Realizing long-cycling all-solid-state Li-In||TiS2 batteries using Li6+xMxAs1-xS5I (M=Si, Sn) sulfide solid electrolytes
Pushun Lu, Yu Xia, Guochen Sun, Dengxu Wu, Siyuan Wu, Wenlin Yan, Xiang Zhu, Jiaze Lu, Quanhai Niu, Shaochen Shi, Zhengju Sha, Liquan Chen, Hong Li, Fan Wu
Abstract
Abstract Inorganic sulfide solid-state electrolytes, especially Li 6 PS 5 X (X = Cl, Br, I), are considered viable materials for developing all-solid-state batteries because of their high ionic conductivity and low cost. However, this class of solid-state electrolytes suffers from structural and chemical instability in humid air environments and a lack of compatibility with layered oxide positive electrode active materials. To circumvent these issues, here, we propose Li 6+x M x As 1-x S 5 I (M=Si, Sn) as sulfide solid electrolytes. When the Li 6+x Si x As 1-x S 5 I (x = 0.8) is tested in combination with a Li-In negative electrode and Ti 2 S-based positive electrode at 30 °C and 30 MPa, the Li-ion lab-scale Swagelok cells demonstrate long cycle life of almost 62500 cycles at 2.44 mA cm −2 , decent power performance (up to 24.45 mA cm −2 ) and areal capacity of 9.26 mAh cm −2 at 0.53 mA cm −2 .