Patent ID: 7883798
Filing Date: 2011-02-08
Classification: H01M,Y02E

Abstract:
1. A method of preparing an active material for a battery comprising: adding a conductive agent selected from a carbon-based conductive agent, a graphite-based conductive agent, a metal-based conductive agent, or a metallic compound-based conductive agent and a coating-element source to a solvent selected from the group consisting of water, organic solvent, and a mixture thereof to prepare a coating liquid; adding the active material to the coating liquid to coat the active material; and drying the coated active material to form a surface-treatment layer comprising the conductive agent and at least one coating-element-containing compound selected from the group consisting of a coating-element-containing hydroxide, a coating-element-containing oxyhydroxide, a coating-element-containing oxycarbonate, a coating-element-containing hydroxycarbonate, and a mixture thereof, wherein the active material is selected from the group consisting of a lithium-containing alloy, a compound that reversibly forms a lithium-containing compound by a reaction with lithium ions, a material that reversibly intercalates/deintercalates the lithium ions and a lithiated intercalation compound.