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
Japan Atomic Energy Agency
Comprehensive Research Organization for Science and Society (CROSS)
High Energy Accelerator Research Organization
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 033161Subject Categories (SSIF 2011)
Inorganic Chemistry
Materials Chemistry
Other Chemical Engineering
DOI
10.1103/PhysRevResearch.2.033161