Electrolyte Solution Impurity Control for High Voltage Capacitors
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Solution Overview
Problem
Conventional electrolyte solutions for electrochemical devices, such as electrical double layer capacitors, face challenges in maintaining high voltage resistance and capacity retention due to impurities like potassium ions, moisture, tertiary amines, heterocyclic compounds, and ammonia, which increase resistance and reduce capacity under continuous high voltage applications.
Innovation Solution
An electrolyte solution with a nitrile compound and a quaternary ammonium salt, specifically formulated to have potassium ion content less than 10 ppm, moisture content of 20 ppm or less, tertiary amine content of 30 ppm or less, and heterocyclic compound and ammonia content of 20 ppm or less, along with the addition of sulfolane and fluorine-containing ethers, to suppress resistance increase and enhance capacity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used, then the electrochemical device can operate, but the resistance increases and capacity decreases under continuous high voltage applications
Solution Approach 1:
The patent applies the extraction principle by systematically removing harmful impurities (potassium ions, moisture, tertiary amines, heterocyclic compounds, and ammonia) from the electrolyte solution through purification processes. This extraction of harmful substances directly addresses the technical contradiction by eliminating the root cause of resistance increase while maintaining the electrochemical device's operational capability
Solution Approach 2:
The patent applies parameter changes by establishing specific quantitative thresholds for impurity concentrations (potassium ions <10 ppm, moisture <20 ppm, tertiary amines <30 ppm, heterocyclic compounds <30 ppm, ammonia <20 ppm). By controlling these parameters within defined ranges, the electrolyte solution maintains low resistance and high capacity retention under high voltage conditions
2Reliability
If impurity content is reduced to maintain high voltage resistance, then the electrolyte solution requires more stringent purification, but the manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by implementing purification steps before the electrolyte solution is assembled into the electrochemical device. By pre-purifying the electrolyte solution to meet specific impurity thresholds, the manufacturing process ensures high voltage resistance is achieved without requiring complex in-situ purification systems within the device itself
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 effectively maintains low resistance and high capacity retention even under high voltage conditions, improving the durability and performance of electrochemical devices like electrical double layer capacitors.
Implementation Method 1
An electrolyte solution with a nitrile compound and a quaternary ammonium salt
Data Source
AI summary
The present invention aims to provide an electrolyte solution that is less likely to lead to an increase in resistance and realizes high capacity retention factor even after continuous application of a high voltage, and to provide an electrochemical device. The present invention provides an electrolyte solution including: a nitrile compound; and a quaternary ammonium salt, the electrolyte solution having a potassium ion content of less than 10 ppm, a moisture content of 20 ppm or less, a tertiary amine content of 30 ppm or less, a heterocyclic compound content of 30 ppm or less, and an ammonia content of 20 ppm or less.