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<p>Rechargeable magnesium batteries (RMBs) have become a research hotspot due to their high energy density, low cost, and safety. However, due to the high polarization and slow diffusion kinetics of Mg<sup>2+</sup> in the cathode material, the development of a suitable cathode material is critical. NiS<sub>2</sub> is regarded as a promising cathode material for RMBs owing to its high theoretical specific capacity and weaker Ni–S bond. Nevertheless, the low conductivity of the discharge product and large volume change during cycling limits the application potential of the NiS<sub>2</sub> cathode. Hence, this work explored a metal–organic framework (MOF) derivative strategy to prepare a NiS<sub>2</sub>/C nanocomposite via simultaneous carbonization and sulfurization. When employed as cathode material for RMBs, the as-prepared NiS<sub>2</sub>/C nanocomposite with high NiS<sub>2</sub> content exhibited maximum discharge capacity of 379&#xa0;mAh&#xa0;g<sup>−1</sup> at a current density of 200&#xa0;mA&#xa0;g<sup>−1</sup>, with specific capacity maintained at 213 mAh&#xa0;g<sup>−1</sup> after 100 cycles. The superior electrochemical performance benefits from both the nanosized NiS<sub>2</sub> and porous carbon skeleton, which may accelerate the electrochemical reaction kinetics and provide a buffer space for volume change during repeated charge and discharge.</p>

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Metal–Organic Framework-Derived NiS2/C Nanocomposite for High-Performance Rechargeable Magnesium Batteries

  • 期刊论文

  • 发表日期：

    2025年5月23日

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  • Lili Pei,
  • Shijiao Sun,
  • Xiangyu Zhao

摘要

Rechargeable magnesium batteries (RMBs) have become a research hotspot due to their high energy density, low cost, and safety. However, due to the high polarization and slow diffusion kinetics of Mg2+ in the cathode material, the development of a suitable cathode material is critical. NiS2 is regarded as a promising cathode material for RMBs owing to its high theoretical specific capacity and weaker Ni–S bond. Nevertheless, the low conductivity of the discharge product and large volume change during cycling limits the application potential of the NiS2 cathode. Hence, this work explored a metal–organic framework (MOF) derivative strategy to prepare a NiS2/C nanocomposite via simultaneous carbonization and sulfurization. When employed as cathode material for RMBs, the as-prepared NiS2/C nanocomposite with high NiS2 content exhibited maximum discharge capacity of 379 mAh g−1 at a current density of 200 mA g−1, with specific capacity maintained at 213 mAh g−1 after 100 cycles. The superior electrochemical performance benefits from both the nanosized NiS2 and porous carbon skeleton, which may accelerate the electrochemical reaction kinetics and provide a buffer space for volume change during repeated charge and discharge.