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Superoxide stability for reversible Na-O2 electrochemistry.

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Stabilizing superoxide is key for reversible sodium-oxygen batteries. High donor number electrolytes enhance superoxide stability, improving battery performance and guiding salt/solvent selection.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Superoxide stabilization is crucial for reversible sodium-oxygen batteries.
  • The discharge product, sodium superoxide (NaO2), offers better reversibility than peroxide or oxide.
  • Existing sodium-oxygen batteries face challenges in achieving stable superoxide discharge products.

Purpose of the Study:

  • To investigate the role of Lewis basicity, quantified by donor numbers (DNs), in stabilizing superoxide.
  • To establish a DN map for guiding the selection of salt/solvent pairs for sodium-oxygen batteries.
  • To demonstrate improved reversibility in sodium-oxygen batteries using a high-DN electrolyte.

Main Methods:

  • Quantitative representation of Lewis basicity using donor numbers (DNs) for anions and solvents.
  • Development of a DN map to predict superoxide stability.
  • Construction of sodium-oxygen batteries utilizing a high-DN electrolyte system (sodium triflate/dimethyl sulfoxide).
  • Utilizing pre-sodiated antimony as an anode to circumvent solvent-metal reactions.

Main Results:

  • Lewis basicity of anions and solvents directly influences superoxide stability and sodium-oxygen battery reversibility.
  • A DN map was successfully created, serving as a guide for electrolyte selection.
  • Sodium-oxygen batteries with a high-DN pair (triflate/DMSO) exhibited enhanced reversible operation.
  • The use of pre-sodiated antimony as an anode proved effective with the DMSO-based electrolyte.

Conclusions:

  • Electrolyte design based on donor numbers is a viable strategy for enhancing sodium-oxygen battery performance.
  • High-DN salt/solvent combinations significantly improve superoxide stability and cycling reversibility.
  • The findings provide a roadmap for developing more efficient and stable sodium-oxygen battery systems.