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<p>Electrolytic Zn–MnO<sub>2</sub> batteries are promising candidates for safe and sustainable energy storage owing to their high voltage, environmental benignity, and cost-effectiveness. However, practical applications are hindered by the poor conductivity and the irreversible dissolution of conventional ε-MnO<sub>2</sub> deposits. Herein, we report a scalable semisolid slurry electrode architecture that enables stable MnO<sub>2</sub> deposition/dissolution using a three-dimensional percolating network of carbon nanotubes (CNTs) as both conductive matrix and deposition host. The slurry system promotes the formation of highly conductive γ-MnO<sub>2</sub> owing to enhanced charge transfer kinetics, enabling overall dissolution rather than the localized separation typically seen in traditional electrodes. The Zn–MnO<sub>2</sub> slurry cell exhibits a reversible areal capacity approaching 60&#xa0;mAh cm<sup>−2</sup>. Moreover, the flowable nature of the slurry allows electrochemically inactive MnO<sub>2</sub> formed during dissolution to be reconnected and reactivated by CNTs in the rheological network, ensuring deep utilization and cycling stability. This work establishes a slurry electrode strategy to improve electrolytic MnO<sub>2</sub> reactions and offers a viable pathway toward renewable aqueous batteries for grid-scale applications.</p>

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Unlocking Reversible Mn2+/MnO2 Chemistry in Semisolid Slurry Electrodes for High-Performance Aqueous Zn–Mn Batteries

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月12日

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  • Zefang Yang,
  • Qi Zhang,
  • Chao Hu,
  • Yougen Tang,
  • Jinchi Li,
  • Qi Wang,
  • Wanhai Zhou,
  • Dongliang Chao,
  • Haiyan Wang

摘要

Electrolytic Zn–MnO2 batteries are promising candidates for safe and sustainable energy storage owing to their high voltage, environmental benignity, and cost-effectiveness. However, practical applications are hindered by the poor conductivity and the irreversible dissolution of conventional ε-MnO2 deposits. Herein, we report a scalable semisolid slurry electrode architecture that enables stable MnO2 deposition/dissolution using a three-dimensional percolating network of carbon nanotubes (CNTs) as both conductive matrix and deposition host. The slurry system promotes the formation of highly conductive γ-MnO2 owing to enhanced charge transfer kinetics, enabling overall dissolution rather than the localized separation typically seen in traditional electrodes. The Zn–MnO2 slurry cell exhibits a reversible areal capacity approaching 60 mAh cm−2. Moreover, the flowable nature of the slurry allows electrochemically inactive MnO2 formed during dissolution to be reconnected and reactivated by CNTs in the rheological network, ensuring deep utilization and cycling stability. This work establishes a slurry electrode strategy to improve electrolytic MnO2 reactions and offers a viable pathway toward renewable aqueous batteries for grid-scale applications.