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Li transport in fresh and aged LiMn2O4 cathodes via electrochemical strain microscopy

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Resumo:Transport properties of Li+ mobile ions in fresh and aged LiMn2O4 battery cathodes were studied at the nanoscale via electrochemical strain microscopy (ESM), time spectroscopy, and voltage spectroscopy mapping. Both Vegard and plausible non-Vegard contributions to the ESM signal were identified in electrochemical hysteresis loops obtained on fresh and aged samples. In the fresh cathodes, the Vegard contribution dominates the signal, while in the aged samples different shape of hysteresis loops indicates an additional plausible non-Vegard contribution. Non-uniform spatial distribution of the electrochemical loop opening in LiMn2O4 particles studied in the aged samples indicates stronger variation of the Li diffusion coefficient at the microscale as compared to the fresh specimens. Time spectroscopy measurements revealed a suppression of the local Li diffusivity in aged samples. The mechanisms of the cathode aging are discussed in the context of observed nanoscale ESM response. (C) 2015 AIP Publishing LLC.
Autores principais:Luchkin, Sergey Yu.
Outros Autores:Romanyuk, Konstantin; Ivanov, Maxim; Kholkin, Andrei L.
Assunto:LITHIUM-ION BATTERIES NANOMETER RESOLUTION ELECTRONIC-STRUCTURE SPINEL DIFFUSION STOICHIOMETRY SPECTROSCOPY TEMPERATURE MANGANITES CONDUCTION
Ano:2015
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso aberto
Instituição associada:Universidade de Aveiro
Idioma:inglês
Origem:RIA - Repositório Institucional da Universidade de Aveiro

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