Boosting High-Rate Lithium Storage of V2O5Nanowires by Self-Assembly on N-Doped Graphene Nanosheets
| Autor: | Xiao-Dong Zhu, Du-Juan Yan, Cai-Yu Qu, Yujie Feng, Kening Sun, Shiru Le, Yi-Tao Liu, Xiao-Tian Gao |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Graphene Heteroatom Graphene foam Doping Nanowire chemistry.chemical_element Nanotechnology 02 engineering and technology Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences law.invention chemistry law Electrochemistry Lithium 0210 nano-technology Graphene nanoribbons |
| Zdroj: | ChemElectroChem. 3:1730-1736 |
| ISSN: | 2196-0216 |
| DOI: | 10.1002/celc.201600305 |
| Popis: | V2O5 is a promising cathode material for lithium-ion batteries owing to its extremely high theoretical capacity (440 mA h g−1 when storing 3 Li+ ions and 294 mA h g−1 when storing 2 Li+). However, drawbacks such as a strong inclination to aggregate and the low conductivity inherent to nanostructured V2O5 drastically deteriorate its cycle and rate performances. Hence, hybridizing it with a conductive matrix (e.g. graphene) for improved electrochemical performance is an interesting concept. It is well established that heteroatom functionalization (e.g. N doping) can tailor the chemical properties of graphene by influencing the neighboring carbon atoms to enhance conductivity and electrochemical activity. Herein, a high-rate cathode material is fabricated by self-assembly of V2O5 nanowires on N-doped graphene nanosheets, followed by heat treatment to optimize the electrochemical performance. The synergistic effects of the resulting V2O5/N-doped graphene nanohybrids are demonstrated by their excellent rate capability: they deliver very high capacities of 273, 242, 206, 181, and 161 mA h g−1 at current densities of 100, 200, 500, 1000, and 2000 mA g−1. |
| Databáze: | OpenAIRE |
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