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<p>Using a simple one-pot hydrothermal method, urchin-like, flower-like, thread-like, and bulbous MnO<sub>2</sub> negative electrode materials were synthesized. Physical characterization and electrochemical performance tests revealed that the urchin-like MnO<sub>2</sub> electrode, with its unique structure and larger specific surface area, exhibits superior capacity, stability, and rate performance compared to the other three materials. After 100 cycles at a current density of 0.1 C, the discharge specific capacity of the urchin-like MnO<sub>2</sub> negative electrode material reached 667.8&#xa0;mA&#xa0;h&#xa0;g<sup>−1</sup>, with a specific capacity of 655.4&#xa0;mA&#xa0;h&#xa0;g<sup>−1</sup> and a Coulombic efficiency of 98.14%, all of which were higher than those of the other three samples. The urchin-like MnO<sub>2</sub> morphology is more conducive to addressing the volume strain of MnO<sub>2</sub> negative electrode materials during charge and discharge processes. It fully demonstrates that the MnO<sub>2</sub> in the form of sea urchin-like structure exhibits excellent electrochemical performance.</p> Graphical abstract <p></p>

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Preparation and electrochemical performance research of four different morphologies of MnO2 negative electrode materials

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Wenjuan Zhang,
  • Hanhong Xu,
  • Weizu Du,
  • Kangkang Chang,
  • Panpan Zhang,
  • Xiujuan Chen,
  • Junfeng Ke

摘要

Using a simple one-pot hydrothermal method, urchin-like, flower-like, thread-like, and bulbous MnO2 negative electrode materials were synthesized. Physical characterization and electrochemical performance tests revealed that the urchin-like MnO2 electrode, with its unique structure and larger specific surface area, exhibits superior capacity, stability, and rate performance compared to the other three materials. After 100 cycles at a current density of 0.1 C, the discharge specific capacity of the urchin-like MnO2 negative electrode material reached 667.8 mA h g−1, with a specific capacity of 655.4 mA h g−1 and a Coulombic efficiency of 98.14%, all of which were higher than those of the other three samples. The urchin-like MnO2 morphology is more conducive to addressing the volume strain of MnO2 negative electrode materials during charge and discharge processes. It fully demonstrates that the MnO2 in the form of sea urchin-like structure exhibits excellent electrochemical performance.

Graphical abstract