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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 25: Poster

KFM 25.18: Poster

Donnerstag, 8. September 2022, 15:00–18:00, P2

Structural behavior of delithiated Li_xNi_0.8Co_0.15Al_0.05O₂ (0<x<1) battery cathodes — •Tobias Hölderle^1,2, Peter Müller-Buschbaum^1,2, and Anatoliy Senyshyn² — ¹Lehrstuhl für funktionelle Materialien, Technische Universität München, Garching, Germany — ²Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching, Germany

The development of portable electronic devices up to electric vehicles powered with lithium-ion batteries led to an increased demand for lithium-ion batteries with higher capacities, energy/power densities, and cycling life. One of the most encouraging and state of the art commercial cathode materials are mixed lithium Ni, Co, Al metal oxides, e.g. in the form of high nickel content LiNi_0.8Co_0.15Al_0.05O₂ (NCA) cathodes possessing high energy and power densities at lower costs. Besides advantages, NCA materials possess several essential drawbacks. For example, NCA cathode materials are known to suffer from poor thermal stability, pronounced capacity as well as power density fading, and antisite disorder in NCA materials [1]. In the current contribution, a systematic ex-situ neutron powder diffraction study on differently electrochemically delithiated NCA cathode materials is presented. A set of structural parameters was obtained using full-profile Rietveld refinement. The lithium occupations reflect the increasing state-of-charge whilst the occupations of transition metals do not change, indicating the absence of antisite defects (cation mixing) in the NCA material. [1] C. Xu, P. J. Reeves, Q. Jacquet and C. P. Grey, Adv. Energy Mater., 11, 2003404 (2021).