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

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.