Muon studies of Li+ diffusion in LiFePO4 nanoparticles of different polymorphs

Ashton, T. E., Laveda, J. V., MacLaren, D. A. , Baker, P. J., Porch, A., Jones, M. O. and Corr, S. A. (2014) Muon studies of Li+ diffusion in LiFePO4 nanoparticles of different polymorphs. Journal of Materials Chemistry A, 2(17), pp. 6238-6245. (doi:10.1039/c4ta00543k)

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Abstract

The lithium diffusion in nanostructured olivine LiFePO4 has been investigated for the first time using muon spectroscopy (μSR). A microwave-assisted approach has been employed for nanoparticle preparation, where the choice of solvent is shown to play an important role in determining particle morphology and crystal chemistry. Two phases have been obtained: Pnma LiFePO4 and the high pressure Cmcm phase. The Li+ diffusion behaviour is strikingly different in both phases, with DLi of 6.25 × 10−10 cm2 s−1 obtained for Pnma LiFePO4 in good agreement with measurements of bulk materials. In contrast, Li+ diffusion is impeded with the addition of the high pressure Cmcm phase, with a lower DLi of 3.96 × 10−10 cm2 s−1 noted. We have demonstrated an efficient microwave route to nanoparticle synthesis of positive electrode materials and we have also shown μSR measurements to be a powerful probe of Li+ diffusion behaviour in nanoparticles.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Corr, Professor Serena and MacLaren, Dr Donald
Authors: Ashton, T. E., Laveda, J. V., MacLaren, D. A., Baker, P. J., Porch, A., Jones, M. O., and Corr, S. A.
College/School:College of Science and Engineering > School of Chemistry
College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Materials Chemistry A
Publisher:Royal Society of Chemistry
ISSN:2050-7488
ISSN (Online):2050-7496
Copyright Holders:Copyright © 2014 The Royal Society of Chemistry
First Published:First published in Journal of Materials Chemistry A 2(17):6238-6245
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
643201Microwave processing for fast, green preparation of insertion electrodesSerena CorrEngineering & Physical Sciences Research Council (EPSRC)EP/K029290/1SCHOOL OF CHEMISTRY