Browsing by Author "Petrov T.I."

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    AN EFFECT OF THE ELEMENTAL COMPOSITION ON THE ELECTROCHEMICAL BEHAVIOR OF ALLOYED (Co-Sn, Ni-Sn) NANOPOWDERS IN A Li-ION BATTERY
    (2020-01-01) Markova-Deneva I.; Petrov T.I.; Piskin M.B.; Zahariev I.Z.; Milanova V.L.
    Alloyed Co-Sn and Ni-Sn nanopowders are synthesized at a room temperature through a borohydride reduction with NaBH4 in a mixture of aqueous solutions of the relevant chloride salts (CoCl2.6H2O, NiCl2.6H2O and SnCl2.2H2O) at mass ratios of the metallic components chosen in accordance with the corresponding binary systems phase diagrams (Co:Sn = 35:65, Ni:Sn = 45:65). Intermetallic Co-Sn and Ni-Sn nanoparticles are obtained applying a template technique which involves the use of a carbon support such as graphite (CF) and a carbon powder (CP). As a result, carbon nanocomposites are prepared in-situ. The samples obtained are electrochemically tested as anodes in a three-electrode half cell (a Li-ion battery). Their electrochemical characteristics such as specific capacity, cyclability, and efficiency are evaluated. The investigated electrode materials based on the synthesized intermetallic Co-Sn and Ni-Sn nanoparticles and their carbon nanocomposites exhibit a different electrochemical behavior depending on their morphology, microstructure, their elemental and phase composition. Based on the capacity, the cyclability, and the efficiency observed it can be concluded that Co-Sn (Co:Sn = 35:65) and Ni-Sn (Ni:Sn = 45:55) nanoparticle’s powders and their carbon composites are promising electrode materials. CF and CP used as carriers in a template synthesis of intermetallic nanoparticles are suitable matrices for the preparation of nanocomposite electrode materials of improved electrochemical parameters. The resulting carbon nanocomposite materials based on Co-Sn and Ni-Sn nanoparticles exhibit more stable electrochemical characteristics compared to those of the synthesized Co-Sn and Ni-Sn alloys. They are characterized by a higher initial discharge capacity and better cycling stability after the 10th cycle and are suitable alternative of the graphite anodes in the Li-ion batteries. The investigation carried out verifies the effect of the elemental composition on the electrochemical behavior of the investigated intermetallic (Co-Sn, Ni-Sn) nanopowders.