To provide a secondary battery hardly degrading capacity by a charge/ discharge cycle at a high temperature by using lithium manganese composite oxide as a positive electrode active material, by using a material by adding a cation exchange resin to a material mainly composed of a polyolefine resin as a separator.
Lithmum manganese composite oxide having the average particle size 10 μm as a positive electrode active material, carbon powder as a conductive assistant and polyvinylidene fluoride as a binding agent are mixed in wt.% of (82:12:6). N-methyl-2-pyrolidone is inputted/mixed there to manufacture a slurry-like solution to be applied to Al foil, and after being dried, it is rolled and cut. A carbon material capable of storing/releasing a lithium ion is used as a negative electrode active material. 90 wt.% the carbon material and 10 wt.% of the polyvinylidene fluoride as a binding agent are mixed, and the N-methyl-2-pyrolidone is inputted/mixed to manufacture a slurry-like solution to be applied to both surface of copper foil, and after being dried, it is rolled and cut.
HIGASHIMOTO KOJI
MAEJIMA TOSHIKAZU
