Li Diffusion in LixCoO2 Probed by Muon-Spin Spectroscopy
Li Diffusion in LixCoO2 Probed by Muon-Spin Spectroscopy
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DOI：
10.1103/physrevlett.103.147601
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发表时间：
2009-10-02
影响因子：
8.6
通讯作者：
Watanabe, Isao
中科院分区：
文献类型：
--
作者：
Sugiyama, Jun;Mukai, Kazuhiko;Watanabe, Isao
用介子自旋弛豫（mu+SR）研究了锂离子（D-Li）在电池材料LixCoO2中的扩散系数。在温度高达400 K的纵向零场和弱场实验的基础上，我们确定了场与核矩相互作用对μ子的波动率（nu）。结合磁化率数据和静电势计算，在150k以上检测到明显的Li+离子扩散。从nu估计的D-Li与第一性原理计算的预测非常吻合，我们提出mu+SR技术是检测含有磁性离子的材料的D-Li的最佳探针。
The diffusion coefficient of Li+ ions (D-Li) in the battery material LixCoO2 has been investigated by muon-spin relaxation (mu+SR). Based on experiments in zero and weak longitudinal fields at temperatures up to 400 K, we determined the fluctuation rate (nu) 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 similar to 150 K. The D-Li estimated from nu was in very good agreement with predictions from first-principles calculations, and we present the mu+SR technique as an optimal probe to detect D-Li for materials containing magnetic ions.