Fabrication of LiCoO_2 Thin-film Electrode by Soft Solution Processing

Thin films of lithium cobalt oxides were synthesized by the soft solution processing in a home-made solution. Films of LiCoO2 were deposited onto nickel substrates at 100℃ without any postsynthesis annealing. Their structure and chemical composition were checked by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectrometry, cyclic voltam-mograms, and galvanostatic charge-discharge pattern analysis. The prepared LiCoO2 films show R3m crystallinity and preferred orientation of (101). the films grow layer by layer with homogenous grains, whose diameters are about 0.3μm. The thin-film electrode displays a good cyclic character and its first discharge capacity is 143mAh/g. LiCoO2 films made by soft solution processing can be used as cathode materials in lithium microbatteries.