| 摘要 |
PROBLEM TO BE SOLVED: To provide an all-solid lithium ion secondary battery superior in battery capacity-keeping characteristic, which a positive electrode active material arranged so that the reaction with sulfur can be effectively suppressed by a single coating thereof is applied to.SOLUTION: An all-solid lithium ion secondary battery comprises: a positive electrode active material including a complex oxide of Li and a transition metal M; a sulfide-based solid electrolyte; and a negative electrode active material. The positive electrode active material is enclosed in the battery as particles each having, on its surface, a coating layer of an ion-conducting substance expressed by LiAlTi(PO), where 0≤X≤0.5. The ion-conducting substance forms interfaces with both of the positive electrode active material and the sulfide-based solid electrolyte. An electric charge travels between the positive electrode active material and the sulfide-based solid electrolyte through the ion-conducting substance. |
