Electrolytic Solution Withstand Voltage Conductivity Trade-off
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Solution Overview
Problem
Existing electrolytic capacitor solutions face a trade-off between improved withstand voltage and conductivity, with increased withstand voltage often leading to decreased conductivity.
Innovation Solution
An electrolytic solution for electrolytic capacitors is developed, comprising a polymer with a high content of (meth)acrylic monomers having hydroxy groups, an organic solvent with a hydroxyl group concentration above 10 mmol/g, and an electrolyte, which balances withstand voltage and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyacrylic acid is added to improve withstand voltage, then withstand voltage is improved, but conductivity greatly decreases
Solution Approach 1:
The patent changes the chemical parameters of the electrolytic solution by replacing polyacrylic acid with polyhydroxyalkyl (meth)acrylate, which has different functional groups (hydroxyl instead of carboxyl). This parameter change maintains the polymer's ability to improve withstand voltage while avoiding the harmful effect on conductivity, as the hydroxyl groups provide different electrochemical properties compared to carboxyl groups.
Solution Approach 2:
The patent creates a composite electrolytic solution system combining the polymer (polyhydroxyalkyl (meth)acrylate) with specific organic solvents (ethylene glycol, propylene glycol) and electrolytes. This composite approach allows the polymer to provide withstand voltage improvement while the organic solvent and electrolyte components maintain or enhance conductivity, achieving a synergistic effect that resolves the contradiction.
2Reliability
If polymer additive is used to improve withstand voltage, then withstand voltage increases, but conductivity deteriorates
Solution Approach 1:
The patent modifies the functional parameters of the polymer additive by selecting polyhydroxyalkyl (meth)acrylate with specific hydroxyl group content (60-100 wt%). This parameter specification ensures the polymer provides sufficient withstand voltage improvement while the hydroxyl groups maintain adequate conductivity, unlike carboxyl-containing polymers that severely degrade conductivity.
Solution Approach 2:
The patent applies local quality by specifying that the polymer should have hydroxyl groups rather than carboxyl groups, creating a localized chemical property difference that changes the interaction mechanism with the electrolyte. The hydroxyl groups provide a more favorable local chemical environment that simultaneously supports both withstand voltage and conductivity requirements.
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 both excellent withstand voltage and conductivity, making it suitable for high-drive voltage applications in electrical and electronic products.
Implementation Method 1
an organic solvent (C) having a hydroxyl group concentration of higher than 10 mmol/g
Data Source
AI summary
An electrolytic solution for an electrolytic capacitor contains: an electrolytic solution additive for an electrolytic capacitor (B) containing a polymer (A) that has a (meth)acrylic monomer (a) as an essential component; an organic solvent (C) having a hydroxyl group concentration higher than 10 mmol/g; and an electrolyte (D), the electrolytic solution for an electrolytic capacitor being characterized in that the content of a (meth)acrylic monomer having a hydroxyl group (a1) is 60-100 wt% of the total monomers constituting the polymer (A).