Acrylic Polymer Electrolyte for Higher-Voltage Electrolytic Capacitors
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Solution Overview
Problem
Existing methods for improving the withstand voltage of electrolytic capacitors are insufficient, limiting their performance in high-drive voltage applications.
Innovation Solution
An electrolyte solution for electrolytic capacitors comprising an organic solvent, an acrylic polymer with hydroxy and/or carboxy groups, and a specific concentration of hydroxy groups, along with a glass transition temperature range, is developed to enhance the capacitor's withstand voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyhydric alcohol is added to electrolyte solution to improve withstand voltage, then withstand voltage is improved, but the effect is insufficient and cannot achieve high-drive voltage operation
Solution Approach 1:
The invention changes the chemical composition parameters of the electrolyte solution by introducing specific acrylic polymers with controlled glass transition temperatures and functional groups (hydroxy and/or carboxy groups). This chemical parameter change enables significant improvement in withstand voltage, achieving high-drive voltage operation that previous methods could not accomplish.
Solution Approach 2:
The invention uses composite materials by combining acrylic polymers with specific properties (glass transition temperature of -50°C to 56°C, containing hydroxy and/or carboxy groups) with the electrolyte solution. This composite approach creates a new electrolyte system that achieves superior withstand voltage performance compared to simple polyhydric alcohol addition.
2Reliability
If conventional electrolyte solutions are used, then basic capacitor function is maintained, but conductivity is insufficient for high-performance applications
Solution Approach 1:
The invention optimizes the electrolyte composition by controlling the glass transition temperature of the acrylic polymer within a specific range (-50°C to 56°C) and adjusting the concentration of hydroxy groups (10 mmol/g or less). These parameter optimizations simultaneously improve both the stability of basic capacitor function and the conductivity, enabling high-performance operation.
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 significantly improves the capacitor's withstand voltage and conductivity, providing better performance in high-drive voltage environments.
Implementation Method 1
an electrolyte solution for an electrolytic capacitor including a solvent containing an organic solvent, an acrylic polymer having hydroxy group and/or carboxy group, and an electrolyte
Data Source
AI summary
The purpose of the present invention is to provide an electrolyte solution for an electrolytic capacitor which has high withstand voltage. The electrolyte solution for an electrolytic capacitor that is used contains: a solvent which contains γ-butyrolactone; an acrylic polymer which has a hydroxy group and/or a carboxy group; and an electrolyte. The acrylic polymer which has a hydroxy group and/or a carboxy group is preferably a polymer which has, as essential constituent monomers, a monomer having (meth)acryloyl group and hydroxy group, and/or a monomer having (meth)acryloyl group and carboxy group.