Effects of Thermal Annealing on the Li+ Intercalation Properties of V2O5·nH2O Xerogel Films
| Autor: | Huamei Shang, Ying Wang, Tammy P. Chou, Guozhong Cao |
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| Rok vydání: | 2005 |
| Předmět: |
Diffraction
Thermogravimetric analysis Materials science Intercalation (chemistry) Thermal treatment Electrochemistry medicine.disease Surfaces Coatings and Films Characterization (materials science) Chemical engineering Materials Chemistry medicine Dehydration Physical and Theoretical Chemistry Current density |
| Zdroj: | The Journal of Physical Chemistry B. 109:11361-11366 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp051275+ |
| Popis: | V2O5·nH2O xerogel films with n = 1.6, 0.6, and 0.3 have been prepared from the sol−gel route by reacting V2O5 with H2O2 followed by drying under ambient conditions and thermal annealing at 110 and 250 °C, respectively. After dehydration, V2O5 crystallizes at 300−330 °C, as revealed by thermal gravimetric analysis and X-ray diffraction. Electrochemical characterization demonstrated that V2O5·0.3H2O film exhibits the best Li+ intercalation performance, with an initial capacity of 275 mAh/g and a stabilized capacity of 185 mAh/g under a high current density of 100 μA/cm2 after 50 cycles. Under a low current density of 10 μA/cm2, the capacity of this film can reach 390 mAh/g. Such an enhanced electrochemical property by thermal treatment is ascribed to the reduced water content, the retained interlayer spacing, and the dominant amorphous phase in the film. |
| Databáze: | OpenAIRE |
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