Preparation of Spherical Nanocrystal LiFePO4 and Li4Ti5O12aa and a¤Investigation of the LiFePO4/Li4Ti5O12aa Cell

The spherical nanocrystal LiFePO4/C and Li4Ti5O12/C are synthesized a viaa °controlled crystallization ± and °outer gel ± technics, respectively. XRD, SEM, BET testing and the determination of the electrochemical properties show that the LiFePO4/C and Li4Ti5O12/C particles are spherical nanocrystals. The products exhibit great specific surface area. The tap-densities of spherical LiFePO4/C and Li4Ti5O12aa/C powders are as high as a 1.25aa and a 1.71g/cma 3, respectively. The initial discharge specific capacities of the LiFePO4/C a and Li4Ti5O12/C reach a 144.0 and 144.2mAh/g at 1Ca rate. The materials also exhibit excellent cycle performance. A 1.8 V lithium-ion battery composed of LiFePO4/C and Li4Ti5O12/C shows a quite flat operating voltage of 1.8V with excellent cycleability.a¤