A High Precision Study of the Coulombic Efficiency of Li-Ion Batteries

The capacity loss and coulombic efficiency of , , and commercial Li-ion batteries have been examined using high precision coulometry. The cells were charged and discharged at different C rates and temperatures to observe trends in the aging of cells. The experiments show that time, not cycle count, is the dominant contributor to the coulombic inefficiency of Li-ion batteries cycled at low rates.