Many promising candidate electrode materials suffer from severe voltage decay, which is detrimental to lithium ion battery performance. Recently, the relationship between stress-mediated chemical potential and voltage variation has received much attention. While, how the plastic deformation affects the voltage variation remains unclear. A stress coupled phase field reaction model is employed to reveal the mechanism for the stress-related voltage decay accompanied by plastic deformation, wherein different lithiation behaviors under electrochemical reactions are considered. It is demonstrated that hydrostatic compression on the surface is responsible for the stress-induced voltage decay, and the plastic deformation can mitigate the voltage decay via not only relaxing the hydrostatic compression, but also changing hydrostatic compression on the surface to be hydrostatic tension under the small yield stress. In addition, under the same yield stress, two-phase lithiation process is prone to trigger the plastic deformation compared to the single phase lithiation process, facilitating to elevate the output voltage. Further, compared to the circular particle, the interconnected particle can improve the output voltage through the favorable transition from hydrostatic compression to hydrostatic tension at the interconnected region and the surface with large curvature.

许多有希望的候选电极材料遭受严重的电压衰减，这对锂离子电池的性能有害。近年来，应力介导的化学势与电压变化之间的关系备受关注。然而，尚不清楚塑性变形如何影响电压变化。应力耦合相场反应模型用于揭示伴随塑性变形的应力相关电压衰减的机理，其中考虑了电化学反应下的不同锂化行为。结果表明，表面上的静水压缩是应力引起的电压衰减的原因，塑性变形不仅可以通过放松静水压缩来减轻电压衰减，而且在很小的屈服应力下，改变表面的静水压力成为静水压力。另外，在相同的屈服应力下，两相锂化过程相比单相锂化过程更容易触发塑性变形，从而有利于提高输出电压。此外，与圆形颗粒相比，互连颗粒可以通过在互连区域和具有大曲率的表面上从静水压缩到静水张力的良好过渡来改善输出电压。