Journal of the Physical Society of Japan · 2010 · 54 citations · 10 references
Natural SciencesMaterials EngineeringMaterials ScienceElectrochemistryMaterials CharacterizationThin FilmsBattery MaterialsElectrode MaterialsEnergy Storage MaterialsIonic ConductivitySolid ElectrolytesSolid-state ElectrolytesConductivityExcimer LasersOxide Solid ElectrolytesPulsed Laser DepositionSolid Electrolyte CharacterizationSolid-state Lithium BatteriesThin-film BatteriesThin-film Solid Electrolytes
Lithium silicate thin films were successfully deposited by pulsed laser deposition (PLD) technique using an ArF excimer laser. The ionic conductivities, the structures and the stability against CO 2 of the lithium silicate films were examined. The ionic conductivity value at 25 °C was 2.5×10 -8 S cm -1 for Li 2 SiO 3 film and 4.1 ×10 -7 S cm -1 for Li 4 SiO 4 film. Li 4 SiO 4 film was found unstable to CO 2 to form Li 2 CO 3 , but Li 2 SiO 3 film was stable. Solid-state thin film batteries (TFB) consisting of an amorphous lithium silicate electrolyte, crystalline LiCoO 2 positive electrode and Li metal negative electrode were fabricated and characterized. The batteries performed good stabilities for cycles. Higher apparent capacity was obtained in the TFB using Li 4 SiO 4 electrolyte than Li 2 SiO 3 , which is due to the higher conductivity of the Li 4 SiO 4 film.
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