Fabrication of solid thin film electrolyte and LiCoO2 by aerosol flame pyrolysis deposition

Abstract

Aerosol flame pyrolysis deposition method was applied to deposit the oxide glass electrolyte film and LiCoO2 cathode for thin film type Li-ion secondary battery. The thicknesses of as-deposited porous LiCOO2 and Li2O-Li2O-B2O3-P2O5 electrolyte film were about 6 mu m and 15 mu m, respectively. The deposited LiCoO2 was sintered for 2 min at 700 degrees C to make partially densified cathode layer, and the deposited Li2O-P2O5-B2O3 glass film completely densified by the sintering at 700 degrees C for 1 h. After solid state sintering process the thicknesses were reduced to approximately 4 mu m and 6 mu m, respectively. The cathode and electrolyte layers were deposited by continuous deposition process and integrated into a layer by co-sintering. It was demonstrated that Aerosol flame deposition is one of the good candidates for the fabrication of thin film battery.