期刊
SCIENCE CHINA-MATERIALS
卷 62, 期 4, 页码 474-486出版社
SCIENCE PRESS
DOI: 10.1007/s40843-018-9342-0
关键词
sodium and lithium ion batteries; cathode materials; fluorophosphates; microwave-assisted refluxing; hierarchical self-assembly
资金
- National Natural Science Foundation of China [21303042, 21875097, 21671096, 21603094]
- Guangdong Special Support for the Science and Technology Leading Young Scientist [2016TQ03C919]
- Basic Research Project of the Science and Technology Innovation Commission of Shenzhen [JCYJ20170412153139454, JCYJ20170817110251498]
Unique hierarchical mulberry-shaped Na3V2(PO4)(2)O2F@C nanocomposite was fabricated by a rapid microwave-assisted low-temperature refluxing strategy. The V(acac)(3) reverse micelle systems in the water-in-oil microemulsions played key roles in forming the self-assembly architectures. The prepared Na3V2(PO4)(2)O2F@C nanoparticles with the anisotropic growth along the [002] direction were in-situ encapsulated in carbon shells, which greatly contribute to fast Na+/e(-) transfer in electrodes. And the self-assemblies with high structure stability help to improve the cycle performance and mitigate voltage fading. The initial discharge capacity of Na3V2(PO4)(2)O2F@C as cathode for sodium ion batteries is about 127.9 mA h g(-1) at 0.1 C. Besides, a high rate performance with a capacity of 88.1 mA h g(-1) at 20 C has been achieved, and the capacity retains 82.1% after 2,000 cycles. In addition, the reaction kinetics and Na+ transportation mechanism of Na3V2(PO4)(2)O2F@C were preliminarily investigated by the ex situ X-ray diffraction, X-ray photoelectron spectroscopy and galvanostatic intermittent titration technique. More interestingly, when coupled with Li, the fabricated hybrid Li/Na-ion batteries also exhibit excellent rate and cycling performances. The proposed rapid refluxing strategy to synthesize mulberry-shaped Na3V2(PO4)(2)O2F@C opens up a new opportunity to develop high-performance electrode materials for the energy storage systems.
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