Regensburg 2019 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 26: Materials for Energy Storage and Conversion

MM 26.3: Talk

Wednesday, April 3, 2019, 15:30–15:45, H43

Electrochemical and Microstructural Analysis of High-capacity Li-Mn-O Thin Film Battery Electrodes — •Henry Müller, Yug Joshi, Efi Hadjixenophontos, Claudia Peter, and Guido Schmitz — Institute of Materials Science, Chair for Materials Physics, University of Stuttgart, Heisenbergstraße 3, 70569 Stuttgart, Germany

Research worldwide has taken on the challenge to develop new electrode materials for cost-efficient, reliable batteries with higher capacities. We present a sputter-deposited thin film cathode made from manganese oxide with up to three times the capacity observed in comparable conventional LiMnO electrodes from the well-known spinel structure. The novel microstructure, domains of rock salt, monoclinic and spinel crystal structures, unlocks the voltage range from 2V to 4.4V vs. Li for long term cycling at the capacity of 225 mAh/g. We characterize the material on the nano-scale using high-resolution transmission electron microscopy and electron diffraction. Furthermore, we investigate the influence of oxygen deficiency on the capacity and electrochemical behavior of the electrode. The in-situ tailoring of electrode properties is possible by controlling the oxygen partial pressure during deposition.