渦巻型リチウムイオン電池用電極およびそれを用いた渦巻型リチウムイオン電池

Japanese Patent JP4199839

B2

PROBLEM TO BE SOLVED: To provide a battery with good energy density and efficiency in which the reduction in capacity through peeling or falling of an active material from an electrode accompanying the charge and discharge cycle is suppressed by providing an electrode having a current collector wound so that a rough surface is situated on the outside, and a smooth other surface is situated on the inside. SOLUTION: A current collector 1 has a roughed surface 1 on one side and a smooth surface 3 on the other side. Active material layers 4, consisting of an active material and a binder having a conductive agent added thereto, are provided on both sides thereof. As a current collector, an aluminum foil the only one side of which is roughened by sand blasting is used, a paste mixture of polyvinylidene fluoride powder, LiNiO2 , and n-methyl-2-pyrolidone is applied to both the sides in a thickness of 0.09 mm as one side and 0.2 mm including both the sides of the foil, and the pyrolidone is then dried and removed, whereby an electrode can be provided. The one side of the current surface is a roughened surface of 3