Scholarlink

<p>High-performance magnesium (Mg) batteries require advanced electrode materials with improved conductivity, stability, and ion transport. In this study, iron (Fe)-doped vanadium disulfide (VSy@Fe) is synthesized via a one-step in-situ hydrothermal method with 5 at% Fe incorporation. Fe doping reduces the bandgap from 1.85&#xa0;eV to 1.42&#xa0;eV, enhances electrical conductivity by ~ 35%, and modifies the layered structure, promoting efficient Mg²⁺ diffusion. VSy@Fe delivers an initial discharge capacity of 210 mAh g⁻¹ at 50&#xa0;mA g⁻¹, compared to 145 mAh g⁻¹ for pristine VSy, and retains 82% capacity after 100 cycles. Cyclic voltammetry and electrochemical impedance spectroscopy reveal a decrease in charge transfer resistance from 78 Ω (VSy) to 32 Ω (VSy@Fe), confirming improved kinetics. Thermal stability is enhanced, with a 20&#xa0;°C increase in decomposition temperature. In halogen-free electrolytes, VSy@Fe shows superior initial capacity retention, although prolonged cycling indicates partial ion transport limitations, suggesting further optimization is required. These findings highlight VSy@Fe as a promising cathode material for next-generation Mg-ion batteries with improved performance and stability.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Fe-doped VSy (y = 2 or 4) for magnesium energy storage: improved conductivity, stability, and electrochemical performance

  • 期刊论文

  • 发表日期：

    2026年3月11日

查看全文
  • M. Alahmadi,
  • Talaat A. Hameed,
  • Engy El-Dek,
  • Moukhtar A. Hassan,
  • Ibrahim S. Yahia,
  • M. M. El-Desoky,
  • Eslam Sheha

摘要

High-performance magnesium (Mg) batteries require advanced electrode materials with improved conductivity, stability, and ion transport. In this study, iron (Fe)-doped vanadium disulfide (VSy@Fe) is synthesized via a one-step in-situ hydrothermal method with 5 at% Fe incorporation. Fe doping reduces the bandgap from 1.85 eV to 1.42 eV, enhances electrical conductivity by ~ 35%, and modifies the layered structure, promoting efficient Mg²⁺ diffusion. VSy@Fe delivers an initial discharge capacity of 210 mAh g⁻¹ at 50 mA g⁻¹, compared to 145 mAh g⁻¹ for pristine VSy, and retains 82% capacity after 100 cycles. Cyclic voltammetry and electrochemical impedance spectroscopy reveal a decrease in charge transfer resistance from 78 Ω (VSy) to 32 Ω (VSy@Fe), confirming improved kinetics. Thermal stability is enhanced, with a 20 °C increase in decomposition temperature. In halogen-free electrolytes, VSy@Fe shows superior initial capacity retention, although prolonged cycling indicates partial ion transport limitations, suggesting further optimization is required. These findings highlight VSy@Fe as a promising cathode material for next-generation Mg-ion batteries with improved performance and stability.