As the typical deformation mode, the bending deformation accompanies the entire useful life of flexible batteries. Due to the coupling of electrochemical processes, this bending behavior can severely damage flexible batteries. Herein, a complete physical model is developed to investigate the effect of bending deformation on flexible thin-film electrodes during the charge/discharge cycle. And the rate-dependent plastic flow in the electrode is modeled based on the evolution of the excess energy stored in the material. Two different bending forms of the flexible thin-film electrode are studied, and the stress and strain spectrums of the electrode during cyclic deformation are thoroughly discussed. The results show that the bending deformation has a significant effect on the evolution of the stress and strain of the electrode. Both constant bending deformation and cyclic bending deformation produce accumulated strain, but for entirely different reasons. The present work sheds light on the physical origin of strain accumulation for the flexible thin-film electrode and provides guidance for material design and the application of flexible batteries.

作为典型的变形模式，弯曲变形伴随着柔性电池的整个使用寿命。由于电化学过程的耦合，这种弯曲行为会严重损坏柔性电池。在此，开发了一个完整的物理模型来研究在充放电循环过程中弯曲变形对柔性薄膜电极的影响。电极中与速率相关的塑性流动是基于存储在材料中的多余能量的演变来建模的。研究了柔性薄膜电极的两种不同弯曲形式，深入讨论了电极在循环变形过程中的应力和应变谱。结果表明，弯曲变形对电极应力应变的演化有显着影响。恒定弯曲变形和循环弯曲变形都会产生累积应变，但原因完全不同。目前的工作阐明了柔性薄膜电极应变积累的物理起源，并为材料设计和柔性电池的应用提供了指导。