Preparation of all-solid-state thin film secondary batteries by pulsed laser deposition method

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Recent developments of the electronic devices strongly demand very small energy sources with high power density. A thin-film lithium-ion battery is one of the candidates for satisfying these demands. In this project we have tried and succeeded in preparation of all-solid-state thin film batteries by using a pulsed laser deposition (PLD) method.First, we have investigated the condition for preparing amorphous lithium ion conductor films by thermal evaparation and PLD method. A good quality amorphous thin film was obtained for the Li4SiO4-Li3VO4 by PLD, which can be used as the solid electrolyte for batteries. The film was characterized through X-ray, FT -IR, Raman, a field emission scanning electron microscope (FE-SEM), an atomic force microscope (AFM) and an inducting coupled plasma (ICP). The ionic conductivity of the film was 10-7S/cm at room temperature.Second, we have prepared cathode and anode thin films also by PLD method. Then, we found the good preparation condition for LiCoO2 as a cathode and SnO as an anode.Thirdly, based on these results, we have demonstrated to prepare some all-solid-stete thin film secondary lithium ion batteries only by PLD method. The battery consisted of LiCoO2/LVSO/SnO exhibited a good performance of of an open circuit voltage of about 2.7 V, and a good reversibility on charge-discharge cyclings over 100 cycles between 0 and 3.3 V. The thin-film battery can be handled in open atmosphere before charging.