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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session

MM 18.4: Poster

Monday, March 31, 2014, 18:00–20:00, P4

Sputter-deposited Thin-film Lithium Ion Batteries — •Frank Berkemeier, Yaser Hamedi, and Fabian Inkmann — Universität Münster, Institut für Materialphysik, Wilhelm-Klemm-Str. 10, 48149 Münster

Electrochemical-active thin-film materials are deposited by sputter-deposition technique, with the aim to prepare an all-solid state thin-film lithium-ion battery. For this purpose silicon and tin are used as anode materials, while lithium cobalt oxide and lithium iron phosphate serve as cathodes. As an ion-conducting phase, thin-films of lithium phosphorous oxynitride (LiPON) are deposited. Via this setup, thin-film stacks with an overall thickness of less than 1 µm are prepared, which are characterized by electrochemical techniques like impedance spectroscopy and cyclic voltammetry, as well as by transmission electron microscopy. It is shown that most of the thin-film cells show a reasonable charge-discharge behaviour, as well as a promissing cycling stability. Moreover it is demonstrated that by triggering a reaction between LiPON and a metallic layer like silver or magnesium, an interface reaction layer is formed that is capable to reversibly intercalate/deintercalate lithium. The structure and formation of this reaction layer is studied, and it is shown that in future thin-film cells this layer opens the possibility to substitute conventional thin-film cathodes – with the aim to increase the energy density and to decrease the internal resistance of the cells.