@article{Park2019, 
author = {Sohyun Park and Jinju Song and Seyeon Kim and Balaji Sambandam and Vinod Mathew and Sungjin Kim and Jeonggeun Jo and Seokhun Kim and Jaekook Kim},
title = {Phase-pure Na3V2(PO4)2F3 embedded in carbon matrix through a facile polyol synthesis as a potential cathode for high performance sodium-ion batteries},
year = {2019},
journal = {Nano Research},
volume = {12},
number = {4},
pages = {911-917},
keywords = {fluorophosphate, Na3V2(PO4)2F3, polyol process, sodium ion batteries, long life stability},
url = {https://www.sciopen.com/article/10.1007/s12274-019-2322-y},
doi = {10.1007/s12274-019-2322-y},
abstract = {In this study, a pseudo-layered Na super-ionic conductor of Na3V2(PO4)2F3  (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 P42/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)2F3/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)2F3/C cathode retains the specific discharge capacities of 108.4 and 105.9 mAh·g–1, respectively, revealing the structural stability of the material prepared through a facile polyol refluxing method.}
}