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 Li_1+xAl_xGe_0.2Ti_1.8-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 Li_1.35Al_0.35Ge_0.2Ti_1.45(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 Li_1.35Al_0.35Ge_0.2Ti_1.45(PO₄)₃ sintered at 950 °C.

耐水和高锂离子传导性的固体电解质具有用作水性锂空气电池中的隔膜和用作全固态电池中的电解质的潜力。在这里，我们系统地研究了在900–1000°C烧结的耐水NASICON型Li _{1 + x} Al _x Ge _0.2 Ti _1.8-x（PO ₄）₃（LAGTP; x = 0.25-0.55）的电学和机械性能。的1.58×10的最高的锂离子传导率^{- 3} 小号厘米^{- 1}观察到锂在25℃下_1.35的Al _0.35葛_0.2的Ti _1.45（PO ₄）₃在950°C下烧结，其电导率是先前报道的NASICON型锂离子电导率固体电解质中最高的。的高导电性可通过的6.58×10的高晶界电导率来解释^{- 3} 小号厘米^{- 1}在25℃下。将其浸入饱和LiCl水溶液中一个多月后，电导率没有显示老化的影响。的为110N毫米A 3点弯曲强度^{- 2}也被记录为栗_1.35铝_0.35葛_0.2的Ti _1.45（PO ₄）₃在950烧结℃。