PREPARATION OF Li_1.5Al_0.5Ge_1.5(PO₄)₃ SOLID ELECTROLYTE BY SOL-GEL METHOD

Abstract

Li_1+xAl_xGe_2-x(PO₄)₃ (LAGP) solid electrolyte is one of the promising solid electrolytes for lithium ion batteries. The LAGP electrolyte was prepared by a sol-gel method. A gelation powder was calcined at 500 ^oC to obtain precursor powder for LAGP. The obtained powder was pelletized and calcined at 800, 850, and 900 ^oC. The pellets possessed NASICON structure, indicating that the LAGP was successfully prepared. The pellet calcined at 850 ^oC showed the highest lithium ion conductivity, 1.4 × 10^-4 S cm^-1, which is acceptable for all-solid-state lithium battery. Although some modification is still needed to improve the lithium ion conductivity of LAGP prepared by the sol-gel method, this finding provides us a new route for LAGP preparation.