Abstract
The all-solid-state batteries offer an attractive option owing to their potential in improving the safety and achieving both high power and high energy densities. The solid electrolyte is a key issue for the development of all-solid-state batteries. Although high ionic conductivity has been achieved for the sulfide electrolyte system, metal anodes are necessary for the electrode selection to improve the energy density of the batteries. Stability of the electrolytes to low voltage region vs. lithium is an important factor for the use of this purpose. Among the sulphide electrolytes proposed, the LGPS (Li10GeP2S12) family exhibits high bulk conductivity of over 10- 2 S cm-1 at room temperature and has a wide variety of compositions, which provide various conductivity and stability characteristics. The present study reviews the materials of the LGPS-type solid electrolytes and the reactions with metal anode systems.
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