| 摘要 |
PROBLEM TO BE SOLVED: To provide an active material capable of suppressing sharp change of voltage but superior in controllability of oxidation reduction potential, and a lithium ion secondary battery using the active material superior in controllability of the voltage.SOLUTION: The active material of the lithium ion secondary battery is an element which has a composition expressed by W(x)Me(z)Me(z)...Me(z)O(x+z+z+...+z=1, in which n is an integer larger than 1, and 0<max{z, z,...z}/x<1/2); or an element which has a composition which is expressed by W(x)Mo(z)Ti(z)O(x+z+z=1, 0<z≤x and 0<z≤0.1304), and Meto Memay have a rutile-type structure or an MoO-type structure as an oxide. |
