LI-BATTERY ELECTRODE AND LI-BATTERY USING IT, AND MANUFACTURE OF LI-BATTERY ELECTRODE

摘要

PURPOSE: To realize-prolonging a charging/discharging life, and the high capacity of a battery, by substantially removing a binding agent in the vicinity of at least the surface layer part of an electrode including carbon material and the binding agent. CONSTITUTION: Fine carbon particles having desired material is made into slurry, by kneading in a solvent wherein a binding agent is dissolved, to be applied and formed to a current collector such as a copper foil, and after heat treatment, is dipped in the solvent, than the binding agent is partially removed, that is, substantially removed in the vicinity of a surface. The result of the performance test of an electrode, manufactured like this, shows the improvement of the capacity of electric charging/ discharging and a life, and this seems to be caused by the approachability of an electrolyte to an electrode inside due to the increase of the surface area of carbon material contacting the electrolyte, and the characteristic deterioration prevention of the electrode surface based on the restraint of coat generation by the electrolyte and the binding agent. Also, the lowering of charging capacity to carbon material to unit weight can be restrained by the press working of a mold body in manufacturing an electrode.