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<p>Tin (Sn)-based alloys are among the most promising candidates as alternative anode materials for lithium-ion batteries (LIBs). In this study, cobalt-tin (Co-Sn) alloys were obtained by an electrodeposition method on a Cu foil substrate from a polyligand citrate–chloride electrolyte. The effect of the chemical composition and thickness of the alloys on their electrochemical characteristics as anode material for LIBs is investigated. The tested Co-Sn alloy electrodes exhibit an initial specific capacity from 474 to 606 mAh g<sup>–1</sup> at a current density of 100 μA cm<sup>–2</sup>. It was found that an increase in the thickness/mass loading and saturation of the Co-Sn alloy with Sn leads to a higher tendency for structural degradation, resulting in a more rapid decrease in specific capacity during cycling. The thinner Co-Sn electrodes with the thickness up to 1.2&#xa0;μm demonstrate good cyclability with 75% of capacity retention after 70–80 cycles and exhibit excellent rate capability with discharge current densities of up to 20,000&#xa0;mA&#xa0;g⁻<sup>1</sup>. The change in the kinetic properties of lithium ions in the alloy electrode during cycling has been studied.</p>

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Electrodeposited Co-Sn alloys as anode materials for lithium-ion batteries

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • Yurii V. Shmatok,
  • Nataliya I. Globa,
  • Oleksii A. Vyshnevskyi,
  • Eugen A. Babenkov,
  • Vasyl M. Nikitenko,
  • Valeriy S. Kublanovsky

摘要

Tin (Sn)-based alloys are among the most promising candidates as alternative anode materials for lithium-ion batteries (LIBs). In this study, cobalt-tin (Co-Sn) alloys were obtained by an electrodeposition method on a Cu foil substrate from a polyligand citrate–chloride electrolyte. The effect of the chemical composition and thickness of the alloys on their electrochemical characteristics as anode material for LIBs is investigated. The tested Co-Sn alloy electrodes exhibit an initial specific capacity from 474 to 606 mAh g–1 at a current density of 100 μA cm–2. It was found that an increase in the thickness/mass loading and saturation of the Co-Sn alloy with Sn leads to a higher tendency for structural degradation, resulting in a more rapid decrease in specific capacity during cycling. The thinner Co-Sn electrodes with the thickness up to 1.2 μm demonstrate good cyclability with 75% of capacity retention after 70–80 cycles and exhibit excellent rate capability with discharge current densities of up to 20,000 mA g⁻1. The change in the kinetic properties of lithium ions in the alloy electrode during cycling has been studied.