Microstructural visualization of compositional changes induced by transition metal dissolution in Ni-rich layered cathode materials by high-resolution particle analysis

By D. Ko, Jun‐Ho Park, Sungjun Park, Yong-nam Ham, Sungjin Ahn, Jinhwan Park, H. Han, Eunha Lee, W. Jeon, C. Jung. Nano Energy, 2019

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Abstract The dissolution of transition metals (TMs) from LiMO2 (M = Ni, Co, Mn) cathodes and their subsequent side reactions on the anode and in the electrolyte result in Li-ion battery capacity and power losses. Despite the importance of this process, the lack of adequate analysis methods for tracking the subtle compositional changes at specific locations with nano-meter spatial resolution has prevented the elucidation of its microstructural origin and mechanism. Herein, we studied the dissolution of TMs from a Ni-rich layered cathode and investigated their deposition on a graphite anode and reactions with the electrolyte, with focus on the microstructural aspects. Changes in TM and oxygen contents in Ni-rich LiNi0.87Co0.09Mn0.04O2 (NCM) cathode materials were two-dimensionally visualized on a micro-scale gathering by nano-scale analysis, which enabled high-resolution particle analysis, through transmission electron microscopy coupled with X-ray energy dispersive spectroscopy. Degraded (capacity retention

Subfields: Electrical and Electronic Engineering, Mechanical Engineering, Surfaces, Coatings and Films

View Paper: https://www.semanticscholar.org/paper/b59295a990da51524cb5d12d2d651e66c012c105