Chemical rate phenomenon approach applied to lithium battery capacity fade estimation

This paper deals about a lithium battery capacity aging model based on Dakin's degradation approach. A 15 Ah commercial lithium-ion battery based on graphite/iron-phosphate technology was used for this purpose and aged at nine different conditions. In fact, the effect on aging of temperature (30, 45, and 60 °C) and battery state of charge (30, 65, and 100%) is studied. The Dakin's degradation approach based on chemical kinetics is used to establish the battery aging law. The aging rate expression is then deduced and found equivalent to Eyring's law. The aging rate increases exponentially with rising temperature and SOC. Model simulation is compared with experiment, literature and results are discussed.