Rechargeable Zn/MnO₂ battery chemistry in mildly acidic aqueous electrolytes has attracted extensive attention because of its properties as safe, inexpensiveness, and high theoretical specific capacity of cathode/zinc anode. However, the major limitation of MnO₂ cathode is its unclear energy storage mechanism. Herein, the reaction mechanism in ZnSO₄+MnSO₄ electrolyte is investigated by various electrochemical and structural analysis based on two different structure manganese dioxide (α-MnO₂ and δ-MnO₂) and Zn₄SO₄(OH)₆·4H₂O (ZHS) prepared on purpose. We find that the Zn/MnO₂ battery is dominated by the Dissolution-Deposition reaction mechanism, while the classical cations (H⁺, Zn²⁺) Intercalation/De-intercalation mechanism contributes little capacity in energy storage process. The major limitations of reaction kinetics, such as ZHS and active H₂O, are explored in this work. We believe that the systematic research on the Dissolution/Deposition mechanism is useful for researchers to understand the energy storage mechanism of Zn/MnO₂ battery.

中度酸性水性电解质中的可充电Zn / MnO ₂电池化学性质吸引人，因为它具有安全，便宜和正极/锌阳极理论比容量高的特性。然而，MnO ₂阴极的主要局限在于其不清楚的储能机理。这里，在硫酸锌的反应机理₄ +的MnSO ₄电解质是通过基于两个不同的结构的二氧化锰各种电化学和结构分析（α-MnO的研究₂和δ-的MnO ₂）和Zn ₄ SO ₄（OH）₆ ·4H ₂ O（ZHS）是有意准备的。我们发现Zn / MnO₂电池主要由溶解-沉积反应机理控制，而经典的阳离子（H ⁺，Zn ²⁺）嵌入/脱嵌机制在能量存储过程中的容量很小。反应动力学，如ZHS和活性H的主要局限性₂ O，进行了探索了这项工作。我们认为，对溶解/沉积机理的系统研究有助于研究人员了解Zn / MnO ₂电池的储能机理。