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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aqueous magnesium-ion batteries (AMIBs) offer a safe and cost-effective energy storage solution.
  • However, sluggish Mg2+ diffusion and structural degradation due to water interactions limit their performance.

Purpose of the Study:

  • To develop a robust electrode material for ultrastable AMIB cycling.
  • To investigate a strain delocalization strategy to enhance electrode structural integrity.

Main Methods:

  • Fabrication of self-ordered Ta-doped MoO3 (MoTaOx) nanotube array electrodes.
  • Analysis of oxygen vacancies and their role in water molecule interaction and Mg2+ diffusion.
  • Evaluation of mechanical strain tolerance and electrochemical cycling performance.

Main Results:

  • MoTaOx electrodes demonstrated facilitated Mg2+ diffusion by accommodating and dissociating water molecules via oxygen vacancies.
  • The material exhibited high shear strain tolerance (~95%) due to strain delocalization.
  • Electrode achieved stable operation over 75,000 cycles with a cumulative capacity of 7.2 kAh g-1.

Conclusions:

  • Strain delocalization via vacancy-pinned, water-regulated magnesiation is a viable strategy for long-lifespan AMIBs.
  • This approach overcomes degradation pathways caused by localized strain from water co-intercalation.
  • The developed MoTaOx electrode significantly advances AMIB performance.