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

Zhuoran Zhang,Jianxing Zhang,Yulong Sun,Huanhuan Jia,Linfeng Peng,Yunyang Zhang,Jia Xie

The sulfide solid electrolytes have the characteristics of high ionic conductivity and low grain boundary 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 Li 4 SnS 4 -Li 3 SbS 4 system. The solid solutions of Li 4– x Sb x Sn 1– x S 4 (0 ≤  x  ≤ 0.5) can be formed in Li 4 SnS 4 -Li 3 SbS 4 system. Li 3.8 Sb 0.2 Sn 0.8 S 4 achieves the highest ionic conductivity of 3.5 × 10 −4  S cm −1 in this system, which is 5 times as that of Li 4 SnS 4 and 3 orders of magnitude higher than that of Li 3 SbS 4 , respectively. Li 3.8 Sb 0.2 Sn 0.8 S 4 crystallizes into the same structure with high ionic conductivity phase of β -Li 3 PS 4 . Moreover, Li 3.8 Sb 0.2 Sn 0.8 S 4 owns good stability in humid air . Matching with LiCoO 2 and Li 4 Ti 5 O 12 , Li 3.8 Sb 0.2 Sn 0.8 S 4 exhibits the potential to be applied in all-solid-state batteries.