Facile Synthesis of MoO3 Nanobelts with Carbon Dispersed Structure and Its Application As Anode of Lithium Ion Batteries
The prepared MoO3/C nanobelts are systematically characterized by XRD, FTIR, TGA, SEM, TEM, and EDS techniques, and the electrochemical performance is investigated by CV and constant current discharge-charge test techniques.
XRD analysis reveals that the as-synthesized material is α-MoO3. The addition of activated carbon has no influence on the crystal structure of α-MoO3. The peak positions of MoO3/C are as same as the pure MoO3, indicating that the existence of carbon does not affect the lattice structure of MoO3. FTIR analysis confirms the presence of carbon in the composite. The carbon content in MoO3/C composite was determined to be about 7.85% on the basis of the TGA analysis. The MoO3 and MoO3/C samples are investigated as anode materials for LIBs. When tested at a current density of 100 mA g-1 between 0.01-3.0 V, the MoO3/C anode exhibits a much better cycling performance than the MoO3 anode, delivering a higher discharge capacity of ~1000 mAh g-1 after 50 cycles. In contrast, the capacity of pure MoO3 decreased continuously with the increasing number of cycles, only remains 632 mAh g-1 after 50 cycles. The improved cycling performance of MoO3/C can be attributed to the presence of activated carbon, which improves electronic conductivity. Moreover, the activated carbon prevents MoO3 nanobelts agglomeration and acts as a sponge for relieving the large volume change during cycling, thus further enhance the structural stability.
In summary, α-MoO3 nanobelts with carbon dispersed structure can be fabricated through a one-pot hydrothermal method. When evaluated as anode materials for LIBs, the MoO3/C exhibit exceptional high specific capacity and outstanding rate capability The results suggested this kind of composite could become a promising candidate for anode materials of high-performance lithium ion batteries.
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