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The electrochemical stability of LiCoO 2 thin films was improved by cerium-phosphate coating deposited at room temperature. The cerium-phosphate coating layer also effectively suppressed the increase of charge-transfer resistance during cycling. However, the cycling stability and the initial capacity of the coated LiCoO 2 thin films deteriorated as the annealing temperature increased, different from other metal-phosphate coating. These phenomena were attributed to the interdiffusion between thedoi:10.1557/jmr.2007.0092 fatcat:lpemkoff55gwvc2p6l3mak4sdu