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A parameter study of intercalation of lithium into storage particles in a lithium-ion battery

机译：锂嵌入锂离子电池储能颗粒中的参数研究

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The effect of stress on storage particles within a lithium ion battery, while acknowledged, is not fully understood. In this study we identify three non-dimensional parameters which govern the stress response within a spherical storage particle, and we carry out numerical simulations to characterize the stresses that are developed. The non-dimensional parameters are developed using system properties such as the diffusion coefficient, particle radius, lithium partial molar volume and Young's modulus. Stress maps are generated for various values of these parameters for fixed rates of insertion, with boundary conditions applied to particles similar to those found in a battery. Stress and lithium concentration profiles for various values of these parameters show that the coupling between stress and concentration is magnified depending on the values of the parameters. The resulting maps can be used for different materials, depending on the value of the dimensionless parameters. Finally, the value of maximum stress generated is calculated for extraction of lithium from the particle and compared with those generated during insertion.
机译：尽管人们公认，应力对锂离子电池内存储颗粒的影响尚不完全清楚。在这项研究中，我们确定了控制球形存储颗粒内应力响应的三个无量纲参数，并进行了数值模拟来表征所产生的应力。使用系统特性（例如扩散系数，粒子半径，锂部分摩尔体积和杨氏模量）开发无量纲参数。对于固定插入速率，将针对这些参数的各种值生成应力图，并且将边界条件应用于类似于电池中发现的粒子的边界条件。这些参数的各种值的应力和锂浓度曲线表明，应力和浓度之间的耦合取决于参数的值而被放大。根据无量纲参数的值，生成的贴图可用于不同的材质。最后，计算产生的最大应力值以从颗粒中提取锂，并将其与插入过程中产生的应力进行比较。

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