Effect of low-temperature storing on the performance of Li-ion battery
Understanding the effects of prolonged low-temperature storing on battery cycle performance and aging mechanisms is important for the operation and management of Li-ion battery in low-temperature environments.The batteries are set aside at-40 ℃ and 25 ℃ and are subjected to charge-discharge at 1.00 C rate in 2.30-3.65 V,the above operation is repeated 15 times.The aging behavior of Li-ion battery is analyzed by parameters such as state of health(SOH),electrochemical impedance,differential voltage and incremental capacity curves.Low-temperature storing has a certain influence on SOH of the battery,compared with the control group,the average capacity retention is decreased by 2.04 percentage points,the initial Coulombic efficiency is 97.4％.The Ohmic impedance and charge transfer impedance of the battery increase after low-temperature storing.By analyzing the differential voltage and incremental capacity curves,it is found that the loss of active material and active Li+inside the battery are the main causes of capacity degradation.
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