Vanadium oxide and its composite materials are ideal electrode materials for lithium-ion batteries.A carbon microspheres/porous VO2(B) composite material was synthesized using one-step hydrothermal method.The structure,morphology,and electrochemical properties of the composite material were characterized and tested using X-ray diffraction,scanning electron microscopy,and battery testing systems.The results showed that carbon microspheres/porous VO2(B) composite material was composed of amorphous carbon microspheres and porous VO2(B) self-constructed from flexible bent VO2(B) nanobelts.When the current densities were 0.5A/g,1A/g,2A/g,and 5A/g,the discharge specific capacities could reach 748.4mAh/g,612.2mAh/g,457.5mAh/g,and 359.6mAh/g,respectively.After 250 cycles,the capacity retention rate could reach 90.7% (at 5A/g).
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基金资助
河南省科学院科研开发专项项目(220609099)
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