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

DOI: 10.1038/s41598-018-22435-1 DOI Help

Authors: Ian D. Johnson (University College London (UCL)) , Thomas E. Ashton (University College London) , Ekaterina Blagovidova (University College London) , Glen J. Smales (University College London (UCL); Diamond Light Source) , Mechthild Lübke (University College London) , Peter J. Baker (ISIS Pulsed Neutron and Muon Source) , Serena A. Corr (University of Glasgow) , Jawwad A. Darr (University College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Scientific Reports , VOL 8

State: Published (Approved)
Published: March 2018

Open Access Open Access

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.

Journal Keywords: Batteries; Experimental particle physics

Subject Areas: Chemistry, Mathematics, Energy

Facility: ISIS