Thin-film lithium ion batteries with Li-V-Si-O amorphous solid electrolyte fabricated by pulsed laser deposition

Solid-state thin-film lithium-ion batteries consisting of an amorphous Li2O-V2O5-SiO2 solid electrolyte (LVSO), crystalline LiCoO2 cathode and amorphous SnO anode were fabricated by pulsed laser deposition technique. The morphology of the films were sensitive to the preparation conditions especially the optical absorbance of the target materials. The film was characterized by X-ray diffraction, FE-SEM, AFM and ICP-AES. The ionic conductivity of the LVSO film is estimated by impedance spectroscopy to be 2.5 x 10(-7) Scm(-1) at 25 degrees C with activation energy of 0.54 eV. The thin-film 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.