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MM: Fachverband Metall- und Materialphysik
MM 9: Poster
MM 9.18: Poster
Montag, 17. März 2025, 18:30–20:30, P1
Synthesis, and Characterization of Li/Mn-Excess Cathode Materials for Li-ion Batteries. — •John Karuga1, Mesfin Kebede2, and Guido Schmitz3 — 1Institute of Materials Science, Department for Material Physics, University of Stuttgart — 2Institute of Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa — 3Institute of Materials Science, Department for Material Physics, University of Stuttgart
The study aims to mitigate O2 evolution, spinel phase, and unstable CEI formation common in Li/Mn-excess cathodes. The poster presents preliminary results of the pristine Li/Mn-excess cathodes, which are practical alternatives to LFP, NCA, and Ni-excess materials for high-performance Li-ion batteries. The Li2MnO3 phase in Li/Mn-excess cathodes stabilizes the crystal structure, contributes to the higher discharge capacities >250 mAh/g. Commercialization of Li/Mn-excess materials remains challenging due to undesired transformation from layered to spinel phase, O2 evolution, parasitic reactions with the LiPF6 electrolyte. The Li/Mn excess materials were prepared via solid-state synthesis. Characterization with SEM-EDS, Raman, HR-TEM, and XRD confirmed the development of a material of uniform nano-crystallites with well-layered structure and 0.472 and 0.2 nm interplanar distances, which correspond to the 003 and 104 planes. The CV analysis confirms that the redox reactions (Ni2+/Ni4+; Co3+/Co4+; Mn3+/Mn4+/5+/7+) are highly reversible. The charge transfer resistance is low, indicative of better Li+ diffusion and stable CEI.
Keywords: Li/Mn-Excess Cathodes; Li-ion batteries; Phase transformation; Voltage fading