Halogen-Free Electrolyte Salt for Wide Potential Window
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Solution Overview
Problem
Conventional electrolyte salts for nonaqueous electrolyte-type electrical double-layer capacitors contain halogen atoms, posing environmental concerns and lacking a wide potential window for electrochemical stability.
Innovation Solution
A quaternary ammonium cation combined with a trimethylsilyl alkanesulfonate anion is used to create a halogen-free electrolyte salt with a wide potential window, enhancing electrochemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional electrolyte salts containing halogen atoms are used, then good solubility and degree of dissociation are achieved, but environmental impact is negative
Solution Approach 1:
The invention changes the chemical composition parameters of the electrolyte salt by replacing halogen-containing anions with fluorinated sulfonate anions that have different molecular structure and chemical properties, achieving both environmental compatibility and required electrochemical performance
Solution Approach 2:
The invention uses composite molecular structure combining quaternary ammonium cations with fluorinated sulfonate anions to create a new class of electrolyte salts that integrate the advantages of both components: the electrochemical stability of quaternary ammonium salts and the environmental benefits of fluorinated sulfonates
2Object-affected harmful factors
If halogen-free electrolyte salts are used, then environmental impact is reduced, but potential window is narrow
Solution Approach 1:
The invention optimizes the molecular structure parameters of the anion by introducing specific fluorinated sulfonate groups and adjusting alkyl chain lengths, which enhances the electrochemical stability and widens the potential window while maintaining halogen-free composition
Solution Approach 2:
The invention copies the successful electrochemical properties of halogen-containing electrolyte salts by designing fluorinated sulfonate anions with similar charge distribution and solvation characteristics, achieving comparable potential windows without halogen atoms
3Reliability
If quaternary ammonium salts with wide potential window are developed, then electrochemical stability is improved, but environmental friendliness must be maintained
Solution Approach 1:
The invention creates a composite electrolyte salt structure combining quaternary ammonium cations with fluorinated sulfonate anions, integrating the electrochemical stability of quaternary ammonium salts with the environmental benefits of fluorinated sulfonates to achieve both wide potential window and environmental friendliness simultaneously
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Provided is an electrolyte salt comprising a quaternary ammonium cation indicated by formula (1) and a trimethylsilyl alkanesulfonate anion indicated by formula (2). (In the formula, R1-R4 each independently indicate a C1-4 alkyl group or an alkoxyalkyl group indicated by -(CH2)n-OR. Any two among R1-R4 can mutually bond and form a ring together with a nitrogen atom to which same have bonded. The remaining two can mutually bond and form a spiro ring having a nitrogen atom as the spiro atom therefor. R indicates a methyl group or an ethyl group. n indicates 1 or 2 and m indicates 2 or 3.)