| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery which is superior in the adhesion with a current collector, and which is superior in charge and discharge cycle characteristics even under high- and low-temperature conditions.SOLUTION: A lithium ion secondary battery according to the present invention comprises: a secondary battery electrode having an electrode layer including (A) 100 pts.mass of at least one polymer selected from a group consisting of styrene butadiene copolymers, and copolymers obtained from vinyl monomers having (meth)acrylic acid ester and acid components, and (B) 1-20 pts.mass of at least one nonionic surfactant selected from a group consisting of polyoxyethylene alkyl ether derivatives, polyoxyethylene-polyoxypropylene condensation products, and polyoxyethylene-polyoxypropylene alkyl ether derivatives, whose cloud points are 70°C or below; and a counter electrode having an electrode layer including PVDF. |
