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Understanding Capacity Loss in LFP/Graphite Pouch Cells at High Temperature through Modelling Modelling innovation: A novel “AB” model was proposed to interpret capacity loss incurred by lithium inventory loss and transition metal dissolution. This model directly reflects the dynamics of SEI growth rate as a function of SEI thickness and Fe dissolution from the cathode. Constant-rate (linear) iron dissolution, assumed by the model, is validated via chemical analysis of aged cells. Mechanism reflection: Through the “AB” modelling of the capacity vs time of LFP/graphite cells, it is reaffirmed SEI growth and the effects associated with transition metal deposition as the predominant mechanisms of capacity fade in LFP/graphite cells cycling at higher temperatures
“AB” MODEL
CAPACITY LOSS INTERPRETATION Model 1: Q(t) = Q0(1-At1/2)
Model 2: Q(t) = Q0(1-A(1+Bt)t1/2) A: lithium inventory loss to SEI growth B: iron deposition to accelerate inventory loss
Source: Black et al, Journal of The Electrochemical Society, 2025, 172, 090503
Observation: Fitted curves using model 2 are shown superimposed on the absolute capacity loss plots Conclusion: In LFP/graphite cells, Li inventory loss due to SEI growth, accelerated by transition metal deposition, is the predominant degradation mode
A comprehensive look at the performance of the LFP pouch cells introduced above showing the absolute capacity loss, normalized capacity loss, and voltage polarization at 40, 55, and 70 °C.
Extracted from the PDF; charts and images may read imperfectly.
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