Capacitor Electrolyte Composition for High-Voltage Conductivity
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Solution Overview
Problem
Standard electrolytes in aluminum electrolytic capacitors fail to meet the requirements for high withstand voltage, high electrical conductivity, and high spark voltage, limiting their application in medium and high-voltage applications.
Innovation Solution
A new electrolyte composition is developed, comprising a compound with a specific chemical structure and its ammonium salt, along with a diacid and its ammonium salt, dissolved in an organic solvent, which improves the conductivity and spark voltage performance of capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard electrolytes are used in aluminum electrolytic capacitors, then the basic energy storage function is maintained, but the withstand voltage, electrical conductivity, and spark voltage characteristics are insufficient for medium and high-voltage applications
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing a new compound class (cyclic carboxylic acid compounds with specific molecular structures containing carbonyl and carboxyl groups) and controlling the content ratio of different electrolyte components. This enables the electrolyte to achieve high electrical conductivity and breakdown voltage characteristics suitable for medium and high-voltage applications up to 450V
Solution Approach 2:
The patent creates a composite electrolyte system by combining the new cyclic carboxylic acid compound (compounds of formula 1) with conventional electrolyte components including diacids, ammonium salts, and organic solvents. This composite approach synergistically improves both the conductivity and withstand voltage characteristics, enabling the capacitor to meet medium and high-voltage requirements
2Reliability
If the electrolyte composition is optimized for high conductivity, then electrical performance improves, but the stability over extended temperature exposure may deteriorate
Solution Approach 1:
The patent introduces a specifically designed cyclic carboxylic acid compound with functional groups positioned at specific locations in the molecular structure (carbonyl group and carboxyl group in defined relative positions). This local structural arrangement enables the molecule to simultaneously provide high ionic conductivity through its polar groups while maintaining thermal stability through the rigid cyclic backbone structure
Solution Approach 2:
The patent employs a small content ratio (0.01-5% by weight) of the new cyclic carboxylic acid compound within the overall electrolyte composition. This minor additive approach allows the compound to exert significant beneficial effects on conductivity and stability without compromising the overall composition stability during extended temperature exposure
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 new electrolyte composition enhances the capacitance, dissipation factor, equivalent series resistance, and leakage current of capacitors, while maintaining reliability over extended temperature exposure, thus addressing the limitations of standard electrolytes.
Implementation Method 1
diacids and ammonium salts thereof are often dissolved in organic solvents to prepare the electrolyte
Implementation Method 2
a new electrolyte composition is needed, to resolve the above-mentioned issues... high withstand voltage, high electrical conductivity, and high spark voltage
Data Source
AI summary
An electrolyte is provided, which includes organic solvent; and (1) a compound and an ammonium salt thereof, (2) a diacid and an ammonium salt thereof, or (3) a combination thereof. The compound has a chemical structure ofwherein R1 is C1-8 alkyl group, C1-8 alkenyl group, C1-8 alkynyl group, or aromatic group; and R2 is —(CnH2n)—OH, and n is an integer from 2 to 8. The diacid has a chemical structure ofwherein R3 is C1-8 alkyl group, C1-8 alkenyl group, C1-8 alkynyl group, or aromatic group.