Realizing long-cycling all-solid-state Li-In||TiS₂ batteries using Li_6+xM_xAs_1-xS₅I (M=Si, Sn) sulfide solid electrolytes

PS Lu and Y Xia and GC Sun and DX Wu and SY Wu and WL Yan and X Zhu and JZ Lu and QH Niu and SC Shi and ZJ Sha and LQ Chen and H Li and F Wu, NATURE COMMUNICATIONS, 14 (2023).

DOI: 10.1038/s41467-023-39686-w

Inorganic sulfide solid-state electrolytes, especially Li6PS5X (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 Li6+xMxAs1-xS5I (M=Si, Sn) as sulfide solid electrolytes. When the Li6+xSixAs1-xS5I (x = 0.8) is tested in combination with a Li-In negative electrode and Ti2S-based positive electrode at 30 & DEG;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). Stable inorganic solid-state electrolytes are crucial for reliable all-solid-state battery development. Here, the authors report a Li- In|Li6.8Si0.8As0.2S5I|Ti2S lab-scale cell with a long cycle life of almost 62500 cycles at 2.44 mA cm(-2), 30 & DEG;C and 30 MPa.

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