Fluorinated Ionic Liquid Electrolyte for Metal-Air Battery Oxygen Solubility
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Solution Overview
Problem
Current metal-air batteries face challenges in achieving high performance due to the limitations of existing electrolytes, particularly in terms of oxygen solubility and diffusivity, which hinder the efficient transport of reactants and affect energy density.
Innovation Solution
Development of an ionic liquid with a cationic chemical species containing a nitrogen moiety and a partially fluorinated alkyl chain moiety, which can be synthesized through a process involving a partially fluorinated alkyl halide, a secondary or tertiary amine, and an organic solvent, to enhance solubility, diffusivity, and thermal stability, thereby optimizing the electrolyte's properties for metal-air batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional electrolytes are used in metal-air batteries, then the battery structure is simple and easy to manufacture, but the oxygen solubility and diffusivity are insufficient, limiting energy density
Solution Approach 1:
The patent employs composite ionic liquid electrolytes combining multiple ionic liquid components with different functional properties. The cationic species includes a nitrogen-containing moiety and a partially fluorinated alkyl chain, while the anionic species comprises fluorinated groups. This composite structure achieves enhanced oxygen solubility and diffusivity through the synergistic effects of different molecular components, resolving the contradiction between performance improvement and composition complexity.
Solution Approach 2:
The patent systematically varies key parameters of the ionic liquid structure, including the length of the fluorinated alkyl chain, the type of nitrogen-containing moiety, and the fluorination degree of the anionic species. By optimizing these parameters, the electrolyte achieves maximum oxygen solubility and diffusivity while maintaining manageable complexity for practical application.
2Reliability
If electrolytes with high ionic conductivity are used, then the battery performance improves, but the thermal stability may be compromised
Solution Approach 1:
The ionic liquid structure is designed with distinct functional regions: the nitrogen-containing cationic moiety provides high ionic conductivity through efficient ion transport, while the fluorinated alkyl chain and fluorinated anionic groups contribute to thermal stability through strong bond energies and low reactivity. This spatial separation of functional qualities within the molecular structure allows simultaneous achievement of high ionic conductivity and thermal stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The ionic liquid improves the solubility and diffusivity of reactants like oxygen, enhances thermal stability, and promotes high ionic conductivity, leading to improved performance and energy density in metal-air batteries.
Implementation Method 1
The length of the partially fluorinated alkyl chain moiety may be selectively varied in order to modify the solubility and/or diffusivity of reactants such as ions or oxygen
Implementation Method 2
fast transport of the reactant, oxygen, through the electrolyte is a primary obstacle to achieving high performance in metal-air batteries
Implementation Method 3
Ionic liquids are useful as an electrolyte component in lithium, sodium, magnesium, and zinc batteries as they are non-volatile, non-flammable, have a low melting point, and have high ionic conductivity
Data Source
AI summary
An ionic liquid comprising a cationic chemical species and an anionic chemical species. The cationic chemical species comprising a nitrogen containing moiety and a partially fluorinated alkyl chain moiety, wherein the partially fluorinated alkyl chain moiety is bonded to a nitrogen atom of the nitrogen containing moiety. The ionic liquid can be used as an electrolyte, as an additive to an organic solvent, as a lubricant, as a hydrophobic coating, as a treatment for fluorinated pollutants, as an electrolyte for sensor applications, as a stabilizing additive for existing battery electrolytes, and as an emulsifier.