Ether-Containing Solvent for Fluoride Ion Battery Stability
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Solution Overview
Problem
Fluoride ion batteries face challenges due to the low stability of fluoride ions, which react excessively with other materials before interacting with active materials, leading to insufficient reaction with the active material.
Innovation Solution
An electrolytic solution for fluoride ion batteries is developed, utilizing an ether-containing solvent with a cation structure where an ether group binds to a central element like N or P, suppressing the reaction between fluoride ions and the solvent, thereby enhancing the stability and activity of fluoride ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solvents are used in fluoride ion batteries, then the electrolytic solution can dissolve fluoride salts, but fluoride ions react excessively with the solvent leading to low stability and insufficient reaction with active materials
Solution Approach 1:
The patent changes the chemical parameters of the solvent by introducing ether groups at specific positions in the cation structure. This structural modification alters the solvent's chemical properties to reduce its reactivity with fluoride ions while maintaining its ability to dissolve fluoride salts, thereby stabilizing fluoride ions without sacrificing solubility.
Solution Approach 2:
The patent employs composite solvent molecules containing both ionic liquid components (for high solubility and electrochemical stability) and ether groups (for reduced reactivity with fluoride ions). This composite structure combines the advantages of different material components to achieve both stable fluoride ion dissolution and suppressed unwanted reactions.
2Reliability
If fluoride ions are made more stable, then they can react better with active materials, but their reactivity with other materials must be reduced
Solution Approach 1:
The patent applies local quality modification by placing ether groups at specific local positions (alpha and/or beta positions) within the cation structure. This localized structural change affects only the local chemical environment around fluoride ions, stabilizing them where needed while preserving their reactivity with active materials through careful positioning that doesn't overly hinder approach to active material surfaces.
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
This solution improves the fluoridation activity of active materials, stabilizes the fluoride ions, and results in a high-capacity fluoride ion battery with improved coulombic efficiency and reduced reaction resistance.
Implementation Method 1
a solvent for dissolving the fluoride salt, in which the solvent is an ether-containing material having a cation and an anion
Implementation Method 2
an electrolyte layer that is formed between the positive electrode active material layer and the negative electrode active material layer. The electrolyte layer includes the above-described electrolytic solution for a fluoride ion battery
Data Source
AI summary
An electrolytic solution for a fluoride ion battery includes: a fluoride salt; and a solvent for dissolving the fluoride salt, in which the solvent is an ether-containing material having a cation and an anion, and in the cation, an ether group represented by —CH2—O—R (where R represents an alkyl group or a fluoroalkyl group) binds to a cation central element which is N or P.