Fe-doped V₂O₅layered nanowire cathode material with high lithium storage performance

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Vanadium pentoxide (V₂O₅) is a promising cathode material for lithium-ion batteries due to its high theoretical capacity.
• However, its practical application is hindered by structural instability and poor electrical conductivity.

Purpose of the Study:

• To enhance the electrochemical performance of V₂O₅ as a lithium-ion battery cathode material.
• To investigate the effect of iron (Fe) doping on the structure and properties of V₂O₅.

Main Methods:

• Synthesis of Fe-doped V₂O₅ nanowires with diameters of 200-300 nm using electrostatic spinning.
• Electrochemical testing of the 3Fe-V₂O₅ electrode in a lithium-ion battery setup.

Main Results:

• The 3Fe-V₂O₅ electrode achieved a high initial capacity of 436.9 mAh g^-1, significantly exceeding the theoretical capacity of V₂O₅ (294 mAh g^-1).
• A stable capacity of 312 mAh g^-1 was maintained after 50 cycles.
• The enhanced performance is attributed to the layered nanowire structure and improved electrical conductivity due to Fe-doping.

Conclusions:

• Fe-doping and the layered nanowire structure effectively improve the capacity and cycling stability of V₂O₅ cathodes.
• Electrostatic spinning is a viable technique for producing homogeneous, nanosized, and doped V₂O₅ materials for advanced lithium-ion batteries.