Effect of Pre-Oxidation of Electrospun Polyvinylpyrrolidone-Derived Cox P/C Composite Nanofibers on their Electrochemical Performance as Anode in Lithium-Ion Batteries
Berikbaikyzy S. Sagynbay Y. Turarova G. Taniguchi I. Bakenov Z. Belgibayeva A.
15 July 2023Institute of Combustion Problems, al-Farabi Kazakh State National University
Eurasian Chemico-Technological Journal
2023#25Issue 281 - 87 pp.
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 Co2 P 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.
Conversion-based anodes , Electrospinning , Lithiumion batteries , Phosphides , Pre-oxidation
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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
Department of Chemical Science and Engineering, Tokyo Institute of Technology, Tokyo, 152-8552, Japan
National Laboratory Astana
School of Engineering and Digital Sciences
Department of Chemical Science and Engineering
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