Accelerated Degradation Assessment of 18650 Lithium-Ion Batteries

Power fade of lithium cells due to accelerated factors of temperature and charging-discharging rate was assessed. A lithium-ion battery aging model for predicting the power fade of 18650-size cells was applied, and then statistically accelerated degradation tests were performed to validate the model. The experimental results show that the higher temperature and charging-discharging rate lead more aging effects resulted in power degradation apparently. Validation of the empirical aging model by the experimental data depicts that the model is capable of predicting battery charging-discharging cycles at a specific condition with respect to temperature and charging-discharging rate combination if power degradation rate of the cell is defined.