Electrochemical Properties of Induction Melt Al-Substituted AB5-Type Intermetallics

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Abstract

Intermetallic compounds LaNi5-xAlx (x = 0.1–0.9) were synthesized by the induction melting method. The structure, morphology and phase composition of the obtained intermetallics were determined. It was shown that the intermetallics correspond to the Hauke phase with a hexagonal structure of the CaCu5-type. The electrochemical characteristics of the compounds as negative electrodes of nickel-metal hydride power sources were studied. It was shown that the maximum specific capacity of the electrodes (320 mAh/g) is achieved with an Al content of 0.47 mol per intermetallics formula unit. A direct correlation was established between the composition, specific electrochemical capacity, high-rate dischargeability and cyclic stability of these materials.

About the authors

S. V Shmalii

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences

I. D Shamov

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences

A. N Lapshin

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences

ORCID iD: 0000-0002-2363-2612

V. V Sanin

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences; Laboratory of Metallurgical Processes “Giredmet”

S. A Melnikov

Laboratory of Metallurgical Processes “Giredmet”

B. P Tarasov

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences

ORCID iD: 0000-0002-1062-3063

A. A Volodin

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences

Email: alexvol@icp.ac.ru
ORCID iD: 0000-0001-5555-7322

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