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

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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. (C) 2015 AIP Publishing LLC.

keywords

LITHIUM-ION BATTERIES; NANOMETER RESOLUTION; ELECTRONIC-STRUCTURE; SPINEL; DIFFUSION; STOICHIOMETRY; SPECTROSCOPY; TEMPERATURE; MANGANITES; CONDUCTION

subject category

Physics

authors

Luchkin, SY; Romanyuk, K; Ivanov, M; Kholkin, AL

our authors

foto Andrei Kholkin

Andrei Kholkin

Retired Researcher
foto Konstantin Nikolaevich Romanyuk

Konstantin Nikolaevich Romanyuk

Junior Researcher
foto Maxim Ivanov

Maxim Ivanov

Junior Researcher
foto Sergey Luchkin

Sergey Luchkin

PhD Student

Groups

G2 - Photonic, Electronic and Magnetic Materials

acknowledgements

The work was supported by the European Commission within FP7 Marie Curie Initial Training Network

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Publication Details

type
Journal Article
year
2015
journal
JOURNAL OF APPLIED PHYSICS
volume
118
article number
72016
publisher
AMER INST PHYSICS
issn
0021-8979
issue
7
digital object identifier
10.1063/1.4927816
web of science article identifier
WOS:000360441900017

Journal Metrics (JCR 2019)

Journal Impact Factor
2.286
Journal Impact Factor (5 yrs)
2.138
category normalized journal percentile
54.87

Citations

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