mSR Study on Battery Materials

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  • リチウム電池のµ<sup>+</sup>SR研究
  • ミュオン科学 リチウム電池のμ⁺SR研究
  • ミュオン カガク リチウム デンチ ノ m ⁺ SR ケンキュウ

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Abstract

We review the muon spin relaxation (μ+SR) work on battery materials to estimate a self-diffusion coefficient (D) of Li+ and Na+ ions, which is one of the most predominant parameters to determine the charge and discharge rate of batteries. Since the initial muon spin polarization of the surface muon beam is 100％ polarized, μ+SR detects the internal magnetic field(s) in materials even in zero applied field. Using this feature, we can separate the nuclear magnetic field from the electron magnetic field, leading to the measurements of D in materials containing magnetic ions. This is a significant advantage over NMR. In fact, D’s of Li+ and Na+ in several AMxOy (A=Li or Na, M=Mn, Fe, Co, Ni, …) compounds were successfully determined with μ+SR. Furthermore, we show that such information on D provides other significant parameters, such as, the carrier density, reactive surface area, and diffusion pathway in battery materials. Finally, we will give a prospect of the future research using a depth-resolved muon beam.

Journal

  • RADIOISOTOPES

    RADIOISOTOPES 65 (4), 191-199, 2016

    Japan Radioisotope Association

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