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Understanding Lithium Inventory Loss and Sudden Performance Fade in Cylindrical Cells during Cycling with Deep Discharge Steps

E.Sarasketa-Zabala, F.Aguesse, I.Villarreal, L.M. Rodríguez-Martínez, C.M.López, and P.Kubiak

ELSEVIER :Journal of Power Sources Volume 275, February 2015, Pages 573–587


The present investigation work compares cycling ageing behaviour upon constant operation conditions (static tests) with degradation under non-constant schemes (dynamic tests), through a novel methodology for ageing model dynamic validation. A LFP-based Li-ion cell performance loss is analysed using a DOD and C-rate stress factors Ah-throughput-domain characterisation method, and represented using a semi-empirical model. The proposed stepwise validation approach enables assessing the static ageing tests acceleration factor and systematically improving the ageing model. The result is a simple but comprehensive model. The predictions root-mean-square error, under dynamic cycling operation conditions, is just 1,75 %

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