Issues and Opportunities Facing Aqueous Mn²⁺ /MnO₂ -based Batteries.

Area of Science:

• Electrochemistry
• Materials Science
• Energy Storage

Background:

• Aqueous Mn²⁺/MnO₂ batteries are promising for energy storage due to high working voltage and theoretical capacity (616 mAh g^-1).
• These batteries utilize a two-electron reaction (Mn²⁺/Mn⁴⁺), contributing to their high energy density.

Purpose of the Study:

• To provide a mechanistic understanding of aqueous Mn²⁺/MnO₂ batteries.
• To offer an overview of existing challenges, insufficiencies, and optimization strategies.
• To highlight often-overlooked aspects for future development.

Main Methods:

• Systematic analysis of existing issues and deficiencies in Mn²⁺/MnO₂ battery technology.
• Rational summarization and discussion of optimization strategies with deep insights.
• Proposal of testing methods and performance assessment, including degradation mechanisms.

Main Results:

• Identified and analyzed key challenges hindering the performance of aqueous Mn²⁺/MnO₂ batteries.
• Summarized effective optimization strategies and highlighted novel aspects for improvement.
• Presented proposed testing methods and performance assessment frameworks.

Conclusions:

• A comprehensive understanding of Mn²⁺/MnO₂ battery mechanisms, issues, and optimization is crucial.
• Addressing identified deficiencies and implementing proposed strategies will guide future development.
• This perspective provides essential guidance for advancing aqueous Mn²⁺/MnO₂ battery technology.