Nanostructured V2O5/Nitrogen-doped Graphene Hybrids for High Rate Lithium Storage
| Autor: | Gaind P. Pandey, Kayla Strong, Lamartine Meda, Yiqun Yang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Graphene Mechanical Engineering Vanadium chemistry.chemical_element Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Cathode 0104 chemical sciences Nanoclusters law.invention chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials law Ionic conductivity Pentoxide General Materials Science 0210 nano-technology Ethylene glycol |
| Zdroj: | MRS Advances. 3:3495-3500 |
| ISSN: | 2059-8521 |
| Popis: | Vanadium Pentoxide (V2O5) has been identified as a potential cathode material owning to its high specific capacity, theoretically, 441 mAh g-1 for 3Li+ ions insertion/extraction. However, the intrinsic drawbacks of V2O5, i.e. structural instability and poor electronic and ionic conductivity, greatly inhibit its application as a cathode. Here, we report a cetyltrimethylammonium bromide (CTAB)-assisted hydrothermal reaction to synthesize V2O5 nanoclusters. Unique aggregated fiber structure was obtained after annealing. To achieve a porous structure and increase the conductivity, nitrogen-doped Graphene (NG) suspended in ethylene glycol was added to the reaction mixture. The obtained spherical V2O5 nanoparticles and NG sheets were randomly dispersed in the matrix of the V2O5 spheres. As a cathode material for lithium-ion batteries, the V2O5/NG hybrids demonstrate better rate performance compared to the bundle-like V2O5 fibers, delivering higher specific capacity of ~ 300 and 150 mAh g-1 at a rate of C/10 and 5C, respectively. The enhanced performance in lithium storage are attributed to the synergistic effect of the nanostructured V2O5/NG composites. |
| Databáze: | OpenAIRE |
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