Cu0.04V2O5 was prepared by a precipitation method followed by heat treatment at 300 and 600 °C. The material prepared at 300 °C showed porous morphology, whereas that prepared at 600 °C was highly crystalline. X-ray diffraction, Raman scattering and Fourier transform infrared spectroscopy showed both materials exhibiting the same structure as that of V2O5, with a slight lattice expansion. X-ray absorption spectroscopy confirmed the presence of V4+ cations in Cu0.04V2O5, which would increase the electronic conductivity of V2O5. Cu0.04V2O5 showed better electrochemical performance than V2O5 because of its high electronic conductivity and good structural stability. The material prepared at 600 °C delivered a reversible discharge capacity over 160 mAh g-1 after 60 cycles at a C rate of C/5.6. The material prepared at 300 °C showed good high-rate performance, which delivered a reversible capacity ∼100 mAh g-1 when cycled at C/1.9. The discrepancy in the rate performance of Cu0.04V2O5 was attributed to the morphology of materials.
Bibliographical noteFunding Information:
This work was supported by the Ministry of Education and Human Resources Development, the Ministry of Commerce, Industry and Energy and the Ministry of Labor through the fostering project of the Lab of Excellency and by the Ministry of Information and Communication of KOREA (Support Project of University Information Technology Research Center supervised by KIPA). Partial work was supported by the special funds for major state basic research project (973) of China under the Grant 2002CB211802.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering