Journal
SOLID STATE IONICS
Volume 308, Issue -, Pages 161-166Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2017.06.012
Keywords
Na-ion battery; Na3V2(PO4)(3)/C; Spray drying; Microwave
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Funding
- National Natural Science Foundation of China [21576030, 51304077, U1607127]
- Hunan Provincial Natural Science Foundation of China [2016JJ2092]
- Construct Program of the Key Discipline in Hunan Province of China (Applied Chemistry)
- Open Project Program of Key Laboratory of Preparation and Application of Environmental Friendly Materials (Jilin Normal University), Ministry of Education, China [2017007]
- Opening Project of Material Corrosion and Protection Key Laboratory of Sichuan Province of China [2016CL04]
- Changzhou City Science and Technology Plan Projects [CE20150054]
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Porous spherical Na3V2(PO4)(3)/C composites were synthesized by a spray drying-assisted approach combined with microwave calcinations, and then characterized as cathode materials for sodium-ion batteries. The effect of carbon content on Na3V2(PO4)(3)/C were investigated by X-ray diffraction, scanning electron microscopy, Brunauer Emmet Teller method, charge-discharge test, cyclic voltammetry and electrochemical impedance spectra measurements. The results demonstrate that the Na3V2(PO4)(3)/C composite with 5wt.% carbon exhibits the best electrochemical performance among the as-prepared three Na3V2(PO4)(3)/C samples. It delivers the discharge capacity of 97.9 mAh g(-1), 93.5 mAh g(-1) at 0.2 C and 5 C, respectively. Furthermore, 97.9% of its initial capacity is remained after 500 cycles at a high rate of 5 C. The superior electrochemical performance can be ascribed to the improvement of electronic and ionic conductivity by carbon coating and porous spherical structure.
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