Electrochemical characterization of layered LiCoO2 films prepared by electrostatic spray deposition

LiCoO2 thin-film cathode was deposited on Pt-coated alumina substrate by th e electrostatic spray deposition method. The average film weight of LiCoO2 increased linearly with the deposition time. Electrochemical characterizati on was carried out by cyclic voltammetry and charge/discharge tests. These tests revealed that single phase HT-LiCoO2 films could be obtained by the E SD method at temperature as low as 600 degreesC and the LiCoO2 film deposit ed by the ESD method showed very stable cycling characteristics. The crysta llinity of the LiCoO2 layers increased with increasing annealing temperatur e. XANES results showed that the LiCoO2 film deposited by the ESD method do es not show any changes of the local geometry and electronic structure arou nd Co atoms after electrochemical cycling. (C) 2001 Elsevier Science B.V, A ll rights reserved.