Shear-lag model of diffusion-induced buckling of core-shell nanowires
Shear-lag model of diffusion-induced buckling of core-shell nanowires
复制标题
核壳纳米线扩散诱发屈曲的剪切滞后模型
DOI：
10.1088/0022-3727/49/28/285602
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Yang Fuqian
中科院分区：
文献类型：
--
作者：
Li Yong;Zhang Kai;Zheng Bailin;Yang Fuqian
锂离子电池（LIB）电化学循环过程中的锂化和脱锂会在电极活性材料中引入局部变形，导致活性材料中局部应力和应变的演变。了解与活性材料中锂化引起的变形相关的结构退化是实现锂离子电池中使用的活性材料结构优化的重要步骤之一。降解模式有多种，包括膨胀、破裂和屈曲，特别是对于锂离子电池中使用的纳米线和纳米棒。在这项工作中，剪切滞后模型和扩散诱导应力理论用于研究锂化过程中扩散诱导的核壳纳米线的屈曲。纳米线开始屈曲的临界载荷随着纳米线长度的增加而降低。表面电流密度越大，达到纳米线开始屈曲的临界负载的时间越短。
The lithiation and de-lithiation during the electrochemical cycling of lithium–ion batteries (LIBs) can introduce local deformation in the active materials of electrodes, resulting in the evolution of local stress and strain in the active materials. Understanding the structural degradation associated with lithiation-induced deformation in the active materials is one of the important steps towards structural optimization of the active materials used in LIBs. There are various degradation modes, including swelling, cracking, and buckling especially for the nanowires and nanorods used in LIBs. In this work, a shear-lag model and the theory of diffusion-induced stress are used to investigate diffusion-induced buckling of core–shell nanowires during lithiation. The critical load for the onset of the buckling of a nanowire decreases with the increase of the nanowire length. The larger the surface current density, the less the time is to reach the critical load for the onset of the buckling of the nanowire.