| 摘要 |
The present invention provides a lithium ion secondary battery in which an electrode assembly, in which a positive electrode sheet having a positive electrode mixture layer and a negative electrode sheet having a negative electrode mixture layer are overlain each other, is housed in a container together with a nonaqueous electrolyte solution. The negative electrode mixture layer includes a carbon material having at least in part a graphite structure as a negative active material. When S (m 2 ) represents a value obtained by calculating a total surface area of the negative electrode active material included in a region of the negative electrode mixture layer lying opposite the positive electrode mixture layer per 1 Ah of capacity of the battery, V represents a value obtained by calculating a total volume of pores included in the region of the negative electrode mixture layer per 1 Ah of capacity of the battery, and N represents the number of lithium ions included within the volume V of the nonaqueous electrolyte solution, the value ± computed by the formula ± = S × N is from 1 × 10 25 to 2.5 × 10 25 . |
