Li transport in fresh and aged LiMn2O4 cathodes via electrochemical strain microscopy
authors Luchkin, SY; Romanyuk, K; Ivanov, M; Kholkin, AL
nationality International
journal JOURNAL OF APPLIED PHYSICS
keywords LITHIUM-ION BATTERIES; NANOMETER RESOLUTION; ELECTRONIC-STRUCTURE; SPINEL; DIFFUSION; STOICHIOMETRY; SPECTROSCOPY; TEMPERATURE; MANGANITES; CONDUCTION
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.
publisher AMER INST PHYSICS
issn 0021-8979
year published 2015
volume 118
issue 7
digital object identifier (doi) 10.1063/1.4927816
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000360441900017
  ciceco authors
  impact metrics
journal analysis (jcr 2017):
journal impact factor 2.176
5 year journal impact factor 2.163
category normalized journal impact factor percentile 60.616
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg