Damage model for diffusion-induced structural degradation of metal-ion battery
Damage model for diffusion-induced structural degradation of metal-ion battery
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DOI：
10.1016/j.est.2021.103748
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发表时间：
2022-01
影响因子：
9.4
通讯作者：
Fuqian Yang
中科院分区：
文献类型：
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作者：
Fuqian Yang
了解锂离子电池和钠离子电池等金属离子电池的结构耐久性和安全性，对于电动汽车和混合动力汽车的应用具有重要的实际意义。本文采用损伤力学的方法，引入各向同性损伤状态变量，对电极在电化学循环过程中的变形进行了分析。损伤状态变量的演化依赖于化学反应、反应释放的热和电极的应力状态，并且电极材料的弹性常数和摩尔体积隐含地依赖于损伤状态变量。假设高阶扩散组分浓度和扩散通量对结构损伤/退化的贡献可以忽略不计，我们提出了一个近似的损伤状态表达式，该表达式对应于各个插入和脱嵌过程的单个循环。假设应力对扩散成分的插入/扩散的影响可以忽略不计，我们分析了在第一次插入过程中电极梁弯曲的结构损伤/退化的影响。数值结果表明，结构损伤/退化降低了电极梁可以达到的最小曲率半径。存在由扩散组分的插入引入的扩散弯矩的损伤诱导的释放。
Understanding structural durability and safety of metal-ion batteries, such as lithium-ion battery and sodium-ion battery, is of practical importance for applications in electric vehicles and hybrid electric vehicles. Following the method used in damage mechanics, we introduce an isotropic damage state variable in the deformation analysis of electrode during electrochemical cycling. The evolution of the damage state variable is dependent on chemical reaction, reaction-released heat, and stress state of the electrode, and the elastic constants and the molar volume of the electrode material are dependent implicitly on the damage state variable. Provided that the contribution of higher orders of the concentration of diffusive constituent and diffusion flux to the structural damage/degradation is negligible, we propose an approximated expression for the damage states corresponding to individual cycle for respective insertion and de-insertion process. Assuming negligible effect of stress on insertion/diffusion of diffusive constituent, we analyze the effect of structural damage/degradation on the bending of an electrode beam during the first insertion. The numerical results reveal that the structural damage/degradation reduces the minimum radius of curvature that an electrode beam can reach. There exists the damage-induced relief of the diffusion-bending moment that is introduced by the insertion of the diffusive constituent.