Compositional doping and structure insights for high-performance aqueous Zn-ion batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Manganese-based materials are promising cathode candidates for aqueous zinc-ion batteries (AZIBs).
• Stabilizing these materials is crucial for improving battery performance and longevity.
• Manganese oxide (MnO) is a potential cathode material but often suffers from stability issues.

Purpose of the Study:

• To enhance the stability and electrochemical performance of MnO as a cathode material for AZIBs.
• To investigate the effect of Mg²⁺ incorporation on MnO's structure and electrochemical properties.
• To develop a high-performance cathode for aqueous zinc-ion batteries.

Main Methods:

• Synthesis of Mg-doped MnO materials.
• Electrochemical characterization of the Mg-doped MnO as a cathode in AZIBs.
• Cycling stability and rate performance testing.

Main Results:

• Mg²⁺ incorporation effectively stabilizes the MnO structure.
• The Mg-doped MnO exhibits improved reaction kinetics compared to undoped MnO.
• The material demonstrates a reversible capacity of 80.7 mA h g^-1 after 2000 cycles at a high rate of 2 A g^-1.

Conclusions:

• Mg-doped MnO is a stable and high-performance cathode material for AZIBs.
• The incorporation of Mg²⁺ significantly enhances the electrochemical properties of MnO.
• This work presents a viable strategy for developing advanced cathode materials for aqueous energy storage systems.