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Nanoscale phase stability in Li ion battery anode materials

机译：锂离子电池负极材料的纳米级相稳定性

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摘要

A thermodynamic model was developed in particular for nanocrystalline partially ionic solids, which represent a group of Li ion battery anode materials. The lithium compounds were used as examples to demonstrate the model applications in studies of phase stability and phase transformation behavior in the nanoscale anode system. The peritectic and eutectic transformations were described systematically concerning the reaction temperatures and liquid concentrations at various equilibria, in which the grain size effects on the equilibrium, stability and transformation of Li-containing phases were quantified. To verify the model predictions, a series of experiments were performed using the nanocrystalline Li-Si system as sample materials. The experimental finding confirmed the model calculations, based on which the correlation of phase stability, temperature, grain size and critical grain size was proposed.
机译：特别是针对代表一组锂离子电池负极材料的纳米晶体部分离子固体的热力学模型。以锂化合物为例，证明了该模型在研究纳米级阳极体系的相稳定性和相变行为方面的应用。系统地描述了在各种平衡状态下反应温度和液体浓度的包晶和共晶转变，其中晶粒大小对含锂相的平衡，稳定性和转变的影响进行了定量。为了验证模型预测，使用纳米晶锂硅系统作为样品材料进行了一系列实验。实验结果证实了模型计算，并在此基础上提出了相稳定性，温度，晶粒尺寸和临界晶粒尺寸的相关性。

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