Berlin 2015 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 6: Functional Materials I: Battery Materials

MM 6.1: Vortrag

Montag, 16. März 2015, 10:15–10:30, TC 010

Ultra-Thin All Solid-State Thin-Film Batteries — •Susann Nowak¹, Frank Berkemeier², and Guido Schmitz¹ — ¹Lehrstuhl für Materialphysik, Universität Stuttgart — ²Institut für Materialphysik, Universität Münster

This talk focuses on ultra-thin all solid-state batteries with an overall thickness below 1 µ m. They are prepared with a very good layer quality (roughness below 5 nm) via ion beam sputtering. The homogeneity and structure of the layers and interfaces is proven by cross-section TEM. The studied all solid-state batteries are composed of lithium iron phosphate as a cathode (LFP), lithium phosphorous oxynitride (LiPON) as an electrolyte and Sn or Si as an anode. Battery cells can be charged and discharged more than 100 cycles, still showing more than 50% of the initial capacity. The observed cycling behavior is strongly temperature dependent, exhibiting a increase of the capacity with elevated temperatures. The observed potential curve is compared to the expected one taking into account the charge-discharge behavior of the single electrodes. The influences of the balancing of the electrodes and the lithiation state of the anode on the energy density as well as the observed cell potentials are also discussed.