Lithium-ion conductive glass-ceramics with composition ratio control and their electrochemical characteristics

概要

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We have developed the high ionic conducting glass-ceramics with the crystalline phase of Li1+x+yAlx(Ti2−yGey)P3−zSizO12 with the NASICON type structure. This type of glass-ceramics exhibits high lithium-ion conductivity of 10−4 S cm−1 or more at room temperature. Although this glass-ceramics reacts with Li metal gradually with the passage of time, we have improved the thermal and electrochemical properties by controlling constitution of Ti and Ge in the Li-ion conducting glass-ceramics with the NASICON type structure. Those glass-ceramics worked well as electrolyte of a lithium-ion secondary battery by the charge–discharge test using a half cell with LiFePO4 cathode at room temperature.