Cycle ageing analysis of a LiFePO4/graphite cell with dynamic model validations: Towards realistic lifetime predictions
2014; Elsevier BV; Volume: 275; Linguagem: Inglês
10.1016/j.jpowsour.2014.10.153
ISSN1873-2755
AutoresE. Sarasketa-Zabala, I. Gandiaga, Egoitz Martinez-Laserna, Lide M. Rodriguez‐Martínez, I. Villarreal,
Tópico(s)Advanced Battery Materials and Technologies
ResumoThe 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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