Structure and electrochemical charge-discharge properties of Ni–Co–C nanocomposites

Keywords

metal-carbon nanocomposites, nickel, cobalt, negative electrode material, electrochemical properties.

Cite as

Vlad Kh. I., Verbovytskyy Yu. V., Bogatyrov V. M., and Zavaliy I. Yu. Structure and electrochemical charge-discharge properties of Ni–Co–C nanocomposites. Physicochemical Mechanics of Materials. 2022. 58(6), 096-102.

Abstract

Composites based on nickel, cobalt and carbon were investigated as bonding materials for the production of negative electrodes of nickel-metal hydride (Ni–MH) batteries. The structure and electrochemical properties of Ni–C, Co–C and NiCo–C nanocomposites synthesized by the pyrolysis method from polystyrene and metal salts were studied. Its crystal structure was established by X-ray powder diffraction, and the dependence of morphology on the chemical composition of the composite was shown by scanning elec­tron microscopy. Electrochemical properties demonstrated that the Ni–C nanocomposite had good cyclic stability (92% in the 40^th cycle), and Co–C had a high discharge capacity (330 mA·h/g). The hydrogenation and dehydrogenation processes which corresponded to the main charge-discharge reactions were confirmed by the linear potential sweep method.

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