Effect of the Charge Process and Discharge Rate on the Lithium Stripping Process Visibility in LiFePO4-Graphite Li-ion Cells during Charge-Discharge Cycling at 0°C

Abstract

Commercially available 18650 LiFePO4-Graphite Li-ion cells were exposed to charge-discharge cycling at 0°C following two different charge methods: constant current-constant voltage (CC-CV) and constant current (CC), and two different discharge rates: 1 C and 0.2 C. The effect of the charge method and discharge rate on the cell performance was analyzed. The cell exposed to CC charge and 1 C discharge-rate showed a high voltage plateau at the beginning of the discharge voltage, while a high voltage plateau was not observed in the discharge profiles of the cells exposed to a discharge rate of 0.2 C.

Keywords

• li-ion cells
• low temperature
• lithium plating