Development of Glass-Based Solid Electrolytes for Lithium-Ion Batteries
The development of glass-based solid electrolytes for lithium-ion batteries is reviewed. Strategies for preparing glass electrolytes with high Li+ ion conductivity are as follows: increase in Li+ ion concentration, change from oxide matrix to a sulfide one, and stabilization at room temperature of high-temperature or metastable phase by crystallization of glass. Glass electrolytes with high Li+ ion concentration were prepared by rapid quenching and mechanochemical techniques. Oxysulfide glasses in a Li2S-SiS2-Li4SiO4 system and sulfide glass ceramics in a Li2S-P2S5 system are suitable as solid electrolytes with a high ion conductivity of 10−3 S cm−1 at room temperature and a wide electrochemical window of more than 5 V. The sulfide glass-based compounds were applied as solid electrolytes to bulk-type, all-solid-state rechargeable lithium batteries. The solid-state batteries using Li4Ti5O12 active material exhibited a high rate capability with excellent cyclability for 700 cycles at a high temperature of 100 °C.
KeywordsCrystallization Quartz Phosphorus Graphite Sulfide
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