| 摘要 |
A lithium-ion secondary battery (100A) has a negative electrode current collector (241A) and a negative electrode active material layer (243A) formed on the negative electrode current collector (241A). The negative electrode active material layer (243A) contains a graphite material and a binder. The negative electrode active material layer (243A) has a first region (A1) neighboring the negative electrode current collector (241A), and the first region (A1) contains natural graphite in a weight ratio of equal to or greater than 80% of the graphite material. The negative electrode active material layer (243A) has a second region (A2) neighboring a surface thereof, and the second region (A2) contains artificial graphite in a weight ratio of equal to or greater than 80% of the graphite material. |
