_(2)S electrodeposition,resulting in limited sulfur utilization,especially under high-loading sulfur electrode.In this study,we report on salt concentration effects that improve sulfur utilization with a high-loading cathode(6 mgs ulfurcm^(-2)),a high sulfur content(80 wt%)and a low E/S ratio(5 m L gs ulfur^(-1)).On the basis of the rapid LiPS dissolving in a low concentration electrolyte,we estab-lished that the quantity of Li_(2)S electrodeposition from a high Li+diffusion coefficient,referring to the reduction of LiPS precipitation,was significantly enhanced by a faster kinetic.These results demonstrate the importance of kinetic factors for the rate capability and cycle life stability of Li-S battery electrolytes through high Li_(2)S deposition under high-loading sulfur electrode.

关 键 词：Lithium-sulfur battery Electrolyte concentration Li2S deposition High-loading sulfur electrode 

分 类 号：TM912[电气工程—电力电子与电力传动] O646[理学—物理化学]