Criterion for insertion-induced microcracking and debonding of thin films
Criterion for insertion-induced microcracking and debonding of thin films
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DOI：
10.1016/j.jpowsour.2010.06.082
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发表时间：
2011
影响因子：
9.2
通讯作者：
Fuqian Yang
中科院分区：
文献类型：
--
作者：
Fuqian Yang
将锂插入锂离子电池的电阳极会导致局部体积膨胀并在材料中产生压应力。为了放松压应力，可能会发生包括微裂纹和局部屈曲在内的结构损坏。利用扩散诱发应力理论和能量原理，建立了弹性薄膜中插入诱发裂纹和屈曲的溶质原子临界浓度与平均损伤尺寸之间的解析关系。数值结果表明，根据实验观察，表面裂纹将优于局部屈曲。对于给定尺寸的局部屈曲，存在一个最小临界浓度，该浓度由膜厚度以及膜的杜普雷常数与杨氏模量之比确定。
The insertion of lithium into electric anode in a lithium-ion battery results in local volume expansion and creates compressive stress in materials. To relax the compressive stress, structural damage including microcracking and local buckling can occur. Using the theory of diffusion-induced stress and the energy principle, analytical relations between the critical concentration of solute atoms and average damage size are established for the insertion-induced cracking and buckling in an elastic film. Numerical results show that surface cracking will prevail over local buckling in accord with experimental observation. For local buckling of a given size, there exists a minimum critical concentration which is determined by the film thickness and the ratio of the Dupré constant to Young's modulus of the film.