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We have developed the high ionic conducting glass-ceramics with the crystalline phase of Li 1+x+y Al x (Ti 2¹y Ge y )P 3¹z Si z O 12 with the NASICON type structure. This type of glass-ceramics exhibits high lithium-ion conductivity of 10 ¹4 S cm ¹1 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 LiFePO 4 cathode at room temperature.

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