Effect of heterogeneous dual carbon sources on electrochemical properties of LiMn0.8Fe0.2PO4/C composites
LiMn0.8Fe0.2PO4/C composite was synthesized using sucrose and graphite as heterogeneous carbon sources through a solid-state method assisted by aqueous rheological phase.The effect of different addition methods of graphite on electrochemical performances was studied.The LiMn0.8Fe0.2PO4/C composite was characterized by the X-ray diffraction(XRD),N2 adsorption-desorption,scanning electron microscopy(SEM),and transmission electron microscopy(TEM).The results showed that different graphite coating processes had obvious effects on the structure and electrochemical properties of the materials.The sample,which the graphite was added after the precursor was calcined,showed a high purity and uniform elliptic morphology.And its specific discharge capacity was 149 mAh· g-1(87％of the theoretical specific capacity)at 0.1C.The specific discharge capacity was 133 mAh·g-1 at 5C.After 300 cycles at 2C,its capacity was maintained at 127 mAh·g-1,whose decay rate was 1.9％,showing excellent elec-trochemical performances.
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