Breakthrough in Metal-Air Batteries: Rechargeable Neutral Hybrid Zn-air/MnO2 Battery with High Energy Efficiency

Strategic Insights -

Researchers at the University of Electronic Science and Technology of China have made a significant breakthrough in metal-air batteries, introducing a high-efficiency neutral hybrid Zn-air/MnO2 battery (ZAMB) that achieves an energy efficiency of 68%, a significant increase from 38% in conventional Zn-air batteries. This innovative design integrates multiple electrochemical reactions in a single hybrid battery, improving energy efficiency, longevity, and the performance of metal-air batteries with low-conductivity discharge products.

Key Takeaways:

  • The researchers developed a high-efficiency neutral hybrid Zn-air/MnO2 battery (ZAMB) that achieves an energy efficiency of 68%, a significant increase from 38% in conventional Zn-air batteries.
  • The hybrid ZAMB exhibits better cycling stability, operating reliably over 100 h at a current density of 1 mA cm(-2) and up to 300 h at 0.1 mA cm(-2).
  • The electrodeposited MnO2 acts as the active material for the Zn-MnO2 battery and as a dynamically formed catalyst for the ORR/OER processes.
  • In situ pH and X-ray diffraction (XRD) analyses verify the effect of MnO2 in promoting the reversible formation and decomposition of low-conductivity discharge products.
  • The hybrid ZAMB has the potential to improve energy efficiency, longevity, and the performance of metal-air batteries with low-conductivity discharge products.
  • The researchers used a ZnSO4-MnSO4 electrolyte and in situ electrodeposited MnO2 on the air cathode.
  • The study was funded by the National Natural Science Foundation of China (NSFC), Analysis and Testing Center, University of Electronic Science and Technology of China, Sichuan Science and Technology Program, Fundamental Research Funds for the Central Universities, and Center for HPC, University of Electronic Science and Technology of China.

Statistics:

  • Energy efficiency: 68% in hybrid ZAMB vs. 38% in conventional Zn-air batteries
  • Cycling stability: 100 h at 1 mA cm(-2) and up to 300 h at 0.1 mA cm(-2)
  • Capacity: 1 Ah in rechargeable pouch-type ZAMB

Sources:

  • Advanced Energy Materials, 2025
  • Wei Sun, University of Electronic Science and Technology of China, School of Materials and Energy
  • Yu Feng, Sha Luo, An Duan, Ming Li, and Bao Zhang, University of Electronic Science and Technology of China
  • National Natural Science Foundation of China (NSFC)
  • Analysis and Testing Center, University of Electronic Science and Technology of China
  • Sichuan Science and Technology Program
  • Fundamental Research Funds for the Central Universities
  • Center for HPC, University of Electronic Science and Technology of China
  • Wiley-Blackwell (www.wiley.com/)
  • Advanced Energy Materials (onlinelibrary.wiley.com/journal/10.1002/(ISSN)1614-6840)