Synthesis and electrochemical performance of (100-x)Li7P3S11-xLi2OHBr composite solid electrolyte for all-solid-state lithium batteries

• 作者: Kwang-Sun Ryu Rajesh Rajagopal Su-Yeon Jung
• 来源期刊: 能源化学
• 年，卷（期）: 2020,（8）
• 页码范围: 307-316
• 页数: 10页
• 语种: 英文

摘要

Li7P3S11 solid electrolytes with high lithium-ion conductivity are promising candidates for use in all-solidstate lithium batteries.However,this electrolyte's poor interfacial compatibility with lithium electrodes causes unstable cyclability.In this study,in order to address this problem,(100-x)Li7P3S11-xLi2OHBr (x =0,2,5,10,20,30,40,and 50) electrolytes are prepared by a high energy ball-milling technique and heat-treatment process.The resulting (100-x)Li7P3S11-xLi2OHBr (x =2,5,10,20,30,40,and 50) electrolytes provide improved electrochemical performance with good cycling stability and a wide electrochemical window of up to 10 V (vs.Li/Li+).Moreover,these electrolytes have high ionic conductivity of 10 4-10-5 S/cm at room temperature.Particularly,the 90Li7P3S11-10Li2OHBr electrolyte displays the highest conductivity of 4.4 × 10-4 S/cm at room temperature as well as improved cyclability.Moreover,90Li7P3S11-10Li2OHBr shows decreased interfacial resistance between the solid electrolyte and cathode electrode,which was revealed by Electrochemical Impedance Spectroscopy (EIS) analysis.The initial discharge capacity of 90Li7P3S11-10Li2OHBr was found to be 135 mAh/g when used in a In|solid electrolyte|Li(Ni0.6Co0.2Mn02)O2 all-solid-state lithium battery (ASSLB).Thus,we can conclude the addition of Li2OHBr into the Li7P3S11 results in enhanced electrochemical properties.