Comparison of fresh and aged lithium iron phosphate cathodes using a tailored electrochemical strain microscopy technique

Electrochemical strain microscopy (ESM) is a powerful atomic force microscopy (AFM) mode for the investigation of ion dynamics and activities in energy storage materials. Here we compare the changes in commercial LiFePO cathodes due to ageing and its influence on the measured ESM signal. Additionall...

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Bibliographic Details
Published in:Beilstein journal of nanotechnology 2020-04, Vol.11 (1), p.583-596
Main Authors: Simolka, Matthias, Kaess, Hanno, Friedrich, Kaspar Andreas
Format: Article
Language:English
Subjects:
activity
ageing
Aging
Atomic force microscopy
cathode
Cathodes
Electric fields
electrochemical strain microscopy (esm)
Electrolytes
Energy storage
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Graphite
Ion dynamics
lifepo4
Lithium
Nanoscience
Nanotechnology
Phase transitions
Scanning electron microscopy
Spectrum analysis
Thin films
Topography
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Summary:Electrochemical strain microscopy (ESM) is a powerful atomic force microscopy (AFM) mode for the investigation of ion dynamics and activities in energy storage materials. Here we compare the changes in commercial LiFePO cathodes due to ageing and its influence on the measured ESM signal. Additionally, the ESM signal dynamics are analysed to generate characteristic time constants of the diffusion process, induced by a dc-voltage pulse, which changes the ionic concentration in the material volume under the AFM tip. The ageing of the cathode is found to be governed by a decrease of the electrochemical activity and the loss of available lithium for cycling, which can be stored in the cathode.
ISSN:2190-4286
2190-4286
DOI:10.3762/bjnano.11.46