| 摘要 |
PROBLEM TO BE SOLVED: To improve the chemical efficiency and the discharged current utilization factor of an active material and the compatibility of the discharging capacity and life by using a current collector made of a solid bored body, and forming irregular sections on the surface of an active material layer in response to the undulations of the current collector. SOLUTION: A metal thin plate is inserted between rolls provided with projections and recesses in turn, tips of the projections of the rolls are protruded, and bored sections 3 are provided at the tip sections of the projections 2 of a current collector 1. Active material layers 5 are formed on both faces of the current collector 1, and active materials on both faces are connected through the bored sections 3. The recesses of the active material layer 5 corresponding to the recesses of the current collector 1 are formed, an electrolyte is diffused to the deepest recesses of the current collector 1, the active material near the recesses can be activated, and the active material at the surface portion left undercharged during discharging can be reduced. A large-capacity electrode is obtained while the quantity of the active material is decreased. |
