Improved chemical stability and cyclability in Li2S-P2S5-P2O5-ZnO composite electrolytes for all-solid-state rechargeable lithium batteries

Sulfide glasses with high Li+ ion conductivity are promising solid electrolytes for all-solid-state rechargeable lithium batteries. This study specifically examined the chemical stability of Li2S-P2S5-based glass electrolytes in air. Partial substitution of P2O5 for P2S5 decreased the rate of H2S generation from glass exposed to air. The addition of ZnO to the Li2S-P2S5-P2O5 glasses as a H2S absorbent reduced the H2S gas release. A composite electrolyte prepared from 90 mol% of 75Li(2)S.21P(2)S(5).4P(2)O(5) (mol%) glass and 10 mol% ZnO was applied to all-solid-state cells. The all-solid-state In/LiCoO2 cell with the composite electrolyte showed good cyclability as a lithium secondary battery. (C) 2013 Elsevier B. V. All rights reserved.