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Experimental Visualization of Commercial Lithium Ion Battery Cathodes: Distinguishing Between the Microstructure Components Using Atomic Force Microscopy

journal contribution
posted on 10.09.2020 by JS Terreblanche, DL Thompson, IM Aldous, J Hartley, AP Abbott, Karl S Ryder
The integration of lithium-ion batteries (LIB) into transportation through the implementation of hybrid and electric vehicles is driving fundamental research into improving their performance and lifetime. The rapid production of new electric vehicles by several popular brands also raises the question of how much material will eventually need to be reused or recycled. With a combination of an enhanced fundamental analysis of commercially utilized electrodes with fundamental chemical knowledge, answers to the scientific material challenges of lithium ion batteries will aid in not only the implementation of battery powered electrical transport but also the development of end of life recycling processes. Here, using quantitative nanomechanical and conductive atomic force microscopy, which are nondestructive and rapid techniques, the different components of the composite electrode are unveiled at the nanoscale, identifying the mechanism by which the active material binds together and how the conductive network is formed. Changes in the polymer binder network are observed in an aged cell and are shown to affect the mechanical integrity of the electrode structure, which can lead to the failure of the electrode. The links between nanomechanical and macro-mechanical properties were evaluated using a scratch test and optical microscopy to show that the mechanical integrity of the aged cell was weaker than that of the untouched cell.

History

Citation

Journal of Physical Chemistry C, 2020, 124, 27, 14622–14631

Author affiliation

School of Chemistry

Version

AM (Accepted Manuscript)

Published in

Journal of Physical Chemistry C

Volume

124

Issue

27

Pagination

14622 - 14631

Publisher

American Chemical Society

issn

1932-7447

eissn

1932-7455

Acceptance date

09/06/2020

Copyright date

2020

Available date

16/06/2021

Language

English

Publisher version

https://pubs.acs.org/doi/10.1021/acs.jpcc.0c02713

Exports