| 摘要 |
Provided is a lithium ion secondary battery in which a cover layer having fine pores but lacking pores of large size is provided on a negative electrode active material layer. The lithium ion secondary battery has a positive electrode, a negative electrode, and a non-aqueous electrolyte solution, and is characterized in that the negative electrode has a current collector, a negative electrode active material layer arranged on the surface of the current collector and containing a negative electrode active material and an organic solvent-based binder, and a cover layer arranged on the surface of the negative electrode active material layer, containing a ceramic powder and a water-based binder, and having fine pores. |
