All-oxide solid-state lithium-ion battery employing 50Li2SO4–50Li2CO3 glass electrolyte

Abstract

Oxide-type all-solid-state lithium-ion batteries are considered as a promising candidate for next-generation batteries because they do not generate toxic gas like their sulfide-type counterparts. However, batteries based on oxide systems exhibit low performance because of several challenges, such as the low ionic conductivity of the solid electrolyte and poor contact between the electrode materials and the solid electrolyte. In this study, an all-inorganic oxide solid lithium-ion battery with very safe performance was manufactured by a room-temperature process and investigated. The 50Li2SO4–50Li2CO3 glass electrolyte was employed as a highly deformable electrolyte to improve the interparticle contact between the electrode active materials and electrolyte. An all-oxide solid-state LiNi1/3Co1/3Mn1/3O2–Li4Ti5O12 cell employing a 50Li2SO4–50Li2CO3 glass electrolyte was successfully prepared by cold pressing and achieved 135 mAh g−1 at 23 μA cm−2 and 60 °C. The calculated energy density of the cell was about 50 Wh kg−1 based on the masses of the positive and negative electrodes and the separate layer. Furthermore, despite its thinner separate layer than that of other cells, it exhibited stable cycle performance without a short circuit that was caused by lithium dendrite growth.