| 摘要 |
A lithium ion secondary battery including a positive electrode, a negative electrode, an electrolytic solution, and a separator, in which the negative electrode includes a negative electrode active material layer formed from a slurry composition for a negative electrode which includes a binder composition for a negative electrode including a particulate polymer A containing an aliphatic conjugated diene monomer unit and a negative electrode active material. The positive electrode includes a positive electrode active material layer formed from a slurry composition for a positive electrode which includes a binder composition for a positive electrode including a particulate polymer B containing an ethylenically unsaturated carboxylic acid monomer unit, and a positive electrode active material. |
| 主权项 |
1. A lithium ion secondary battery comprising a positive electrode, a negative electrode, an electrolytic solution, and a separator,
wherein the negative electrode includes a negative electrode active material layer formed from a slurry composition for a negative electrode which includes a binder composition for a negative electrode including a particulate polymer A containing an aliphatic conjugated diene monomer unit, and a negative electrode active material, a swelling degree of the binder composition for a negative electrode with respect to the electrolytic solution obtained by dissolving an electrolyte in a solvent having a solubility parameter of 8 to 13 (cal/cm3)1/2 is 1 to 2 times, a repeating tensile strength of the binder composition for a negative electrode swollen by the electrolytic solution is 0.5 to 20 Kg/cm2 at a low extension modulus of 15%, the positive electrode includes a positive electrode active material layer formed from a slurry composition for a positive electrode which includes a binder composition for a positive electrode including a particulate polymer B containing an ethylenically unsaturated carboxylic acid monomer unit, and a positive electrode active material, a swelling degree of the binder composition for a positive electrode with respect to the electrolytic solution obtained by dissolving an electrolyte in a solvent having a solubility parameter of 8 to 13 (cal/cm3)1/2 is 1 to 5 times, and a repeating tensile strength of the binder composition for a positive electrode swollen by the electrolytic solution is 0.2 to 5 Kg/cm2 at a low extension modulus of 15%. |
