Li4-xSbxSn1-xS4 solid solutions for air-stable solid electrolytes

• 作 者: Zhuoran Zhang Jianxing Zhang Yulong Sun Huanhuan Jia Linfeng Peng Yunyang Zhang Jia Xie
• 机 构: State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and
• 出 处: 能源化学
• 发表日期: 2020年2期
• 关键词: Solid electrolyte Air stable sulfide Li4SnS4 β-Li3PS4 All-solid-state battery

The sulfide solid electrolytes have the characteristics of high ionic conductivity and low grain bound-ary resistance,which make them suitable for bulk-type all-solid-state batteries.However,most of them suffer from poor stability in air.Here,we explore the air stable sulfide solid electrolytes in Li4SnS4-Li3SbS4 system.The solid solutions of Li4-xSbxSn1-xS4(0≤x≤0.5)can be formed in Li4SnS4-Li3SbS4 system.Li3.8Sb0.2Sn0.8S4 achieves the highest ionic conductivity of 3.5×10-4 Scm-1 in this system,which is 5 times as that of Li4SnS4 and 3 orders of magnitude higher than that of Li3SbS4,respec-tively.Li3.8Sb0.2Sn0.8S4 crystallizes into the same structure with high ionic conductivity phase of β-Li3PS4.Moreover,Li3.8Sb0.2Sn0.8S4 owns good stability in humid air.Matching with LiCoO2 and Li4Ti5O12,Li3.8Sb0.2Sn0.8S4 exhibits the potential to be applied in all-solid-state batteries.