Water-Stable High Lithium-Ion Conducting Solid Electrolyte of Li1.4Al0.4Ge0.2Ti1.4(PO4)3–LiCl for Aqueous Lithium-Air Batteries

Abstract

Aqueous lithium-air batteries are one of the most promising batteries for electric vehicles because of its high energy and power density. The battery system consists of a lithium anode and an aqueous solution catholyte, which are separated by a water-stable lithiumion-conducting solid electrolyte, and an air electrode. The theoretical energy density of this system is 1,910 W h kg −1 , which is around five times higher than that of conventional lithium-ion batteries. A key component of this system is the water-stable lithium-ion-conducting solid electrolyte. In this work, we have developed a water-stable and water-impermeable solid electrolyte with a high lithium-ion conductivity of around 10 −3 S cm −1 at room temperature by the addition of epoxy resin and LiCl into a tapecast NASICON-type Li 1. 4 Al 0. 4 Ge 0. 2 Ti 1. 4 (PO 4) 3 film. The aqueous lithium-air battery with the solid electrolyte separator was successfully cycled at 0.5 mA cm −2 and 25 • C in an air atmosphere.

Air‐stable inorganic solid‐state electrolytes for high energy density lithium batteries: Challenges, strategies, and prospects

“…What's more, this material provided outstanding electrochemical performance including a high ionic conductivity of 1 × 10 −3 S cm −1 in ambient air 68 . In 2020, Imanishi et al 69 successfully developed a water‐stable LISICON with a high lithium‐ion conductivity for SSBs in electric vehicles. Because of its excellent chemical stability, LISICON was also used as an inert layer in aqueous Li‐O 2 batteries 70,71 and Al‐O 2 batteries 72 .…”

Interface modification of NASICON-type Li-ion conducting ceramic electrolytes: a critical evaluation

“…Taking into consideration these weaknesses of current commercial lithium ion batteries, the approaches for new battery technologies are under development. These so-called next generation Li-ion batteries rely on the design and advancement of solid electrolytes [12][13][14] and cathode materials. 15 Therefore, various solid electrolytes based on ion conducting polymers and ceramics have been developed.…”

Effect of a layer-by-layer assembled ultra-thin film on the solid electrolyte and Li interface

“…Solid electrolytes based on inorganic materials have gained popularity due to their safe operation, and sufficient ionic conductivity [18,21]. Currently there are several types of solid inorganic electrolytes available, namely argyrodite, garnet, Li-nitride, Li-halide, Li-hydrite, perovskite, LISICON and NASICON [22][23][24][25][26][27][28][29][30][31]. Among them, the last mentioned ceramic material caught attention because of its stability towards air and moisture at ambient condition [32][33][34].…”