English

Crystal Structures, Reaction Mechanisms, and Optimization Strategies of MnO₂ Cathode for Aqueous Rechargeable Zinc Batteries

• Xianhong Chen ^1, ,
• Pengchao Ruan ^1, ,
• Xianwen Wu ^3, ,
• Shuquan Liang ^{1, 2,} ,
• Jiang Zhou ^{1, 2, ,}

• 1.

  School of Materials Science & Engineering, Central South University, Changsha 410083, China

• 2.

  Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha 410083, China

• 3.

  College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, Hunan Province, China

Corresponding author: Jiang Zhou, Email: zhou_jiang@csu.edu.cn

• Received Date: 01 November 2021
  Accepted Date: 07 December 2021
  Revised Date: 03 December 2021
  Available Online: 15 November 2022
• Fund Project:

  the Hunan Outstanding Youth Talents 

  the Program of Youth Talent Support for Hunan Province 

  the National Natural Science Foundation of China 

  the National Natural Science Foundation of China 

  the National Natural Science Foundation of China 

  the Innovation-Driven Project of Central South University 

Abstract: Because of the advantages of high safety, environment-friendliness, affordability, and ease of processing, aqueous rechargeable zinc batteries (ARZBs) are promising candidates for next-generation large-scale energy storage systems. In recent years, various cathode materials based on vanadium/manganese/cobalt oxides, Prussian blue analogs, and organic compounds have been reported. Among them, manganese dioxide (MnO₂) is widely used in ARZBs due to their outstanding advantages of low toxicity, eco-friendliness, and high capacity (616 mAh∙g⁻¹ based on two-electron transfer). However, the diversity of the crystal structures of MnO₂ and the unpredictability of the electrochemical reaction make it difficult to investigate the specific internal storage mechanism, which impedes further development of the optimal modification strategies. To date, the main recognized energy storage mechanisms are (de)intercalation and dissolution-deposition mechanisms. In the traditional (de)intercalation mechanism, the predominant issues related to MnO₂ during the cycling process include Mn dissolution, irreversible phase transformation, structural collapse, and sluggish ion diffusion kinetics. On the other hand, the detailed reaction path for the dissolution-deposition mechanism, which was developed in recent years, remains controversial. In addition, the incomplete dissolution-deposition of MnO₂ and the highly acidic environment inevitably leads to corrosion and hydrogen evolution of the zinc anode, as well as low Coulombic efficiency. Accordingly, optimization strategies for different reaction mechanisms have been proposed to make zinc-manganese batteries more competitive. For the (de)intercalation mechanism, modification of composite materials and nanostructure optimization strategies can be adopted to inhibit the dissolution of MnO₂ and increase the number of highly active reaction sites, thus enhancing the electrochemical performance. Moreover, the guest pre-intercalation strategy can help optimize the crystal structure of MnO₂, preventing the collapse of the internal structure during cycling. Besides, defect engineering and element doping strategies focus on regulating the distribution of the electronic structure for affecting the properties of MnO₂, resulting in lowering the energy barrier of zinc insertion. For the dissolution-deposition mechanism, the introduction of a neutral acetate and a halide mediator can effectively facilitate the dissolution-deposition of MnO₂. Meanwhile, metal element catalysis can accelerate the reaction kinetics of the MnO₂ dissolution-deposition, so that high-rate performance can be achieved. Furthermore, the decoupling battery system can separate the cathodic and anodic electrolytes to restrain the hydrogen and oxygen evolution reactions and enhance the potential difference. The flow battery system can effectively eliminate the influence of concentration polarization and stabilize the ion concentration in the electrolytes, thus leading to a large capacity (> 100 mAh). Undoubtedly, MnO₂ as a high-capacity, high-voltage cathode material has broad development prospects for ARZBs. Here, we systematically summarize the crystal structures and reaction mechanisms of MnO₂. We also discuss the optimization strategies toward advanced MnO₂ cathode materials for resolving the highlighted issues in zinc-manganese batteries, which are expected to provide research directions for the design and development of high-performance ARZBs.

Key words:
• Aqueous rechargeable zinc battery
•  /  Manganese dioxide
•  /  Crystal structure
•  /  Reaction mechanism
•  /  Optimization strategy

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