POSITIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY USING CONDUCTIVE METAL FOIL WITH SPECIFIC RANGE OF ROUGHNESS AT SURFACE WHERE ACTIVE MASS LAYER IS FORMED AS CURRENT COLLECTOR, AND LITHIUM SECONDARY BATTERY

摘要

PURPOSE: A positive electrode for a lithium secondary battery and a lithium secondary battery containing the positive electrode are provided, to increase the coating capacity of an active material and to improve volume energy density and load characteristic. CONSTITUTION: The positive electrode is obtained by locating an active material containing a lithium-containing olivine-type phosphate and an active mass containing a conducting agent and a binder on a current collector comprising a conductive metal foil, wherein the surface of the current collector where the active mass is formed has a roughness (Ra) of 0.1 micrometers or more. Preferably the current collector comprises aluminium or an aluminium alloy; and the lithium-containing olivine-type phosphate is a compound containing LiFePO4. Preferably the coating capacity of the active material on the active mass layer is 1.6 mAh/cm2 or more.