SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 23: Poster II

MM 23.8: Poster

Dienstag, 28. März 2023, 18:15–20:00, P2/OG1+2

High capacity thin film battery electrodes from lithium titanate — Yijie Tao, •Yug Joshi, and Guido Schmitz — Chair of Materials Physics, Institute of Materials Science, University of Stuttgart, 70569 Stuttgart, Germany

Lithium titanium oxide is becoming an increasingly popular anode material for high-power Li-ion batteries due to their safe operating voltages and high cycle lifetime. The motivation to enhance the specific capacity of Li4Ti5O12 (LTO) is of practical significance. In this work, reactive ion beam sputtering is used to deposit the titanium-based metal oxide thin films. A Li2CO3 modification is introduced by mixing it with LTO and using the composite as a target material. The deposition conditions (i.e., reactive oxygen) and annealing treatment (i.e., under air or vacuum at varying temperatures) are explored to optimize the thin films for the best possible capacity. X-ray diffraction (XRD), X-ray photoelectron (XPS) and electron diffraction (TEM) are used to unravel the chemical and structural nature of the thin films. The films were electrochemically characterized using cyclic voltammetry with a broad potential window, much wider than conventional LTO (i.e., 2.5V to 0.1 V vs Li/Li+, whereas conventional electrode is generally limited to a lower voltage of 1V). The optimised film shows good cyclic stability at a relatively high rate of 1 mV/s and show an astounding maximum capacity of 101.4 μAh*cm-2*μm-1 after 50 cycles. To put this in context, conventional LTO shows theoretically 60.8 μAh*cm-2*μm-1 and 91 μAh*cm-2*μm-1 when cycled down to 1 V and 0.1 V vs Li/Li+, respectively.