Enhanced electrochemical properties of fluoride-coated LiCoO2 thin films

Abstract

The electrochemical properties of fluoride-coated lithium cobalt oxide [LiCoO 2 ] thin films were characterized. Aluminum fluoride [AlF 3 ] and lanthanum fluoride [LaF 3 ] coating layers were fabricated on a pristine LiCoO 2 thin film by using a spin-coating process. The AlF 3 - and LaF 3 -coated films exhibited a higher rate capability, cyclic performance, and stability at high temperature than the pristine film. This indicates that the AlF 3 and LaF 3 layers effectively protected the surface of the pristine LiCoO 2 film from the reactive electrolyte.