Solid State Ionics, Vol.180, No.11-13, 900-903, 2009
Effect of chitosan on deposition of LiCoO2 thin film for Li-ion batteries
Deposition of LiCoO2 thin film using chitosan-added precursor solution was found to be a cost-effective way to fabricate cathode for Li-ion thin film batteries. The structures and electrochemical performance of such LiCoO2 cathode were characterized by using an X-ray diffracotmeter (XRD), FTIR and charge-discharge tests. After annealing at ca. 500 degrees C, the results of XRD showed that the LiCoO2 gel started to crystallize and showed hexagonal phase with a space group of Rim. The enhanced stability of the precursor solution by the addition of chitosan is attributed to the complexation between metal ions and the -NH2 groups of chitosan. The electrochemical behaviour for the deposited films calcined at 700 degrees C for 4 h was also characterized by charge-discharge test. The result revealed that the film deposited from chitosan-containing precursor solution possesses an initial discharge capacity of 129 mAh g(-1). (c) 2009 Published by Elsevier B.V.
Keywords:Chitosan;Li-ion batteries