Surface Modification of Thin-Film Based LiCoPO[sub 4] 5 V Cathode with Metal Oxide

The electrochemical performance of as a 5 V cathode material for lithium batteries was investigated in electrolyte. It was demonstrated that using this electrolyte salt significantly improves the electrochemical behavior of as it is accompanied by a faster diffusion process. In addition, another approach, viz., surface/chemical modification of the cathode with a metal oxide, was employed to reduce capacity fades appearing at elevated temperatures. To this aim, a thin layer of was deposited on the cathode surface by a sputtering method. The results obtained from experimental investigations are indicative of the fact that both approaches significantly improve cyclability of the cathode. Such improvements provide a satisfactory cyclability for to be used as a 5 V cathode material. © 2004 The Electrochemical Society. All rights reserved.