Positive electrode for lithium-ion secondary cell, and lithium-ion secondary cell

Abstract

A cathode for lithium ion secondary battery of the present invention includes a cathode including a current collector and active material supported on the current collector. The current collector is made of porous metal. The cathode has holes in its surface, and active material density is 50 to 80% of true density of the active material. Because the cathode is thick and supported with the active material densely and the holes are formed in its surface, transfer of an electron and insertion/release of lithium ion take place in the cathode surface and deep in the cathode in the lithium ion secondary battery. Therefore, the lithium ion released from the active material can migrate in the electrolyte solution in the holes, so that the active material present deep in the cathode is effectively utilized, and thus, the lithium ion secondary battery has high capacity and can promptly charge/discharge.

Dependencies are inferred from the claim text.