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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Li Ion Dynamics in a LiAlO2 Single Crystal Studied by ~7Li NMR Spectroscopy and Conductivity Measurements
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Li Ion Dynamics in a LiAlO2 Single Crystal Studied by ~7Li NMR Spectroscopy and Conductivity Measurements

机译:〜7Li NMR光谱和电导率测量研究LiAlO2单晶中的锂离子动力学

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摘要

Dynamics of lithium ions in solid materials is a key parameter for applications such as electrode materials for lithium ion batteries. The Li diffusion in single crystalline γ-LiAlO2 was studied with temperature-dependent ~7Li NMR spectroscopy and conductivity measurements. The NMR measurements include a detailed study of the temperature dependence of static spectra and spin-lattice relaxation rate measurements. A combination of these methods allowed us to study diffusion coefficients over a range of more than seven decades. The range covered was 10~(-20) to 10~(-13) m~2 s~(-1) corresponding to jump rates between 10~0 and 10~7 s~(-1) An activation energy of about 1 eV was found. The hopping between crystallographically equivalent Li sites was explicitly verified by coalescence of quadrupole satellites in the NMR spectra.
机译:固体材料中锂离子的动力学是诸如锂离子电池电极材料等应用的关键参数。利用温度依赖性〜7Li NMR光谱和电导率测量研究了单晶γ-LiAlO2中的Li扩散。 NMR测量包括对静态光谱的温度依赖性和自旋晶格弛豫速率测量的详细研究。这些方法的组合使我们能够研究超过七十年的扩散系数。涵盖的范围是10〜(-20)到10〜(-13)m〜2 s〜(-1),对应于10〜0到10〜7 s〜(-1)之间的跳跃速率。活化能约为1发现eV。晶体学上等价的Li位点之间的跃迁已通过NMR光谱中四极卫星的合并而明确证实。

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