Abstract
Water-stable and high lithium-ion conductivity solid electrolytes have potential for application as the separator in aqueous lithium-air batteries and as the electrolyte in all-solid-state batteries. Herein we have systematically examined the electrical and mechanical properties of water-stable NASICON-type Li1+xAlxGe0.2Ti1.8-x(PO4)3 (LAGTP; x = 0.25–0.55) sintered at 900–1000 °C. The highest lithium-ion conductivity of 1.58 × 10−3 S cm−1 at 25 °C was observed for Li1.35Al0.35Ge0.2Ti1.45(PO4)3 sintered at 950 °C, the conductivity of which is the highest in the NASICON-type lithium-ion conductivity solid electrolytes reported previously. The high conductivity could be explained by the high grain boundary conductivity of 6.58 × 10−3 S cm−1 at 25 °C. The conductivity showed no effect of aging after more than one month immersed in saturated LiCl aqueous solution. A 3-point bending strength of 110 N mm−2 was also recorded for Li1.35Al0.35Ge0.2Ti1.45(PO4)3 sintered at 950 °C.
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