Abstract
Background
The interfacial peeling strength of lithium-ion battery electrodes is a very important mechanical property that significantly affects the electrochemical performance of battery cells.
Objective
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.
Methods
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.
Results
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.
Conclusions
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.
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Acknowledgements
Authors gratefully acknowledge the financial support of the National Science Foundation of China (No. 11972218 and 11472165).
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Huang, P.Y., Liu, C., Guo, Z.S. et al. Analytical Model and Experimental Verification of the Interfacial Peeling Strength of Electrodes. Exp Mech 61, 321–330 (2021). https://doi.org/10.1007/s11340-020-00651-z
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DOI: https://doi.org/10.1007/s11340-020-00651-z