Indexed by: Journal paper

Journal: Scripta Materialia

Included Journals: SCI

Affiliation of Author(s): 华中科技大学电气与电子工程学院

Place of Publication: 荷兰

Discipline: Engineering

First-Level Discipline: Material Science and Engineering

Document Type: J

Volume: 226

Page Number: 115219-115225

Key Words: Li6PS5I Ionic conductivity Sn-Cl dual doping Solid-state batteries Electrochemical performances

DOI number: 10.1016/j.scriptamat.2022.115219

Impact Factor: 6.302

Teaching and Research Group: 电力系

Abstract: The low Li-ion conductivity and poor interfacial compatibility towards cathode/anode materials of Li6PS5I solid electrolytes have significantly impeded their applications in all-solid-state batteries. This work developed a facial design strategy to improve the ionic conductivity and lithium metal compatibility of Li6PS5I electrolyte by the Sn-Cl dual doping. The optimal Li6.6P0.8Sn0.2S5I0.6Cl0.4 electrolyte shows ultrahigh conductivity up to 0.96 mS/c and enhanced lithium metal compatibility. The assembled battery using LiNi0.6Mn0.2Co0.2O2 cathode and Li-In anode delivers a high initial discharge capacity of 175.7 mAh/g at 0.1C and maintains 79.2% after 100 cycles. Moreover, the corresponding battery using lithium metal anode displays a higher initial capacity (137.7 mAh/g vs. 112.7 mAh/g) and superior cyclability. The superior battery performances are attributed to the smaller interfacial resistances of those solid electrolyte-involved interfaces due to the Sn-Cl dual doping. This work demonstrates that the dual doping strategy is an effective route to exploring highly conductive Li6PS5I electrolytes.