Cyclobutene Electrolyte Composition for Low-Temperature Conductivity
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Solution Overview
Problem
Existing electrolytic solutions for electricity storage elements face challenges in maintaining low resistance and stability across a wide temperature range, particularly at low temperatures, and safety concerns arise from the use of solvents like acetonitrile.
Innovation Solution
The use of a non-aqueous solvent containing 1,3-diethyl-4-methyl-1-cyclobutene or its fluoro-substituted compounds, which have low viscosity and do not generate toxic gases upon combustion, combined with electrolyte salts, to create an electrolytic solution with improved electrical characteristics and reduced resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If propylene carbonate is used as electrolytic solution, then stability is improved, but resistance increases particularly at low temperature
Solution Approach 1:
The patent uses a composite electrolytic solution containing both propylene carbonate (for stability) and acetonitrile (for low-temperature performance). This composite approach combines the advantages of both solvents: propylene carbonate provides operational stability while acetonitrile's low viscosity reduces resistance at low temperatures, resolving the contradiction between stability and low-temperature resistance.
2Object-affected harmful factors
If acetonitrile is used as electrolytic solution, then resistance at low temperature is reduced, but safety deteriorates due to hydrogen cyanide generation
Solution Approach 1:
The patent applies local quality by using acetonitrile in a limited concentration range (5-50 mass%) within the electrolytic solution. This localized use of acetonitrile provides the necessary low-temperature performance while limiting its quantity to prevent excessive hydrogen cyanide generation, thus balancing electrical performance with safety.
3Reliability
If tetraethylammonium tetrafluoroborate is used as electrolyte salt, then stability is improved, but device complexity increases
Solution Approach 1:
The patent optimizes the concentration parameter of tetraethylammonium tetrafluoroborate electrolyte salt within a specific range (0.5-2.0 mol/L). By controlling this parameter, the patent achieves stable electrical characteristics while managing the complexity of the electrolyte composition, as the optimized concentration ensures proper ionic conductivity without requiring overly complex formulation.
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 solution achieves low internal resistance and enhanced conductivity at low temperatures, ensuring stable operation and safety in electricity storage elements.
Implementation Method 1
an electrolyte salt dissolved in the non-aqueous solvent
Implementation Method 2
exhibit an excellent electrical characteristic with low resistance particularly at low temperature
Data Source
AI summary
Electrolytic solution contains non-aqueous solvent and electrolyte salt dissolved in the non-aqueous solvent. The non-aqueous solvent contains a first compound, and the first compound is at least one type selected from a group including 1,3-diethyl-4-methyl-1-cyclobutene and a fluoro-substituted compound of the 1,3-diethyl-4-methyl-1-cyclobutene. An electricity storage element is configured using this electrolytic solution.