| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery with long cycle life and high capacity by constituting with an electrode body obtained by spirally winding a positive electrode and a negative electrode through a separator and having specified durometer hardness D. SOLUTION: A positive electrode is formed in such a way that, for example, 80wt.% LiCoO2 acting as a positive active material, 5wt.% acetylene black acting as a conductive material, and 5wt.% polyvinylidene fluoride acting as a binder are mixed, the mixture is dispersed in N-methyl-2-pyrrolidone to prepare slurry, the slurry is uniformly applied to the both surfaces of an aluminum foil having a thickness of 20μm for example, dried, then pressed with a roll. A negative electrode is formed in such a similar way to the positive electrode that PAN base carbon fibers are formed in short fibers serving as a negative active material, a binder and a conductive material same as the positive electrode are mixed in the same ratio as the positive electrode to prepare slurry. Durometer hardness D of an electrode body obtained is preferably specified to 30-70, and tensile strength is preferably specified to 80-1000g/cm. A battery with long cycle life and high capacity can be obtained. |
