Premature deposition of lithium polysulfide in lithium-sulfur batteries  

作　　者：Zi-Xian Chen Yu-Tong Zhang Chen-Xi Bi Meng Zhao Rui Zhang Bo-Quan Li Jia-Qi Huang 

机构地区：[1]School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [2]Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Journal of Energy Chemistry》2023年第7期507-512,I0011,共7页能源化学（英文版）

基　　金：supported by the National Key Research and Development Program(2021YFB2400300);the Beijing Natural Science Foundation(JQ20004);the National Natural Science Foundation of China(22109007,22109011);the Beijing Institute of Technology Research Fund Program for Young Scholars。

摘　　要：Lithium-sulfur(Li-S)batteries have attracted extensive attention due to ultrahigh theoretical energy density of 2600 Wh kg^(-1).Liquid-solid deposition from dissolved lithium polysulfides(LiPSs)to solid lithium sulfide(Li_(2)S)largely determines the actual battery performances.Herein,a premature liquidsolid deposition process of LiPSs is revealed at higher thermodynamic potential than Li_(2)S deposition in Li-S batteries.The premature solid deposit exhibits higher chemical state and hemispherical morphology in comparison with Li_(2)S,and the premature deposition process is slower in kinetics and higher in deposition dimension.Accordingly,a supersaturation deposition mechanism is proposed to rationalize the above findings based on thermodynamic simulation.This work demonstrates a unique premature liquid-solid deposition process of Li-S batteries.

关 键 词：Lithium-sulfur batteries Lithium polysulfides Liquid-solid deposition SUPERSATURATION 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ131.11[化学工程—无机化工]