Aqueous Zn-ion battery (AZIB) has become an attractive technology because of its unique features of low cost, high safety and the eco-friendliness. MnO₂ is the model cathode material for AZIB since the first report on reversible Zn-MnO₂ battery, but recent studies have unveiled different charge storage mechanisms. Due to revamping of the electrochemistry and redesigning of the electrolyte and interface, there is tremendous performance enhancement in AZIB. This mini Review will first give a brief introduction of ZIB, including fundamentals of materials and components, and the progress in recent years. Then, a general classification of working mechanisms related to MnO₂ in neutral and mildly acidic electrolyte is elaborated. Our focus is put on the recent blossoming Zn-MnO₂ electrolytic mechanism, which has given birth to the Zn-MnO₂ redox flow batteries that are highly promising for large-scale static energy storage.

锌离子水电池（AZIB）凭借其低成本，高安全性和环保特性而成为一项引人注目的技术。自从有关可逆Zn-MnO ₂电池的首次报道以来，MnO ₂是AZIB的模型阴极材料，但是最近的研究揭示了不同的电荷存储机制。由于电化学技术的改进以及电解质和界面的重新设计，AZIB的性能得到了极大的提高。本迷你回顾将首先简要介绍ZIB，包括材料和组件的基础知识以及近年来的进展。然后，对与MnO ₂相关的工作机制进行一般分类在中性和弱酸性电解质中进行了详细说明。我们的重点放在了最近蓬勃发展的Zn-MnO ₂电解机理上，该机理催生了Zn-MnO ₂氧化还原液流电池，对于大规模的静态能量存储，这是非常有前途的。