Electrolytic Solution Copolymer for High Voltage Capacitors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrolytic capacitors face challenges in achieving high voltage resistance, high initial conductivity, and excellent heat resistance, with existing solutions providing insufficient improvements in electrical conductivity and voltage resistance.
Innovation Solution
An electrolytic solution for electrolytic capacitors is developed, comprising an electrolyte with an anion obtained by removing hydrogen ions from a carboxy group of a copolymer with specific substituents and a solvent containing ethylene glycol, ensuring the copolymer meets certain conductivity and molecular weight conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a salt of 1,6-decanedicarboxylic acid is used as an electrolyte, then high temperature stability is improved, but the electrical conductivity is insufficient and voltage resistance is not high
Solution Approach 1:
The patent uses a copolymer electrolyte comprising multiple monomer units (acrylic acid, methacrylic acid, and a specific ester monomer) rather than a single compound. This composite polymer structure combines the benefits of different functional groups to achieve both high temperature stability and high voltage resistance simultaneously, resolving the contradiction between thermal stability and electrical performance.
Solution Approach 2:
The patent specifies precise parameter ranges for the copolymer composition (monomer ratios, molecular weight, carboxyl group content) and electrolyte concentration (10-30 wt%). By optimizing these parameters, the electrolyte achieves both high temperature stability and high voltage resistance, transforming the insufficient performance of conventional single-compound electrolytes into superior dual-performance characteristics.
2Ease of manufacture
If conventional electrolytes are used, then manufacturing is simple, but both initial conductivity and voltage resistance are insufficient
Solution Approach 1:
The patent maintains manufacturing simplicity by using a copolymerization process with well-established chemistry, while dramatically improving initial conductivity through parameter optimization: specifying 10-30 wt% electrolyte concentration, controlling carboxyl group content at 0.5-2.0 mmol/g, and setting molecular weight between 1,000-50,000. These parameter changes enable high initial conductivity without complicating the manufacturing process.
3Reliability
If electrolyte concentration is increased to improve conductivity, then initial conductivity improves, but voltage resistance and heat resistance deteriorate
Solution Approach 1:
The patent identifies an optimal electrolyte concentration range of 10-30 wt% that simultaneously achieves high initial conductivity (0.2-3.0 mS/cm) and excellent heat resistance. This parameter optimization prevents the trade-off where higher concentration improves conductivity but harms thermal stability, as the copolymer structure maintains stability within this optimized concentration window.
Solution Approach 2:
The copolymer electrolyte's composite structure with specific monomer composition (including ester groups and carboxyl groups in controlled ratios) enables the electrolyte to maintain both high conductivity and heat resistance at the same concentration level, unlike conventional electrolytes that require compromising one property for the other.
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 results in electrolytic capacitors with high voltage resistance, high initial conductivity, and excellent heat resistance, as demonstrated by improved electrical conductivity retention and sparking voltage performance.
Implementation Method 1
the electrolyte contains an anion and a cation, and the anion is an anion having a structure obtained by removing at least one hydrogen ion from a carboxy group from a copolymer having a carboxy group
Data Source
AI summary
An electrolytic solution for an electrolytic capacitor comprising an electrolyte and a solvent, in which the electrolyte contains an anion and a cation, and the anion is an anion having a structure obtained by removing at least one hydrogen ion from a carboxy group from a copolymer having a carboxy group, the copolymer having a carboxy group has a substituent having 5-20 carbon atoms bonded to a carbon atom of a backbone of the copolymer, the copolymer having a carboxy group does not include a hydroxy group or if it does include a hydroxy group, the content of monomers including a hydroxy group in the structural monomers of the copolymer having a carboxy group is less than 60 wt % based on the weight of all monomers constituting the copolymer having a carboxy group, and the copolymer satisfies a specific condition, and the solvent contains ethylene glycol.