| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery in which a cycle property is improved. SOLUTION: In the lithium ion secondary battery in which a negative electrode active substance 12 formed on the negative electrode side current collection foil 10 and a positive electrode active substance 16 formed on the positive electrode side current collection foil 14 are opposingly arranged via a separator 18, Li7Ti5O12 is used as the positive electrode active substance 16 and Li4Ti5O12 is used as the negative electrode active substance. By this, changes of crystal structure of positive electrode and negative electrode can be made smaller, and the elevation of internal resistance by fine division of crystal grain can be suppressed, so that the cycle property of lithium ion secondary battery can be improved. |
