| 摘要 |
PROBLEM TO BE SOLVED: To reduce the interruption of an ion transporting route caused by the mismatch of the distortions by expansion and contraction of a solid electrolyte and an active material by using an active material consisting of the sintered body of an inorganic oxide having a volume ratio in charge end state of a specified value. SOLUTION: As a positive electrode or negative electrode, the sintered body of an oxide containing a transition metal capable of storing and releasing Li ion by electrochemical oxidation-reduction reaction which has a volume change ratio in charge end state of 1.5% or less is used. Examples of such a sintered body include an active material having a spinel structure, particularly, Li[Li0.1 Mn1.9]O4, Li[Li1/3Mn5/3]O4, Li[Li1/3Ti5/3]O4 and the like. The active material directly forms a bonding interface with a solid electrolyte, and this bonding interface is formed by means of baking with a hot press. Consequently, ion conduction is never arrested by an intermediate layer or the like. |
