Abstract
The transportation characteristics of Li+ in the active materials significantly affect the life and overall performance of lithium-ion cells. Analyzing the relationship between electrode thickness and heat/mass-related characteristics is thus very important for lithium-ion cells. The objective of this study was to investigate the effect of electrode thickness on the cell performance by developing a precise one-dimensional electrochemical–thermal coupled model with experimental validation. The thermal and heat-generation characteristics were investigated firstly. Then, the effects of the electrode thickness on the short-term and long-term electrochemical performance of lithium-ion cells were also explored experimentally and numerically from the perspectives of Li+ transport characteristics and discharging behaviors. The results indicated that the electrode thickness had a significant influence on the cell performance. Firstly, the cell with a thicker electrode showed a lower voltage plateau and an earlier stopping of the discharging process compared with the cell with a thinner electrode during a single discharging test; meanwhile, the cell with a thicker electrode presented a faster capacity degradation rate in the long-term cyclic tests. These influences were explained through the Li+ transportation mechanism and the electrochemical–thermal coupled effect.
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Funding
This work was supported by the project of Natural Science Foundation of Gansu Province (Grant No. 20JR10RA193, Grant No. 18JR3RA141), National Natural Science Foundation of China (Grant No. 51806093), Doctoral Research Funds of Lanzhou University of Technology (Grant No. 061907).
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An, Z., Zhao, Y., Shi, T. et al. Modeling and experimental analysis of the thermal and electrochemical characteristics of lithium-ion cells with different electrode thickness. Ionics 28, 719–732 (2022). https://doi.org/10.1007/s11581-021-04365-7
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DOI: https://doi.org/10.1007/s11581-021-04365-7