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<p>Manganese dioxide (MnO<sub>2</sub>) is a promising cathode material for aqueous zinc-ion batteries (AZIBs) due to its high operating voltage, rich resources and environmental friendliness. However, its slow electrochemical kinetics and poor cycling stability constrain its practical application. In the study, Sn-BiOCl prepared by hydrothermal method was used as a bimetallic cation dopant to investigate the effect of tin and bismuth on the structure and properties of K<sup>+</sup> pre-intercalated δ-MnO<sub>2</sub> (K<sub>0.27</sub>MnO<sub>2</sub>·0.54H<sub>2</sub>O). The electrode shows a discharge specific capacity of up to 464 mAh&#xa0;g<sup>−1</sup> at a current density of 0.1&#xa0;A&#xa0;g<sup>−1</sup>, and the capacity retention rate was 110% after 200 cycles. The long-cycle life and excellent capacity retention rate have been induced due to the doping of Sn<sup>2+</sup> improving the electrical conductivity and the doping of Bi<sup>3+</sup> effectively maintaining the laminar structure of the cathode. Bimetallic cation doping resulted in larger nanoflower size of the material and increased specific surface area of manganese dioxide, which improved the ion diffusion rate. The work provides a rational way to design high-performance Mn-based AZIBs cathode materials.</p>

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Sn and Bi dual-doping K+ pre-intercalated δ-MnO2 as cathode material for aqueous zinc-ion batteries

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Ting Yin,
  • Changxin Han,
  • Yuxuan Xiao,
  • Juan Chou,
  • Yuhong Zheng,
  • Juanjuan Cheng,
  • Yun Ou,
  • Li Yang,
  • Cuiying Dai,
  • Longfei Liu

摘要

Manganese dioxide (MnO2) is a promising cathode material for aqueous zinc-ion batteries (AZIBs) due to its high operating voltage, rich resources and environmental friendliness. However, its slow electrochemical kinetics and poor cycling stability constrain its practical application. In the study, Sn-BiOCl prepared by hydrothermal method was used as a bimetallic cation dopant to investigate the effect of tin and bismuth on the structure and properties of K+ pre-intercalated δ-MnO2 (K0.27MnO2·0.54H2O). The electrode shows a discharge specific capacity of up to 464 mAh g−1 at a current density of 0.1 A g−1, and the capacity retention rate was 110% after 200 cycles. The long-cycle life and excellent capacity retention rate have been induced due to the doping of Sn2+ improving the electrical conductivity and the doping of Bi3+ effectively maintaining the laminar structure of the cathode. Bimetallic cation doping resulted in larger nanoflower size of the material and increased specific surface area of manganese dioxide, which improved the ion diffusion rate. The work provides a rational way to design high-performance Mn-based AZIBs cathode materials.