Efficient Modulation of Electron Pathways by Constructing a MnO_2-@CeO₂ Interface toward Advanced Lithium-Oxygen...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium-oxygen (Li-O₂) batteries face challenges in the formation and decomposition of Li₂O₂.
• Developing active and synergistic cathodes is crucial for improving Li-O₂ battery kinetics.

Purpose of the Study:

• To present a novel strategy for enhancing Li-O₂ battery performance.
• To investigate the synergistic effects of a MnO_2-@CeO₂ heterostructure cathode.

Main Methods:

• Fabrication of a MnO_2-@CeO₂ heterostructure on a porous carbon matrix.
• Electrochemical performance testing of the fabricated cathode in Li-O₂ batteries.
• Theoretical calculations to elucidate reaction mechanisms and interfacial interactions.

Main Results:

• The MnO_2-@CeO₂ cathode exhibited excellent electrochemical performance, including low overpotential, high discharge capacity, and superior cycling stability.
• Theoretical calculations revealed an "electron transfer expressway" via electronic ladders between MnO_2- 3d and CeO₂ 4f orbitals.
• The heterostructure enhanced Li₂O₂ anchoring and facilitated surface-mediated Li₂O₂ formation and decomposition.

Conclusions:

• The MnO_2-@CeO₂ heterostructure cathode offers a promising approach for efficient Li-O₂ batteries.
• Synergistic effects at the heterostructure interface accelerate redox kinetics and reduce overpotential.
• This strategy leads to improved Li₂O₂ handling and enhanced overall battery performance.