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Synthesis by Electrospinning and Electrochemical Properties of Na2Fe2(SO4)3 Nanofibers as a Cathode Material for Sodium-Ion Batteries

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Abstract

Alluaudite-type Na2+2xFe2−x (SO4)3 is a promising cathode material for sodium-ion batteries because of its high voltage, low cost, and feasible synthesis at low temperature. However, it has a low ionic conductivity (1 × 10−7 S/cm) and electrical conductivity (2 × 10−9 S/cm). In this study, we improved the ionic conductivity by using electrospinning to activate ion diffusion. We also improved the electrical conductivity by using poly(vinylpyrrolidone) to form a carbon coating. Scanning electron microscopy revealed that the synthesized material consisted of nanofibers with sizes of approximately 400–800 nm. The surface area was measured by using atomic force microscopy. An X-ray Diffraction analysis was carried out to determine the structure of the Na2Fe2(SO4)3 nanofibers. Additionally, the initial charge-discharge capacities of Na2Fe2(SO4)3 were found to be 22.27 mAh/g and 19.39 mAh/g, respectively, at a current density of 0.1 C-rate.

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Acknowledgments

This study was supported by financial resources granted by the Ministry of SMEs and Startups, Republic of Korea (S2928638) and the National Research Foundation of Korea (NRF) funded by the Korea government (MSIT, No. 2019R1F1A1057220) and by the Technology Innovation Program (or Industrial Strategic Technology Development Program-Material Parts Technology Development Project) (20003747, Development of high-performance cathode material manufacturing technology through valuable metal upcycling from waste battery and waste cathode material) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea) and the Korea Agency for Infrastructure Technology.

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Authors and Affiliations

  1. Department of Nano-Polymer Science & Engineering, Korea National University of Transportation, Chungju, 27469, Korea

    Yun-Chae Nam, Seon-Jin Lee & Jong-Tae Son

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  1. Yun-Chae Nam
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  2. Seon-Jin Lee
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  3. Jong-Tae Son
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Correspondence to Jong-Tae Son.

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Nam, YC., Lee, SJ. & Son, JT. Synthesis by Electrospinning and Electrochemical Properties of Na2Fe2(SO4)3 Nanofibers as a Cathode Material for Sodium-Ion Batteries. J. Korean Phys. Soc. 77, 836–839 (2020). https://doi.org/10.3938/jkps.77.836

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  • DOI: https://doi.org/10.3938/jkps.77.836

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