Paper Title
Dependence of The Electrochemical Behavior of Intermetallic (Co-Sn) Nanoparticles and Their Carbon Nanocomposites on The Elemental Composition

Abstract
Alloyed Co-Sn nanopowders are synthesized at room temperature through a borohydride reduction with NaBH4 in a mixture of aqueous solutions of the relevant chloride salts (CoCl2.6H2O and SnCl2.2H2O) at a mass ratio of Co:Sn=35:65, as well as interemtallic Co-Sn nano-particles are obtained applying a template technique using a graphite support. As a result carbon nano-composites are prepared in-situ. The obtained samples are electrochemically tested by a cycling voltammetry as electrodes (anodes) in Li-ion batteries. Their charac-teristics such as specific capacity, cyclability, and efficiency are evaluated. The investigated electrode materials based on the synthesized intermetallic Co-Sn nanoparticles and their carbon nanocomposites exhibit a different electrochemical behavior depending on their morphology, microstructure and respectively their elemental and phase composition. Based on the measured electrochemical characteristics the Co-Sn (Co:Sn=35:65) nanoparticles and their carbon composites are good electrode materials. The higher Sn content compared to the Co content results in high capacity. The graphite (CF) used as a carrier for the template synthesis of intermetallic nanoparticles is a suitable matrix for the preparation of new nanocomposite electrode materials with improved electrochemical parameters. The resulting carbon nanocomposite mate-rials based on Co-Sn nanoparticles and graphite matrix exhibit better electrochemical characteristics compared to synthesized pure Co-Sn nanosized alloys. The carbon-nanocomposites are characterized by a higher initial discharge capacity and better cycling stability after the 10th cycle and are suitable for electrode materials (anodes), alternatives to graphite electrodes in Li-ion batteries. Index Terms - Intermetalllic Nanoparticles, Nanocom-Posites, Cycling Voltammetry, Specific Capacity, Cyclability, Efficiency.