| abstract |
To provide a lithium ion secondary battery in which both initial output and high temperature high rate durability are above a certain level. A lithium ion secondary battery provided by the present invention includes a negative electrode active material layer including a styrene butadiene rubber, carboxymethyl cellulose, and a negative electrode active material. The negative electrode active material has a styrene butadiene rubber coverage on the particle surface of 0.3% or more and 50% or less. [Selection] Figure 1 |