The effect of heat preservation time on the electrochemical properties of LiFePO₄

LiFePO₄ was prepared via high temperature solid-state method at different heat preservation time. XRD and SEM was used to test the structure and morphology of LiFePO₄. Land 2001 was used to test the electrochemical performance of LiFePO₄. The results illustrated that well-crystallized LiFePO₄ composite with homogeneous small particles was obtained by XRD and SEM. And the optimum heat preservation time was 4 hour. From charge/discharge test, it can be seen that at 0.2C, LiFePO₄ has initial discharge capacities of 159.1mAh/g at the heat preservation time 4 hour. From the rate capacity, it can be seen that the discharge capacity was of optimum sample remains above 99% after 200 cycles. (paper)