| abstract |
Provided is a nonaqueous electrolyte secondary battery which is inexpensive, has excellent charge / discharge characteristics, particularly excellent cycle characteristics, and has a small battery swelling due to high temperature storage or cycling. In a non-aqueous electrolyte secondary battery according to the present invention, a negative electrode active material includes a composite carbon material in which the surface of carbonaceous particles serving as nuclei is coated with amorphous carbon. The solvent contains vinylene carbonate (VC), and the amount of vinylene carbonate (VC) added is set to 0.01% by mass or more and 10.0% by mass or less based on the mass of the solvent. As a result, a new effect of suppressing battery swelling after leaving at high temperatures or cycling, which is a problem when VC is added, is obtained, and a nonaqueous electrolyte secondary battery having excellent charge / discharge characteristics and cycle characteristics is obtained. It is possible to obtain. [Selection diagram] None |