Patent ID: 8586239

Claim:
A positive electrode for lithium secondary batteries comprising a conductive layer overlaid on the surface of a positive electrode collector, and an active material layer overlaid on the conductive layer, wherein said conductive layer comprises at least one water-insoluble polymer, as a first binder, that is soluble in organic solvents, and a first conductive material, said active material layer comprises at least one aqueous polymer, as a second binder, that is soluble or dispersible in water, a positive electrode active material, and a second conductive material, the average particle size (D A ) of the first conductive material in said conductive layer is smaller than the average particle size (D B ) of the second conductive material in said active material layer, and wherein a relationship between a specific surface area (C A ) [m 2 /g] of the first conductive material in the conductive layer and a weight of the first conductive material in the conductive layer per a unit surface area of the conductive layer (W A ) [g/m 2 ], and a specific surface area (C B ) [m 2 /g] of the second conductive material in the active material layer and a weight of the second conductive material in the active material layer per a unit surface area of the active material layer (W B ) [g/m 2 ] satisfies (C B W B /C A W A )<5.4.