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APS » Journals » Phys. Rev. Lett. » Volume 103 » Issue 14
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Phys. Rev. Lett. 103, 147601 (2009) [4 pages]

Li Diffusion in LixCoO2 Probed by Muon-Spin Spectroscopy

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Jun Sugiyama1,*, Kazuhiko Mukai1, Yutaka Ikedo1,†, Hiroshi Nozaki1, Martin Månsson2, and Isao Watanabe3
1Toyota Central Research and Development Laboratories Inc., Nagakute, Aichi 480-1192 Japan
2Laboratory for Neutron Scattering, ETH Zürich and Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
3Muon Science Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

Received 16 June 2009; published 30 September 2009

The diffusion coefficient of Li+ ions (DLi) in the battery material LixCoO2 has been investigated by muon-spin relaxation (μ+SR). Based on experiments in zero and weak longitudinal fields at temperatures up to 400 K, we determined the fluctuation rate (ν) of the fields on the muons due to their interaction with the nuclear moments. Combined with susceptibility data and electrostatic potential calculations, clear Li+ ion diffusion was detected above ∼150  K. The DLi estimated from ν was in very good agreement with predictions from first-principles calculations, and we present the μ+SR technique as an optimal probe to detect DLi for materials containing magnetic ions.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.147601
DOI:
10.1103/PhysRevLett.103.147601
PACS:
76.75.+i, 66.30.H−, 82.47.Aa, 82.56.Lz

*e0589@mosk.tytlabs.co.jp

†Present address: Muon Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Japan.

 
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