Abstract
Co3O4/Nitrogen doped carbon (Co3O4/NDC) composite is successfully prepared using 1-butyl-3-methylimidazolium dicyanamide ([BMIm]N(CN)2) as carbon and nitrogen sources. The properties of Co3O4/NDC composite and bare Co3O4 are systematically characterized by X-ray diffraction, Raman spectrum, transmission electron microscopy (TEM), and scanning electron microscopy. TEM result indicates that the Co3O4 particles are coated with a layer of nitrogen doped carbon film, with can enhance its conductivity and alleviate the volume effect. The results of electrochemical tests show that the discharge specific capacity of Co3O4/NDC composite is 1088 mAh g−1 of 0.1 C (1 C = 890 mA g−1) after 100 cycles. Compared to Co3O4/NDC composite, the discharge specific capacity of bare Co3O4 is 628 mAh g−1 of 0.1 C after 100 cycles. The enhanced electeochemical properties can be attributed to the nitrogen doped carbon film that prevents the structure from being destroyed during lithium ion (Li+) insertion/deinsertion process and improves the conductivity.
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