| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of an electrode body having excellent permeability of electrolyte into the electrode body, and to provide a lithium ion secondary battery.SOLUTION: The manufacturing method of an electrode body including a collector plate and an electrode layer formed by laminating a plurality of electrode films 31, 32 thereon includes: a coating step for forming an active material-containing film by applying a coating liquid containing an electrode active material, a binder and a solvent; and a heating step for forming an electrode layer 25 composed of a laminate of a plurality of electrode films by simultaneously heating a plurality of laminated active material-containing films 41, 42. In the laminated active material-containing films, the solvent of an active material-containing film on the collector side has a volatilization temperature higher than that of the solvent of an active material-containing film on the other side. In the heating step, the temperature is raised gradually depending on the volatilization temperature of the solvent of the laminated active material-containing film. A lithium ion secondary battery has this electrode body. |
