PREPARATION AND APPLICATION OF PEROVSKITE-TYPE SOLID ELECTROLYTES FOR ALL SOLID STATE LITHIUM ION BATTERIES

Abstract

Preparation and application of promising perovskite-type solid electrolytes Li3/8Sr7/16Ta3/4Zr1/4O3 (LSTZ) and Li3/8Sr7/16Nb3/4Zr1/4O3 (LSNZ) were systematically studied. Formation mechanism of LSTZ phase was revealed by thermal analyses and structural characterizations, which was through several stages. Several preparation parameters and factors for LSTZ electrolyte were studied, including PVB binder amount, lithium amount, cooling rate etc. Hot press was adopted to prepare LSTZ electrolyte at lower temperature than solid-state reaction. LSNZ electrolyte was prepared by molecular precursor method, which could produce precursor solution with high homogeneity. All-solid-state batteries LiMn1.5Ni0.5O4 (LMNO)/LSTZ/Li4Ti5O12 (LTO) were constructed and characterized by impedance measurement and cyclic voltammetry.