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This study introduces an aluminum-based high-entropy alloy (Al-HEA) for sustainable batteries. The Al-HEA enables efficient aluminum-ion transport and stabilizes the interface, overcoming limitations of traditional aluminum-metal batteries.

Keywords:
aluminum‐metal batteriesaqueous batterieshigh entropy alloysoxidation resistance

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium (Li)-ion batteries are widely used but face sustainability challenges due to Li scarcity.
  • Aluminum (Al) is earth-abundant and offers high theoretical capacity, but traditional Al-metal batteries are hindered by a passivating Al₂O₃ layer.
  • Efficient Al³⁺ transport and stable interfaces are crucial for developing advanced Al-based batteries.

Purpose of the Study:

  • To develop a novel Al-based material that overcomes the limitations of traditional Al-metal batteries.
  • To enable efficient Al³⁺ transport and stabilize the Al-metal/aqueous-electrolyte interface.
  • To demonstrate a high-performing aqueous Al-Selenium (Al-Se) battery utilizing the new material.

Main Methods:

  • Development and characterization of an Al-based high-entropy alloy (Al-HEA).
  • First-principles calculations to investigate the electronic structure and oxidation behavior of the Al-HEA.
  • Electrochemical testing of an aqueous Al-Se battery system employing the Al-HEA.

Main Results:

  • The Al-HEA exhibits a solid-solution structure that thermodynamically suppresses oxidation by facilitating electron transfer.
  • The Al-HEA demonstrates kinetically sluggish oxidation compared to pure Al, maintaining an open interface for Al³⁺ transport with low overpotential.
  • A high-performing aqueous Al-Se battery was successfully demonstrated, leveraging the unique properties of the Al-HEA.

Conclusions:

  • The developed Al-HEA effectively enables efficient Al³⁺ transport and stabilizes the battery interface.
  • This Al-HEA represents a promising alternative for sustainable and high-performance aluminum-based battery technologies.
  • The findings pave the way for next-generation energy storage solutions beyond Li-ion.