Analysis for performance degradation mechanisms of the retired LiFePO4/graphite power cells

In this work, the performance degradation mechanism of the retired power cells is investigated after 400 and 800 cycles at 25 °C and 45 °C to determine whether they satisfy the secondary utilization requirement under the simulated energy storage systems. The results confirm that the capacity of retired cells show a linear relationship with cycle number. When the cycle numbers are more than 2400 times (at 25 °C), the capacity of the retired cells...