Preparation of NASICON-Type Nanosized Solid Electrolyte Li1.4Al0.4Ti1.6(PO4)3 by Evaporation-Induced Self-Assembly for Lithium-Ion Battery.

Xingang Liu,Chuhong Zhang,Ju Fu

doi:10.1186/s11671-016-1768-z

Abstract

A simple and practicable evaporation-induced self-assembly (EISA) method is introduced for the first time to prepare nanosized solid electrolyte Li1.4Al0.4Ti1.6(PO4)3 (LATP) for all-solid-state lithium-ion batteries. A pure Na+ super ion conductor (NASICON) phase is confirmed by X-ray diffraction (XRD) analysis, and its primary particle size is down to 70 nm by optimizing evaporation rate of the solvent. Excellent room temperature bulk and total lithium-ion conductivities of 2.09 × 10−3 S cm−1 and 3.63 × 10−4 S cm−1 are obtained, with an ion-hopping activation energy as low as 0.286 eV.

Highlights

All-solid-state batteries using ceramic electrolytes have attracted great interests due to their good chemical stability, high ionic conductivity, and superior safety which have been considered as the ultimate safe batteries [1]
Li1+xAlxTi2−x(PO4)3 (LATP) is one of the fastest lithiumion-conducting ceramics with a Na+ super ion conductor (NASICON) type structure [2], offering great potential as solid electrolytes applied in all-solid-state lithium-ion batteries (LIBs) [3]
Based on the Thermogravimetric analysis (TGA) result, in order to obtain final LATP powders, the dried gel was devised to a heat treatment procedure as described in the experimental section

Summary

Background

All-solid-state batteries using ceramic electrolytes have attracted great interests due to their good chemical stability, high ionic conductivity, and superior safety which have been considered as the ultimate safe batteries [1]. Li1+xAlxTi2−x(PO4) (LATP) is one of the fastest lithiumion-conducting ceramics with a Na+ super ion conductor (NASICON) type structure [2], offering great potential as solid electrolytes applied in all-solid-state lithium-ion batteries (LIBs) [3]. There are various methods to synthesize LATP such as solid state reaction, co-precipitation, sol-gel, and melting-quenching methods [6,7,8,9]. High temperature approaches including solid state reaction and melting-quenching usually involve high energy consumption and loss of stoichiometric lithium associated with impurities in the final product.

Methods

Results and Discussion

Conclusions