Study on Fabrications and Storage Capacity of Coal Tar Pitch Based V₂O₃@C Composite Materials

抄録

The coal tar pitch based V₂O₃@C composite materials were successfully fabricated by a hydrothermal method using the V₂O₅, H₂C₂O₄·2H₂O and coal tar pitches dissolved in water. It is observed that changing the dosages of coal tar pitches dissolved in water can lead to the various carbon contents in V₂O₃@C composite materials, resulting in the V₂O₃@C composite materials possessing different electrochemical performances. As a result, when the carbon content is adjusted to 42.7 %, the prepared V₂O₃@C-2.0 shows more excellent electrochemical performances than other prepared V₂O₃@C composite materials. For instance, the V₂O₃@C-2.0 exhibits the high Li⁺ storage capacity at 580.2 mAh g⁻¹, after charge-discharge was carried out 100 cycles at 0.1 A g⁻¹. Surprisingly, the V₂O₃@C-2.0 still shows the Li⁺ storage capacity at 234 mAh g⁻¹, after 500 cycles at 5.0 A g⁻¹. The prepared V₂O₃@C composite materials show an excellent industrial application perspective because coal tar pitches are the generally industrial crude materials.