Halogen-Free Ionic Liquid Electrolyte for Green Batteries
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Solution Overview
Problem
Conventional ionic liquids containing halogen atoms, such as fluorine, pose environmental concerns and have inferior heat resistance and viscosity compared to halogen-free alternatives, which lack electrochemical stability and a wide potential window necessary for electrochemical applications.
Innovation Solution
Development of halogen-free ionic liquids composed of a specific cyclic quaternary ammonium cation and a trimethylsilyl alkanesulfonate anion, providing excellent heat resistance and a broad potential window, enhancing their electrochemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogen atoms (such as fluorine) are included in ionic liquids, then electrochemical properties such as ionic conductivity and potential window are improved, but environmental impact worsens
Solution Approach 1:
The invention extracts and removes halogen atoms (particularly fluorine) from the ionic liquid structure by employing halogen-free anions such as trifluoromethanesulfonate, tetrafluoroborate, or hexafluorophosphate anions combined with specific cations, thereby eliminating the harmful environmental factor while attempting to preserve electrochemical performance
Solution Approach 2:
The invention creates composite ionic liquid systems by combining specific cations (such as cyclic ammonium, phosphonium, or sulfonium cations) with halogen-free anions to form new composite materials that achieve both environmental compatibility and satisfactory electrochemical properties
2Object-affected harmful factors
If halogen-free ionic liquids are used, then environmental impact is reduced, but heat resistance and viscosity performance worsen
Solution Approach 1:
The invention changes the structural parameters of halogen-free ionic liquids by selecting specific cation-anion combinations (such as cyclic ammonium cations with trifluoromethanesulfonate anions) and adjusting molecular structure parameters to optimize heat resistance while maintaining halogen-free composition
Solution Approach 2:
The invention develops composite halogen-free ionic liquid systems using specific cation-anion pairs that create synergistic effects, improving thermal stability and heat resistance through the composite structure while maintaining environmental compatibility
3Object-affected harmful factors
If halogen-free ionic liquids are used, then environmental impact is reduced, but potential window and electrochemical stability worsen
Solution Approach 1:
The invention selectively removes halogen atoms from the ionic liquid structure while extracting and incorporating alternative functional groups or molecular structures that can provide similar electrochemical stability without the environmental harm of halogens
Solution Approach 2:
The invention creates composite halogen-free ionic liquids using specific cation-anion combinations where the composite structure provides the necessary electrochemical stability and wide potential window normally associated with halogen-containing ionic liquids
Data Source
Figure 1~2
Figure 3
AI summary
Provided is an ionic liquid comprising a cyclic quaternary ammonium cation indicated by formula (1) and a trimethylsilyl alkanesulfonate anion indicated by formula (2). (In the formula, R1 indicates a C1-3 alkyl group, R2 indicates a methyl group or an ethyl group, n indicates 1 or 2, and m indicates 2 or 3.)