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Title: Li transport in fresh and aged LiMn2O4 cathodes via electrochemical strain microscopy
Author: Luchkin, Sergey Yu
Romanyuk, Konstantin
Ivanov, Maxim
Kholkin, Andrei L
Issue Date: 2015
Publisher: AIP Publishing
Abstract: 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.
Peer review: yes
DOI: 10.1063/1.4927816
ISSN: 1089-7550
Appears in Collections:CICECO - Artigos

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