Flower-Like VO2(B)@C Structure: High Rate Capacity and Stability as Lithium-Ion Batteries
| Autor: | Li Bikui, Liu Xuan, Wang Pengbo, Yafei Zhang, Lu Yao, Xianghong Kong |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Nanostructure
Materials science Biomedical Engineering chemistry.chemical_element Bioengineering 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry Hydrothermal circulation Ion Crystallinity chemistry Chemical engineering General Materials Science Lithium Nanorod 0210 nano-technology Current density |
| Zdroj: | Journal of Nanoscience and Nanotechnology. 19:4052-4057 |
| ISSN: | 1533-4880 |
| DOI: | 10.1166/jnn.2019.16325 |
| Popis: | In this report, we describe flower-like VO₂(B)@C nanostructures, which exhibit spherical particles on radially protruding nanorods and are synthesized through a mild hydrothermal approach. Improved electrochemical performance can be easily acquired by controlling the amount of the sucrose. When the amount of sucrose is 0.32 g, the first discharge capacity of VO₂(B)@C nanostructures reaches 238.9 mAh g-1. At a high current density of 2000 mA g-1, flower-like VO₂(B)@C nanostructures exhibit 2.5-fold higher capacity than VOX without sucrose. As the rate is reduced to 100 mA g-1, a high discharge capacity of 144.4 mAh g-1 (79% of the original capacity) is recovered, manifesting good rate reversibility. This performance is derived from the unique flower-like structural feature with low crystallinity, which could significantly suppress irreversible Li+ trapping and improve Li+ diffusion kinetics. The well discharge capacity and capacity retention show that VO₂(B)@C has considerable potential for use in industry applications. |
| Databáze: | OpenAIRE |
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