In-situ synthesis of LiFePO4/carbon cauliflower-like by hydrothermal reaction for using in lithium ion batteries

The active cauliflower-like lifepo4 (lfp/cin) material was synthesized with hydrothermal process in the presence of glucose and then calcined at 600 °c. the physical properties,particle size and morphology of obtained samples were investigated with the x-ray diffraction (xrd),scanning electron microscope (sem) and transmission electron microscope (tem). the electrochemical performance of nano-composites was studied by cyclic voltammetry (cv),electrochemical impedance spectroscopy (eis) and galvanostatic cycling performance. the cv curves show that lfp/cin has higher electrochemical reactivity for lithium insertion and extraction than the lfp conventional cathode material. eis measurements demonstrated that rct for lfp/cin is 70 and 50 percent lower compared to lfp and lfp/cex respectively. the initial discharge capacity of lifepo4/cin cathode material delivers about 133.92 mah g−1 (82% of theoretical capacity) at 0.1 c and cycling stability with 96.3% of capacity retention after 40 cycles at 0.1 c. electrochemical tests demonstrate that in-situ carbon coating play an important role in the improvement of battery performance with increasing the conductivity,reduce the particles size and unique structure. © 2017 by cee (center of excellence in electrochemistry).