| abstract |
An object of the present invention is to increase the amount of energy and increase the cycle life of a lithium secondary battery. In a nonaqueous secondary battery having a positive electrode, a negative electrode, and a nonaqueous electrolyte, the positive electrode contains a lithium-containing transition metal oxide, the negative electrode contains a compound containing a silicon atom, and the negative electrode The non-aqueous secondary battery whose expansion coefficient accompanying lithium insertion is 1.05 or more and 3.0 or less. [Selection figure] None |