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<p>A composite cathode material (PVP-MnO₂@CC) featuring a three-dimensional porous conductive network structure is constructed by employing a mild hydrothermal method to in-situ grow polyvinylpyrrolidone (PVP)-modified manganese dioxide (MnO₂) nanoparticles on a flexible carbon cloth substrate. The dual-functional PVP modification critically regulates MnO<sub>2</sub> nucleation, promoting the formation of uniformly dispersed nanoparticles, while structural stability is enhanced via surface coordination. Combined with the carbon cloth’s 3D conductive network, this design accelerates electron transfer and optimizes Zn<sup>2+</sup> interfacial kinetics. Electrochemical tests demonstrated that the PVP-MnO₂@CC electrode delivered a highest specific capacity of 327.7 mAh g⁻¹ at 0.2&#xa0;A g<sup>− 1</sup>, while 147.6 mAh g⁻¹ is maintained at 1&#xa0;A g⁻¹. After 200 cycles, 96.2% capacity retention is achieved – significantly higher than that of the unmodified MnO₂@CC electrode (83.8%). Research demonstrates that PVP plays a critical role in refining the material’s nanostructure and suppressing particle agglomeration, thereby synergistically optimizing charge transfer kinetics and ion diffusion efficiency, which ultimately leads to significantly enhanced electrochemical performance and cycling stability. This flexible composite electrode is fabricated via a simple, cost-effective, and binder-free preparation process, providing a scalable cathode strategy for aqueous zinc-ion battery energy storage.</p>

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Loading PVP modified MnO2 nanoparticles as positive electrode material for zinc ion batteries

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Sikai Wang,
  • Youfeng Zhang,
  • Bingzhe Ma,
  • Guang Hu,
  • Fang Li,
  • Yinling Wang,
  • Wenzhu Zhang

摘要

A composite cathode material (PVP-MnO₂@CC) featuring a three-dimensional porous conductive network structure is constructed by employing a mild hydrothermal method to in-situ grow polyvinylpyrrolidone (PVP)-modified manganese dioxide (MnO₂) nanoparticles on a flexible carbon cloth substrate. The dual-functional PVP modification critically regulates MnO2 nucleation, promoting the formation of uniformly dispersed nanoparticles, while structural stability is enhanced via surface coordination. Combined with the carbon cloth’s 3D conductive network, this design accelerates electron transfer and optimizes Zn2+ interfacial kinetics. Electrochemical tests demonstrated that the PVP-MnO₂@CC electrode delivered a highest specific capacity of 327.7 mAh g⁻¹ at 0.2 A g− 1, while 147.6 mAh g⁻¹ is maintained at 1 A g⁻¹. After 200 cycles, 96.2% capacity retention is achieved – significantly higher than that of the unmodified MnO₂@CC electrode (83.8%). Research demonstrates that PVP plays a critical role in refining the material’s nanostructure and suppressing particle agglomeration, thereby synergistically optimizing charge transfer kinetics and ion diffusion efficiency, which ultimately leads to significantly enhanced electrochemical performance and cycling stability. This flexible composite electrode is fabricated via a simple, cost-effective, and binder-free preparation process, providing a scalable cathode strategy for aqueous zinc-ion battery energy storage.