Thin-film lithium-ion battery with amorphous solid electrolyte fabricated by pulsed laser deposition

Solid-state thin-film batteries consisting of an amorphous Li2O-V2O5-SiO2 solid electrolyte (LVS% crystalline LiCoO2 cathode and amorphous SnO anode were fabricated and characterized. All the thin-films were prepared by pulsed laser deposition technique. The amorphous LVSO thin-film has a smooth and dense surface without any pinhole, whose composition was analyzed to be Li2.2V0.54Si0.46O3.4. The ionic conductivity of the LVSO film is estimated by impedance spectroscopy to be 2.5 x 10(-7) S cm(-1) at 25 degreesC with activation energy of 0.54eV. The thin-film battery can be handled in open atmosphere before charging. The battery exhibits an open circuit voltage at full charge of about 2.7 V, and a good reversibility on charge-discharge cycling over 100 cycles between 0 and 3.3 V. (C) 2004 Elsevier B.V. All rights reserved.