Non-aqueous Electrolyte Air Battery Ionic Liquid
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Solution Overview
Problem
Ionic liquids used in air batteries have low migrating ion conductivity due to high viscosity, leading to increased internal resistance and decreased discharge capacity, especially at low temperatures, resulting in poor rate characteristics.
Innovation Solution
A non-aqueous electrolyte air battery utilizing an ionic liquid with bis(fluorosulfonyl)amide as the anion portion, such as N,N,N-trimethyl-N-propylammonium bis(fluorosulfonyl)amide, which increases ion conductivity and solubility of oxygen, reducing viscosity and enhancing discharge capacity and rate characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ionic liquids are used as the solvent of non-aqueous electrolyte in air batteries, then volatility is reduced and electrolyte depletion is prevented, but viscosity increases leading to low migrating ion conductivity
Solution Approach 1:
The patent changes the chemical structure parameters of the ionic liquid by selecting specific anion types (bis(fluorosulfonyl)amide, trifluoromethanesulfonylnonafluorobutanesulfonylamide, bis(pentafluoroethanesulfonyl)amide) to optimize the balance between viscosity and ion conductivity while maintaining low volatility characteristics
Solution Approach 2:
The patent uses composite ionic liquid systems combining specific cations (imidazolium, pyridinium, pyrrolidinium, piperidinium, phosphonium) with specific anions to create electrolyte compositions that achieve both low volatility and high ion conductivity through synergistic effects
2Reliability
If conventional ionic liquids are used in air batteries, then low volatility is achieved, but discharge capacity decreases due to low ion conductivity and high internal resistance
Solution Approach 1:
The patent optimizes electrolyte composition parameters including ionic liquid concentration (0.5-2.0 mol/L), solvent ratios, and temperature conditions to maximize discharge capacity while maintaining the low volatility advantage of ionic liquids
Solution Approach 2:
The patent creates local optimization in the electrolyte system by using specific ionic liquid compositions in different regions or conditions to enhance ion transport efficiency and discharge performance while maintaining overall system stability
3Reliability
If ionic liquids with high viscosity are used, then low volatility is maintained, but rate characteristics deteriorate due to poor ion migration at low temperatures
Solution Approach 1:
The patent changes temperature and composition parameters to optimize rate characteristics, using ionic liquids with specific molecular structures that maintain low viscosity at operating temperatures while preserving low volatility, thereby improving ion migration speed and battery rate performance
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 use of bis(fluorosulfonyl)amide-based ionic liquids in air batteries significantly increases discharge capacity and rate characteristics, providing improved performance even at low temperatures and preventing electrolyte depletion.
Implementation Method 1
a non-aqueous electrolyte which comprises an ionic liquid as a solvent, the ionic liquid comprising bis(fluorosulfonyl)amide as the anion portion
Implementation Method 2
the solubility of oxygen increases in the non-aqueous electrolyte
Data Source
AI summary
An object of the present invention is to provide a non-aqueous electrolyte air battery with large discharge capacity and excellent rate characteristics. Disclosed is a non-aqueous electrolyte air battery including an air cathode, an anode and a non-aqueous electrolyte present between the air cathode and anode, wherein the non-aqueous electrolyte includes an ionic liquid as the solvent, the ionic liquid including bis(fluorosulfonyl)amide as the anion portion.