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

作者机构：School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary ScienceBeijing Institute of TechnologyBeijing 100081China 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2023年第82卷第7期

页      面：507-512,I0011页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

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。 

主　　题：Lithium-sulfur batteries Lithium polysulfides Liquid-solid deposition Supersaturation 

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.