High-Power All-Solid Secondary Battery with High Heat Resistance

摘要

We have developed an all-solid lithium-ion secondary battery consisting of a sulfide-based thin film electrolyte and pellet-type electrodes. The safety of lithium-ion batteries is significantly increased by replacing the electrolyte solutions with flame-retardant solid electrolytes. This battery has high performance characterized by a high discharge rate and excellent high-temperature cycle property. The battery showed a discharge capability of 10 C for one minute and capacity maintenance rates of 90% after 1500 cycles at 60℃, 90% after 500 cycles at 80℃, and 70% after 500 cycles at 150℃. We conclude that the thin film electrolyte has improved both the discharge rate and high-temperature cycle performance.