Patent ID: 8585874
Filing Date: 2013-11-19
Classification: C23C,H01M,Y02E

Abstract:
1. A method of preparing a positive active material for a lithium battery, comprising the steps of: (1) depositing a positive active material on an electrode on a substrate; (2) putting metal chips on a metal oxide target and performing a sputtering process, thereby depositing mixed metal-oxides on the positive active material; and (3) additionally heat-treating the substrate having the mixed metal-oxides thereon under conditions of temperature of 100-500° C. and pressure of 1-7 mTorr, after the step (2), wherein the mixed metal-oxides are amorphous and the step (2) is performed with cooling the metal oxide target to 5-15° C., wherein the metal chips comprise Zr and/or Ti, and wherein the metal oxide comprises AlO