Lithium diffusion in LiMnPO4 detected with mu +/- SR
Journal article, 2020

Positive- and negative-muon spin rotation and relaxation (mu(+/-) SR) was first used to investigate fluctuations of nuclear magnetic fields in an olivine-type battery material, LiMnPO4, in order to clarify the diffusive species, namely, to distinguish between a mu(+) hopping among interstitial sites and Li+ ions diffusing in the LiMnPO4 lattice. Muon diffusion can only occur in mu+SR, because the implanted mu(-) forms a stable muonic atom at the lattice site, and therefore any change in linewidth measured with mu-SR must be due to Li+ diffusion. Since the two measurements exhibit a similar increase in the field fluctuation rate with temperature above 100 K, it is confirmed that Li+ ions are in fact diffusing. The diffusion coefficient of Li+ at 300 K and its activation energy were estimated to be 1.4(3) x 10(-10) cm(2)/s and 0.19(3) eV, respectively. Such combined mu(SR)-S-+/- measurements are thus shown to be a suitable tool for detecting ion diffusion in solid-state energy materials.

Author

Jun Sugiyama

High Energy Accelerator Research Organization

Comprehensive Research Organization for Science and Society (CROSS)

Japan Atomic Energy Agency

Ola Kenji Forslund

Royal Institute of Technology (KTH)

Elisabetta Nocerino

Royal Institute of Technology (KTH)

Nami Matsubara

Royal Institute of Technology (KTH)

Konstantinos Papadopoulos

Chalmers, Physics, Materials Physics

Yasmine Sassa

Chalmers, Physics, Materials Physics

Stephen P. Cottrell

STFC Rutherford Appleton Laboratory

Adrian D. Hillier

STFC Rutherford Appleton Laboratory

Katsuhiko Ishida

RIKEN

Martin Mansson

Royal Institute of Technology (KTH)

Jess H. Brewer

TRIUMF

University of British Columbia (UBC)

Physical Review Research

26431564 (ISSN)

Vol. 2 3 033161

Subject Categories

Inorganic Chemistry

Materials Chemistry

Other Chemical Engineering

DOI

10.1103/PhysRevResearch.2.033161

More information

Latest update

4/21/2023