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Alkali metal insertion in hard carbon - the full picture

Abstract

Carbon-based anodes are technologically highly relevant for Li and post-Li ion batteries. While the storage mechanism of Li in graphite is essentially understood, the alkali metal intercalation in carbon derivatives has been strongly debated. Here, we present a combined computational and experimental study on the intercalation of Li and Na in hard carbon, elaborating on the impact of the different alkali metals on the storage mechanism. Our results give strong evidence that the intercalation of Li and Na in hard carbon follow the same route and, moreover, show that in operando Raman scattering is a sensitive and powerful tool for characterizing the intercalation mechanism in carbon based materials. In fact, by exploiting the so-called double resonance, even information on the electronic structure can be obtained. Finally, theoretical predictions for the insertion mechanism of K are presented.

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Supplementary files

Article information


Submitted
11 May 2020
Accepted
23 Jun 2020
First published
30 Jun 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Paper

Alkali metal insertion in hard carbon - the full picture

H. Euchner, B. P. Vinayan, A. R. Munnangi, M. Fichtner and A. Gross, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/D0TA04868B

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