论文标题
压力诱导的插入不稳定性
Stress-Induced Intercalation Instability
论文作者
论文摘要
我们提出了线性稳定性分析，以证明由溶质（DE）插入到化合物中形成的平坦相干相边界对波长大于临界波长的扰动是不稳定的。该临界波长受界面能量与富含溶质和溶质贫困相之间的不合适引起的弹性应变能之间的竞争控制。它随着化合物的相边界和游离表面之间的距离而增加，因此，当边界在（DE）插入过程的早期阶段靠近表面时，不稳定性最为明显。数值计算表明，这种不稳定性会导致不均匀的插入行为。我们发现，除非相边界以大于临界速度的速度移动，否则无法实现均匀的插入。估计该速度的幅度表明，应力诱导的插际不稳定性通常在用于电池应用的互化化合物中可操作。
We present a linear stability analysis to demonstrate that a flat coherent phase boundary formed by the (de)intercalation of solutes into a compound is unstable against perturbations with wavelengths larger than a critical wavelength. This critical wavelength is controlled by the competition between the interface energy and the elastic strain energy caused by the misfit between the solute-rich and solute-poor phases. It increases with the distance between the phase boundary and free surface of the compound, and so the instability is most pronounced when the boundary is close to the surface at the early stage of the (de)intercalation process. Numerical calculations show that such instability leads to non-uniform intercalation behavior. We find that uniform intercalation cannot be achieved unless the phase boundary moves at a speed greater than a critical velocity. Estimate of the magnitude of this velocity suggests that the stress-induced intercalation instability is generally operative in intercalation compounds used for battery applications.
