Silicon is a promising candidate for the negative electrode in lithium-ion battery. However, silicon-based electrodes experience large volume changes during the lithiation-delithiation process, which may lead to their failure and hinder their application. Delamination of the silicon layer from the current collector substrate is one of the critical failure modes; its effects on the performance degradation of Si anode need to be better understood. In this study, a multi-physics based finite element model is established to investigate the impact of Si layer delamination, where an artificial insulating interface is introduced to simulate the delamination phenomenon. It is found that delamination could result in a large amount of residual lithium within Si phase at the end of the delithiation process, leading to the capacity degradation of the Si anode. Furthermore, depth of delamination, Si layer thickness and charging/discharging C-rate are three critical influencing factors for the performances of the Si anode. With the increase of depth of delamination and Si layer thickness, the remaining useful capacity of the Si anode will gradually reduce. In addition, under high C-rate operating conditions, the capacity loss of the anode will be largely exaggerated by the presence of the delamination.

硅是锂离子电池负极的有希望的候选者。然而，硅基电极在锂化-脱锂过程中会发生较大的体积变化，这可能导致其失效并阻碍其应用。硅层与集电器基板的分层是关键的失效模式之一；需要更好地了解其对 Si 阳极性能退化的影响。在这项研究中，建立了一个基于多物理场的有限元模型来研究 Si 层分层的影响，其中引入了人工绝缘界面来模拟分层现象。研究发现，在脱锂过程结束时，脱层会导致硅相内残留大量锂，导致硅负极容量下降。此外，分层深度、Si层厚度和充电/放电C-rate是影响Si负极性能的三个关键因素。随着分层深度和硅层厚度的增加，硅负极的剩余可用容量将逐渐减少。此外，在高倍率操作条件下，阳极的容量损失会因分层的存在而大大增加。