Sn-O dual-doped Li-argyrodite electrolytes with enhanced electrochemical performance

As a type of candidate for all-solid-state Li batteries, argyrodite solid electrolytes possess high ionic conductivity, but poor compatibility against Li metal. Here, we report novel Li6PS5I-based argyrodite sulfides with Sn-O dual doping, which is a powerful solution to comprehensively improve the performance of a material. The combination of O and Sn-aliovalent doping not only enables an improved ionic conductivity but more importantly realizes an intensively enhanced interfacial compatibility between argyrodite and Li metal and Li dendrite suppression capability. The assembled battery with Sn-O dual-doped electrolyte and Li anode demonstrates high capacity and decent cycling stability. Dual doping is thus believed to be an effective way to develop high performance sulfide solid electrolytes. (C) 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.