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.
引用
收藏
页码:911 / 917
页数:7
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