Imaging voids and defects inside Li-ion cathodeLiNi0.6Mn0.2Co0.2O2 single crystals
Isaac Martens, Victor Vanpeene, Nikita Vostrov, Steven Leake, Edoardo Zatterin, Jérémie Auvergniot, Jakub Drnec, Marie-Ingrid Richard, Julie Villanova, Tobias Schulli
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Source: Crossref
Published: Jun 27, 2023
DOI: 10.26434/chemrxiv-2023-p621k
Open original source ↗Source abstract
Li-ion battery cathode active materials obtained from different sources or preparation methods often exhibit broadly divergent performance and stability, despite no obvious differences in morphology, purity, and crystallinity. We show how state-of-theart, commercial, nominally single crystalline LiNi0.6Mn0.2Co0.2O2 (NMC-622) particles possess extensive internal nanostructure even in the pristine state. Scanning X-ray diffraction microscopy reveals the presence of interlayer strain gradients and crystal bending attributed to oxygen vacancies. Phase contrast X-ray nano-tomography detects substantial quantities of nano-voids hidden inside the bulk.
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