期刊
RSC ADVANCES
卷 4, 期 22, 页码 11375-11383出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra47878e
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资金
- NNSF of China [51134007, 21003161, 21250110060]
- Program for the New Century Excellent Talents in University [NCET-11-0513]
- Funds for Distinguished Young Scientists of Hunan Province, China [13JJ1004]
- Fundamental Research Funds for Central South University [2013zzts159, 2012zzts059]
- Innovation and Entrepreneurship Training Program of China for University Students
Na3V2(PO4)(2)F-3 with a NASICON-type structure is shown to be synthesised with the particle surface found to be coated with amorphous carbon with its thickness in the range of 25-32 nm. The crystallographic planes (hkl) are labelled according to Density Functional Theory (DFT) calculations towards the as-prepared Na3V2(PO4)(2)F-3. The performances of Na3V2(PO4)(2)F-3 have been investigated in lithium-and sodium-ion batteries, exhibiting a specific capacity of 147 mA h g(-1) with an average discharge plateau around 4 V vs. Li+/Li, and 111.5 mA h g(-1) with three discharge plateaus in sodium-ion batteries. A predominant Li ion insertion mechanism is verified by comparing the redox potentials from CV and charge/discharge curves. It is found that the main migration from/into the crystallographic sites of Na3V2(PO4)(2)F-3 of Li ions is favoured to obtain satisfactory properties by a two-step process, while the Na ions are found to require three steps. The stable and three-dimensional open framework of Na3V2(PO4)(2)F-3 is considered to be vital for the excellent C-rate and cycling performances, as well as the fast ion diffusion with a magnitude of 10(-11) cm(2) s(-1), which could demonstrate that Na3V2(PO4)(2)F-3 is a multifunctional dual cathode for both lithium and sodium ion batteries and capable to be a promising candidate in the construction of high-energy batteries.
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