| abstract |
(57) [Summary] [PROBLEMS] To increase the energy amount of a lithium secondary battery and increase the cycle life. SOLUTION: In a non-aqueous secondary battery having a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive electrode contains a lithium-containing transition metal oxide, the negative electrode contains a compound containing a silicon atom, Further, a non-aqueous secondary battery in which the negative electrode has an expansion coefficient of 1.05 or more and 3.0 or less due to lithium insertion. |