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<p>A facile method to synthesize β-MnO<sub>2</sub> micro-particles under low temperature without templates or catalysts was reported in the study. The products were characterized by power X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrum (FTIR), AC impedance, and cyclic voltammetry measurement (CV). Compared to the commercial Xiangtan electrolytic manganese dioxide (XT-EMD, China), the prepared β-MnO<sub>2</sub> had better crystallinity and nanorod structure, and higher rate performance. The prepared β-MnO<sub>2</sub> and the commercial XT-EMD were used as cathode active materials, respectively, and assembled into CR2032 batteries for discharge performance characterization. The AC impedance analysis of the battery shows that the diffusion coefficient of lithium ions on prepared β-MnO<sub>2</sub> cathode is 29.73% higher than that of XT-EMD cathode. The service life of the prepared β-MnO<sub>2</sub> as cathode was 5.14%, 8.01%, 6.48%, and 11.23% higher than those of the commercial XT-EMD with high-temperature treatment at 15, 8.25, 3, and 1 kΩ constant load discharge, respectively, showing the good rate performance of the prepared β-MnO<sub>2</sub> as cathode active material of Li–MnO<sub>2</sub> battery. At the same time, a small amount of multilayer graphene was doped in cathode, which was benefit for the third-stage discharge performance of the Li–MnO<sub>2</sub> primary battery. And the glass fiber separator was more suitable for the separator of the Li–MnO<sub>2</sub> primary battery and improved the discharge performance of the second stage of discharge.</p>

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The synthesis of β-MnO2 nanorods as cathode and the effect and mechanism of graphene composite on the performance of Li–MnO2 primary battery

  • 期刊论文

  • 发表日期：

    2025年1月10日

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  • Youju Huang,
  • Yichang Xu,
  • Honghai Dai,
  • Libo Huang,
  • Linda Ye,
  • Dong Yang,
  • Zhihao Chen,
  • Zhe Feng

摘要

A facile method to synthesize β-MnO2 micro-particles under low temperature without templates or catalysts was reported in the study. The products were characterized by power X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrum (FTIR), AC impedance, and cyclic voltammetry measurement (CV). Compared to the commercial Xiangtan electrolytic manganese dioxide (XT-EMD, China), the prepared β-MnO2 had better crystallinity and nanorod structure, and higher rate performance. The prepared β-MnO2 and the commercial XT-EMD were used as cathode active materials, respectively, and assembled into CR2032 batteries for discharge performance characterization. The AC impedance analysis of the battery shows that the diffusion coefficient of lithium ions on prepared β-MnO2 cathode is 29.73% higher than that of XT-EMD cathode. The service life of the prepared β-MnO2 as cathode was 5.14%, 8.01%, 6.48%, and 11.23% higher than those of the commercial XT-EMD with high-temperature treatment at 15, 8.25, 3, and 1 kΩ constant load discharge, respectively, showing the good rate performance of the prepared β-MnO2 as cathode active material of Li–MnO2 battery. At the same time, a small amount of multilayer graphene was doped in cathode, which was benefit for the third-stage discharge performance of the Li–MnO2 primary battery. And the glass fiber separator was more suitable for the separator of the Li–MnO2 primary battery and improved the discharge performance of the second stage of discharge.