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A Low-Volatile and Durable Deep Eutectic Electrolyte for High-Performance Lithium-Oxygen Battery.

Chao-Le Li1,2, Gang Huang2, Yue Yu2

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Researchers developed a novel deep eutectic electrolyte (DEE) for lithium-oxygen batteries (LOBs). This stable electrolyte enables long-term LOB operation, enhancing energy storage potential.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Lithium-oxygen batteries (LOBs) offer high theoretical energy density but suffer from unstable electrolytes.
  • Current electrolytes struggle with the oxidative environment, lithium metal anode reactivity, and solvent evaporation.

Purpose of the Study:

  • To develop a stable and effective electrolyte for long-term lithium-oxygen battery operation.
  • To address the limitations of conventional electrolytes in LOBs.

Main Methods:

  • A deep eutectic electrolyte (DEE) was synthesized by mixing N-methylacetamide (NMA) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI).
  • The NMA-based DEE's properties (ionic conductivity, stability, compatibility) were evaluated.
  • LOBs utilizing the NMA-based DEE were assembled and tested for performance.

Main Results:

  • The NMA-based DEE demonstrated high ionic conductivity, excellent thermal, chemical, and electrochemical stability.
  • The DEE showed good compatibility with the lithium metal anode.
  • LOBs with the NMA-based DEE achieved a high discharge capacity (8647 mAh g⁻¹), excellent rate performance, and a cycling lifetime of 280 cycles.

Conclusions:

  • The developed NMA-based DEE is a promising electrolyte for enabling stable and high-performance lithium-oxygen batteries.
  • This advancement offers new possibilities for designing electrolytes and advancing LOB technology.