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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 10: Battery Materials (joint session KFM/CPP)
KFM 10.2: Talk
Thursday, March 30, 2023, 09:20–09:40, POT 51
Structural response in NCA-type battery cathodes — •Tobias Hölderle1,2, Peter Müller-Buschbaum1,2, and Anatoliy Senyshyn2 — 1TUM School of Natural Sciences, Chair for Functional Materials, Garching, Germany — 2MLZ, TUM, Garching, Germany
Battery-powered electric drivetrains in electric vehicles (EVs) are heavily limited and constrained to the performance of the energy storage device, i.e. battery. Batteries with higher power/energy densities, capacities, and cycling life are needed to increase EVs’ performance and reduce greenhouse gas emissions. Mixed high nickel content LixNi0.8Co0.15Al0.05O2 (NCA) cathode material is one of a few today that simultaneously possess high energy and power densities at lower costs. However, NCA materials suffer from poor thermal stability and limited power density. They display capacity fading/efficiency loss due to antisite defects (cation mixing) in their structure, actively discussed in literature. In order to address the issue of cation mixing, a systematic ex-situ neutron powder diffraction study was done for a series of electrochemically delithiated NCA cathodes. The collected set of structural data was modeled using full-profile Rietveld method and results were discussed in line with observed electrochemical behavior. It is observed that lithium occupancies showed a decreasing character upon charging, independent from transition metal occupancies and indicating an absence of antisite defects (cation mixing) in the commercial NCA material during cell operation.