Preparation of (50-x)Li2SO4∙xLi2WO4∙50LiPO3 (mol%) Glasses and Their Lithium-ion Conducting Properties

Abstract

With the aim of creating new lithium-ion conducting oxide glasses for all-solid-state lithium-ion batteries, we tried to prepare the glasses in the compositions (50-x)Li 2 SO 4 ∙xLi 2 WO 4 ∙50LiPO 3 (mol%) by use of a traditional melt-quenching method. The glass-transition temperatures of the obtained glasses were increased with an increase of the Li 2 WO 4 contents. The bulk glasses showed relatively high lithium-ion conductivities in the range of 10 -6 to 10 -5 Scm -1 at room temperature. On the other hand, the pellets, which were obtained by pressing the powdered glass samples, showed the conductivities in the range of 10 -7 to 10 -6 Scm -1 at room temperature. The conductivities of the bulk glasses are about one order higher than those of the pellet samples. An all-solid-state battery was composed with the cathode composites of the cathode active materials LiNi and the 25Li 2 SO 4 ∙25Li 2 WO 4 ∙50LiPO 3 (mol%) glass as solid electrolyte. The all-solid-state battery showed good charge-discharge performance at 100°C.