Quantifying microstructural dynamics and electrochemical activity of graphite and silicon-graphite lithium ion battery anodes View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2016-09-27

AUTHORS

Patrick Pietsch, Daniel Westhoff, Julian Feinauer, Jens Eller, Federica Marone, Marco Stampanoni, Volker Schmidt, Vanessa Wood

ABSTRACT

Despite numerous studies presenting advances in tomographic imaging and analysis of lithium ion batteries, graphite-based anodes have received little attention. Weak X-ray attenuation of graphite and, as a result, poor contrast between graphite and the other carbon-based components in an electrode pore space renders data analysis challenging. Here we demonstrate operando tomography of weakly attenuating electrodes during electrochemical (de)lithiation. We use propagation-based phase contrast tomography to facilitate the differentiation between weakly attenuating materials and apply digital volume correlation to capture the dynamics of the electrodes during operation. After validating that we can quantify the local electrochemical activity and microstructural changes throughout graphite electrodes, we apply our technique to graphite-silicon composite electrodes. We show that microstructural changes that occur during (de)lithiation of a pure graphite electrode are of the same order of magnitude as spatial inhomogeneities within it, while strain in composite electrodes is locally pronounced and introduces significant microstructural changes. More... »

PAGES

12909

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/ncomms12909

DOI

http://dx.doi.org/10.1038/ncomms12909

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1038053659

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/27671269


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