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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

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

Shiyu Ma¹, Youcai Lu¹, Xiaodan Zhu¹

¹Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China.

ACS Applied Materials & Interfaces

|May 9, 2022

Summary

Developing a novel MnO_2-@CeO₂ heterostructure cathode significantly enhances lithium-oxygen battery performance. This synergistic cathode facilitates efficient lithium peroxide formation and decomposition, boosting battery capacity and stability.

Keywords:

Li−O2 batteries MnO2−x@CeO2 heterostructure density functional theory electronic ladders performance

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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.