| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery arranged so that the occurrence of the unevenness in a salt concentration of a nonaqueous electrolyte can be suppressed.SOLUTION: A lithium ion secondary battery provided according to the present invention comprises: an electrode body including a positive electrode, a negative electrode and a separator; and a nonaqueous electrolyte. In the secondary battery, the negative electrode includes negative electrode active material particles. The negative electrode active material particles are composite particles formed by plating core particles with a metal. Further, the metal used for the metal plating is a metal which occludes no Li ion. In the composite particles, the percentage of metal plating is 11-35% based on a specific surface area. |
