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A comparison of lithium diffusion between Graphite/LFP 18650 power and energy cells with low and high current pulses
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| Author(s) |
William WHEELER, Damien VOYER |
| Abstract |
This study gives a new estimation model to evaluate the voltage-increase due to a step-up current in both lithium-ion power and energy cells. The step-up current analysis is similar to the GITT technic developed in the literature, but with tests at low or high C-rate and for a longer time. The power cell voltage-increase follows a square root of time dependency which is commonly observed in the literature. On the contrary, a superimposed transient overvoltage in the energy cell is observed. The transient overvoltage has the capacity to distort the characterization of diffusion as modelled by existing models. This paper proposes a phenomenological approach to model the transient overvoltage in the energy cell. This work gives a method to model the phenomenon and is a first step to clarify the origin of the phenomenon. It can also help improving the estimation of the diffusion parameters. |
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| Filename: | 0248-epe2025-full-17552459.pdf |
| Filesize: | 547.6 KB |
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| Type |
Members Only |
| Date |
Last modified 2025-08-31 by System |
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