Mechanistic insights of Li+ diffusion within doped LiFePO4 from Muon Spectroscopy

Abstract

The Li+ ion diffusion characteristics of V- and Nb-doped LiFePO4 were examined with respect to undoped LiFePO4 using muon spectroscopy (µSR) as a local probe. As little difference in diffusion coefficient between the pure and doped samples was observed, offering DLi values in the range 1.8–2.3 × 10−10 cm2 s−1, this implied the improvement in electrochemical performance observed within doped LiFePO4 was not a result of increased local Li+ diffusion. This unexpected observation was made possible with the µSR technique, which can measure Li+ self-diffusion within LiFePO4, and therefore negated the effect of the LiFePO4 two-phase delithiation mechanism, which has previously prevented accurate Li+ diffusion comparison between the doped and undoped materials. Therefore, the authors suggest that µSR is an excellent technique for analysing materials on a local scale to elucidate the effects of dopants on solid-state diffusion behaviour.

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Item Type:	Article
Authors/Creators:	Johnson, I.D. Ashton, T.E. Blagovidova, E. Smales, G.J. Lubke, M. Baker, P.J. Corr, S.A. https://orcid.org/0000-0002-9303-4220 Darr, J.A.
Copyright, Publisher and Additional Information:	© The Author(s) 2018. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Dates:	Accepted: 23 February 2018 Published (online): 7 March 2018 Published: 7 March 2018
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Chemical and Biological Engineering (Sheffield)
Depositing User:	Symplectic Sheffield
Date Deposited:	01 Jul 2019 11:09
Last Modified:	01 Jul 2019 14:12
Status:	Published
Publisher:	Nature Research
Refereed:	Yes
Identification Number:	10.1038/s41598-018-22435-1
Related URLs:	Author
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:147826

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Mechanistic insights of Li+ diffusion within doped LiFePO4 from Muon Spectroscopy

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