Abstract

Electrochemical lithium insertion/extraction properties at Li4Ti5O12 thin film/lithium phosphorus oxynitride glass electrolyte (LiPON) were investigated using thin film batteries (Li/LiPON/Li4/3Ti5/3O4). The resultant battery performed very stable charge-discharge reactions for over 300 times. In addition, the rate capability under 4-40 μA cm-2 of the film battery was comparable with that of the film electrode in the 1 mol dm-3 LiClO4 dissolved in propylene carbonate solution. Using the Li4/3Ti5/3O4 thin film as negative electrode material, all-solid-state thin-film lithium-ion batteries (Li4/3Ti5/3O4/LiPON/amorphous lithium iron phosphate) were fabricated, where the Li4/3Ti5/3O4 thin film was embedded in LiPON film. This unique assembly permitted charge-discharge reactions at ca. 1.5 V also in air.

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