| 摘要 |
PROBLEM TO BE SOLVED: To provide an all-solid-state lithium secondary battery capable of suppressing increase in resistance of a positive electrode layer even when fibrous carbon is used as a conductive assistant for the positive electrode layer.SOLUTION: In an all-solid-state lithium secondary battery 1 that has a positive electrode layer 4, a lithium ion conductive solid electrolyte 5, and a negative electrode layer 6, the positive electrode layer 4 contains fibrous carbon and spherical carbon as a conductive assistant for a positive electrode active material, and thereby, the fibrous carbon and the spherical carbon can be preliminarily composited, and a conductive network is formed between the positive electrode active materials while preventing agglomeration between fibrous carbons. A weight ratio of the fibrous carbon and the spherical carbon is 80/20 to 50/50. An average particle diameter of the spherical carbon is 150 nm or less. An average fiber length of the fibrous carbon is 10 μm or more. The solid electrolyte layer contains one or more elements chosen from silicon, phosphor, and boron, and a sulphide-based solid electrolyte containing sulfur and lithium. |
