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Edge-Dislocated WO3 Photocathode Toward Efficient Photo-Assisted Li-O2 Batteries.

Meng Wang1, Zhangliu Tian1,2, Guanxing Li3

  • 1Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.

Advanced Materials (Deerfield Beach, Fla.)
|July 21, 2025
PubMed
Summary

Photoexcitation improves lithium-oxygen (Li-O2) battery performance by enhancing the conductivity of insulating lithium peroxide (Li2O2). This breakthrough enables photo-assisted Li-O2 batteries with significantly higher capacities and stability.

Keywords:
Li2O2 photoexcitationZ‐type heterojunctiondefect engineeringphoto‐assisted Li‐O2 battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Rechargeable lithium-oxygen (Li-O2) batteries are promising energy storage devices.
  • The insulating nature of lithium peroxide (Li2O2) hinders reaction kinetics, limiting battery performance.
  • Developing strategies to overcome Li2O2 insulation is crucial for practical applications.

Purpose of the Study:

  • To investigate the effect of photoexcitation on the insulating properties of Li2O2.
  • To develop novel photo-assisted Li-O2 batteries utilizing photocathode@Li2O2 heterojunctions.
  • To enhance the charge carrier dynamics and electrochemical performance of Li-O2 batteries.

Main Methods:

  • Fabrication of Z-type photocathode@Li2O2 heterojunctions using edge-dislocated WO3 as the photocathode.
  • Photoexcitation of Li2O2 to generate charge carriers and improve conductivity.
  • Electrochemical characterization of the photo-assisted Li-O2 battery performance, including discharge capacity, current density, and cycling stability.

Main Results:

  • Photoexcitation effectively reduces the insulating properties of Li2O2.
  • Sustained growth of thick Li2O2 films (>18 µm) was achieved.
  • The photo-assisted battery delivered an ultra-high discharge capacity of 31,800 mAh g-1 at 100 mA g-1.
  • Achieved low polarization overpotential (0.04 V) and high reversibility over 1000 hours.

Conclusions:

  • Photoexcitation is a viable strategy to enhance Li2O2 conductivity in Li-O2 batteries.
  • The developed photo-assisted Li-O2 battery demonstrates significantly improved performance compared to conventional systems.
  • This work offers a new pathway for advancing high-performance metal-air batteries.