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Nano Research 2019, 12(4): 911-917 https://doi.org/10.1007/s12274-019-2322-y
Research Article | Issue | Published: 07 March 2019

Phase-pure Na3V2(PO4)2F3 embedded in carbon matrix through a facile polyol synthesis as a potential cathode for high performance sodium-ion batteries

Show Author's Information Sohyun Park1,  Jinju Song2,  Seyeon Kim1,  Balaji Sambandam1,  Vinod Mathew1,  Sungjin Kim1,  Jeonggeun Jo1,  Seokhun Kim1,  Jaekook Kim1( )
Department of Materials Science and Engineering,Chonnam National University, 300 Yongbong-dong, Buk-gu,Gwangju,500-757,Republic of Korea;
Gwangju Bio/Energy R & D Center,Korea Institute of Energy Research (KIER), 270-25 Samso-ro, Buk-gu,Gwangju,61003,Republic of Korea;
Keywords:
sodium ion batteries, fluorophosphate, Na3V2(PO4)2F3, polyol process, long life stability
Topics:
CarbonHigh resolution transmission electron microscopyMetal ionsScanning electron microscopy
Cite this article:
Park S, Song J, Kim S, et al. Phase-pure Na3V2(PO4)2F3 embedded in carbon matrix through a facile polyol synthesis as a potential cathode for high performance sodium-ion batteries. Nano Research, 2019, 12(4): 911-917. https://doi.org/10.1007/s12274-019-2322-y
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Abstract Full text Electronic supplementary material About this article

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.


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About this article

Phase-pure Na3V2(PO4)2F3 embedded in carbon matrix through a facile polyol synthesis as a potential cathode for high performance sodium-ion batteries

Show Author's information Sohyun Park1, Jinju Song2, Seyeon Kim1, Balaji Sambandam1, Vinod Mathew1, Sungjin Kim1, Jeonggeun Jo1, Seokhun Kim1, Jaekook Kim1( )
Department of Materials Science and Engineering,Chonnam National University, 300 Yongbong-dong, Buk-gu,Gwangju,500-757,Republic of Korea;
Gwangju Bio/Energy R & D Center,Korea Institute of Energy Research (KIER), 270-25 Samso-ro, Buk-gu,Gwangju,61003,Republic of Korea;

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.

Keywords: sodium ion batteries, fluorophosphate, Na3V2(PO4)2F3, polyol process, long life stability

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Publication history
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Acknowledgements

Publication history

Received: 16 November 2018
Revised: 16 January 2019
Accepted: 29 January 2019
Published: 07 March 2019
Issue date: April 2019

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Acknowledgements

Acknowledgemets

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2017R1A2A1A17069397). This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2018R1A5A1025224).

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