Effect of Pre-Oxidation of Electrospun Polyvinylpyrrolidone-Derived CoxP/C Composite Nanofibers on their Electrochemical Performance as Anode in Lithium-Ion Batteries

Authors

  • S. Berikbaikyzy National Laboratory Astana, Nazarbayev University, Kabanbay Batyr Ave. 53, Astana, Kazakhstan; School of Engineering and Digital Sciences, Nazarbayev University, Kabanbay Batyr Ave. 53, Astana, Kazakhstan
  • Y. Sagynbay National Laboratory Astana, Nazarbayev University, Kabanbay Batyr Ave. 53, Astana, Kazakhstan
  • G. Turarova National Laboratory Astana, Nazarbayev University, Kabanbay Batyr Ave. 53, Astana, Kazakhstan
  • I. Taniguchi Department of Chemical Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan
  • Zh. Bakenov National Laboratory Astana, Nazarbayev University, Kabanbay Batyr Ave. 53, Astana, Kazakhstan; School of Engineering and Digital Sciences, Nazarbayev University, Kabanbay Batyr Ave. 53, Astana, Kazakhstan
  • A. Belgibayeva National Laboratory Astana, Nazarbayev University, Kabanbay Batyr Ave. 53, Astana, Kazakhstan; School of Engineering and Digital Sciences, Nazarbayev University, Kabanbay Batyr Ave. 53, Astana, Kazakhstan

DOI:

https://doi.org/10.18321/ectj1498

Keywords:

Lithium-ion batteries, Electrospinning, Conversion-based anodes, Phosphides, Pre-oxidation

Abstract

This research studies the effect of pre-oxidation on physical and electrochemical properties of electrospun polyvinylpyrrolidone (PVP)-derived carbon composites of cobalt phosphides by comparing carbonized non-pre-oxidized (NPO) and pre-oxidized (PO) samples used as anode materials for lithium-ion batteries. The X-Ray diffraction (XRD) patterns revealed the formation of CoP and Co2P in both samples while presence of amorphous cobalt metaphosphate for NPO and cobalt phosphate for PO was determined by X-ray photoelectron spectroscopy (XPS). The electrochemical performance of nanofibers was evaluated by cyclic voltammetry and galvanostatic charge-discharge at different current densities. The results showed improved stability at high current densities (344.1 mAh g-1 at 5000 mA g-1), more significant charge capacity (599.6 mAh g-1 at 500 mA g-1) and higher initial Coulombic efficiency (CE%, 61.1%) for PO samples than NPO.

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Published

2023-07-15

How to Cite

Berikbaikyzy, S., Sagynbay, Y., Turarova, G., Taniguchi, I., Bakenov, Z., & Belgibayeva, A. (2023). Effect of Pre-Oxidation of Electrospun Polyvinylpyrrolidone-Derived CoxP/C Composite Nanofibers on their Electrochemical Performance as Anode in Lithium-Ion Batteries. Eurasian Chemico-Technological Journal, 25(2), 81–87. https://doi.org/10.18321/ectj1498

Issue

Vol. 25 No. 2 (2023)

Section

Articles

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