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Bubble-Sheet-Like Interface Design with an Ultrastable Solid Electrolyte Layer for High-Performance Dual-Ion

Panpan Qin1,2, Meng Wang1, Na Li1

  • 1Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China.

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Researchers developed a novel hollow aluminum anode for dual-ion batteries, enhancing cycling stability and performance. This design significantly improves energy density and longevity for advanced battery applications.

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aluminum anodesdual-ion batterieshollow nanostructuressolid electrolyte interfaces

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aluminum anode-based dual-ion batteries offer potential for high energy density.
  • Improving cycling stability and rate performance of aluminum anodes remains a challenge.
  • Volumetric expansion and solid electrolyte interface (SEI) instability hinder aluminum anode performance.

Purpose of the Study:

  • To design a bubble-sheet-like hollow interface on an aluminum foil anode.
  • To enhance the cycling stability and rate performance of aluminum anode-based dual-ion batteries.
  • To investigate the effect of controlled alloying and SEI stabilization on battery performance.

Main Methods:

  • Fabrication of a carbon-coated hollow aluminum anode.
  • Utilizing the hollow aluminum anode as both the active material and current collector.
  • Characterization of the anode structure, SEI layer, and electrochemical performance.

Main Results:

  • The hollow anode structure effectively confined alloy formation and size, restricting volumetric expansion.
  • An ultrastable solid electrolyte interface (SEI) was achieved.
  • The dual-ion battery demonstrated excellent long-term cycling stability (≈99% capacity retention over 1500 cycles at 2 C).
  • High energy density (169 Wh kg⁻¹) was maintained even at a high power density (2113 W kg⁻¹).

Conclusions:

  • The bubble-sheet-like hollow interface design significantly improves the stability and rate capability of aluminum anodes in dual-ion batteries.
  • This interfacial engineering strategy offers a promising approach for developing advanced metal anode-based battery systems.
  • The developed battery system exhibits superior performance compared to many conventional lithium-ion batteries.