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Lithium iron phosphate (LiFePO_4) doped with magnesium was hydrothermally synthesized from commercial LiOH,FeSO_4, H_3PO_4 and MgSO_4 with glucose as carbon precursor in aqueous solution.The samples were characterized by X-ray powder diffraction,scanning electron microscopy and constant charge-discharge cycling.The results show that the synthesized powders have been in situ coated with carbon precursor produced from caramel reaction of glucose.At ambient temperature (28±2℃),the electrochemical performances of LiFePO_4 prepared exhibit the high discharge capacity of 135 mAh g~(-1) at 5C and good capacity retention of 98% over 90 cycles.The excellent electrochemical performances should be correlated with the intimate contact between carbon and LiFePO_4 primary and secondary particles,resulting from the in situ formation of carbon precursor/carbon, leading to the increase in conductivity of LiFePO_4.
Lithium iron phosphate (LiFePO 4) doped with magnesium was hydrothermally synthesized from commercial LiOH, FeSO 4, H 3 PO 4 and MgSO 4 with glucose as carbon precursor in aqueous solution. These samples were characterized by X-ray powder diffraction, scanning electron microscopy and constant charge-discharge cycling The results show that the synthesized powders have been in situ coated with carbon precursor produced from caramel reaction of glucose. At ambient temperature (28 ± 2 ° C), the electrochemical performances of LiFePO_4 prepared exhibit the high discharge capacity of 135 mAh g ~ ( -1) at 5C and good capacity retention of 98% over 90 cycles. The excellent electrochemical performances should be correlated with the intimate contact between carbon and LiFePO 4 primary and secondary particles, resulting from the in situ formation of carbon precursor / carbon, leading to the increase in conductivity of LiFePO_4.