The interfacial peeling strength of lithium-ion battery electrodes is a very important mechanical property that significantly affects the electrochemical performance of battery cells. To characterize the interfacial peeling strength of an electrode, an analytical model based on the energy balance principle is established by considering the state of charge (SOC), the energy release rate, the tensile stiffness, and the peeling angle. Uniaxial tensile tests and 180-degree peeling tests are conducted to determine the Young’s modulus and the interfacial peeling strengths of electrodes at different SOCs, respectively. The experimental data serve as a validation of the accuracy of the analytical model. The interfacial peeling strength of the electrode shows a strong reliance on many factors. Specifically, the interfacial peeling strength increases with the SOC and the energy release, and decreases with the peeling angle. When the tensile stiffness of the active layer equals that of the current collector, the interfacial peeling strength has a maximum value. By comparing with experimental data of the 180-degree peeling test, the model prediction shows excellent agreement at different SOCs, and the analytical model established in this paper can be used to guide and assess the interfacial properties of electrodes for industry.

中文翻译：

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电极界面剥离强度的解析模型与实验验证

锂离子电池电极的界面剥离强度是非常重要的力学性能，对电池的电化学性能有显着影响。为了表征电极的界面剥离强度，考虑荷电状态（SOC）、能量释放率、拉伸刚度和剥离角，建立了基于能量平衡原理的分析模型。进行单轴拉伸试验和180度剥离试验，分别测定不同SOC下电极的杨氏模量和界面剥离强度。实验数据用于验证分析模型的准确性。电极的界面剥离强度表现出对多种因素的强烈依赖。具体来说，界面剥离强度随着SOC和能量释放的增加而增加，随着剥离角度的增加而减小。当活性层的拉伸刚度等于集电器的拉伸刚度时，界面剥离强度具有最大值。通过与180度剥离试验的实验数据对比，模型预测在不同SOC下表现出极好的一致性，本文建立的分析模型可用于指导和评估工业电极的界面性能。