共 36 条
Phase-pure Na3V2(PO4)2F3 embedded in carbon matrix through a facile polyol synthesis as a potential cathode for high performance sodium-ion batteries
被引:46
作者:
Park, Sohyun
[1
]
Song, Jinju
[2
]
Kim, Seyeon
[1
]
Sambandam, Balaji
[1
]
Mathew, Vinod
[1
]
Kim, Sungjin
[1
]
Jo, Jeonggeun
[1
]
Kim, Seokhun
[1
]
Kim, Jaekook
[1
]
机构:
[1] Chonnam Natl Univ, Dept Mat Sci & Engn, 300 Yongbong Dong, Gwangju 500757, South Korea
[2] KIER, Gwangju Bio Energy R&D Ctr, 270-25 Samso Ro, Gwangju 61003, South Korea
基金:
新加坡国家研究基金会;
关键词:
fluorophosphate;
Na3V2(PO4)(2)F-3;
polyol process;
sodium ion batteries;
long life stability;
ELECTROCHEMICAL PERFORMANCE;
HIGH-POWER;
ELECTRODE;
NANOPARTICLES;
FAMILY;
D O I:
10.1007/s12274-019-2322-y
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
In this study, a pseudo-layered Na super-ionic conductor of Na3V2(PO4)(2)F-3 (NVPF)/C cathode for sodium-ion batteries is prepared successfully using a facile polyol refluxing process without any impurity phases. The X-ray diffraction and Rietveld refinement results confirm that NVPF possesses tetragonal NASICON-type lattice with a space group of P-42/mnm. In this preparative method, polyol is utilized as a solvent as well as a carbon source. The presence of nanosized NVPF particles in the carbon network is confirmed by field-emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM). The existence of carbon is analyzed by Raman scattering and elemental analysis. When applied as a Na-storage material in a potential window of 2.0-4.3 V, the electrode exhibits two flat voltage plateaus at 3.7 and 4.2 V with an electrochemically active V3+/V4+ redox couple. In addition, Na3V2(PO4)(2)F-3/C composite achieved a retention capacity of 88% even after 1,500 cycles at 15 C. Moreover, at high current densities of 30 and 50 C, Na3V2(PO4)(2)F-3/C cathode retains the specific discharge capacities of 108.4 and 105.9 mAhg(-1), respectively, revealing the structural stability of the material prepared through a facile polyol refluxing method.
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页码:911 / 917
页数:7
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