Electrolytic Capacitor Electrolyte Composition Against Anode Erosion
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Solution Overview
Problem
The use of a composite acid compound in electrolytic capacitors leads to hydrolysis when combined with water, resulting in acid decomposition that can cause erosion of the anode body, increasing equivalent series resistance (ESR) and leak current.
Innovation Solution
Incorporating a coordination compound with a central atom and an organic molecule having oxygen atoms bonded to carbonyl groups into the liquid component, along with an antioxidant and a polyol compound, to suppress the erosion of the anode body and reduce ESR and leak current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water is included in the liquid component, then oxygen is supplied to the anode body and repair functions for the dielectric layer are improved, but the water causes the composite acid compound to undergo hydrolysis, generating acid that erodes the anode body and increases ESR and leak current
Solution Approach 1:
The patent changes the chemical structure of the acid component from a composite acid compound (prone to hydrolysis) to a coordination compound with enhanced stability. This parameter change in chemical composition allows the liquid component to maintain water content for dielectric repair while preventing hydrolysis-induced anode erosion through the superior stability of the coordination compound structure
Solution Approach 2:
The patent employs a coordination compound as a composite material comprising a central atom (boron or aluminum) coordinated with organic molecules containing carbonyl groups. This composite structure provides both the necessary chemical stability to prevent hydrolysis and the functional properties to suppress anode erosion, while allowing water to remain in the liquid component for dielectric layer repair
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 proposed solution effectively suppresses the increase in ESR and leak current, providing improved thermal stability and repair functions for the dielectric layer, even under high temperature and long-term use conditions.
Implementation Method 1
the acid component includes a coordination compound including a central atom, and an organic molecule having a plurality of coordination atoms bonded to the central atom, and at least one of the plurality of coordination atoms is an oxygen atom bonded to a carbonyl group
Implementation Method 2
The antioxidant is used for a purpose of suppressing deterioration by oxidation of a conductive polymer compound
Implementation Method 3
When the liquid component contains water, oxygen is supplied to the anode body, and functions by the liquid component to repair defects in the dielectric layer are brought out easily
Data Source
AI summary
An electrolytic capacitor includes a capacitor element and a liquid component, wherein the capacitor element includes an anode body having a dielectric layer on a surface thereof, and a conductive polymer compound covering at least a portion of the dielectric layer. The liquid component includes an acid component, a base component, a solvent, and an antioxidant. The solvent includes water and a polyol compound. The acid component includes a coordination compound including a central atom, and an organic molecule having a plurality of coordination atoms bonded to the central atom, and at least one of the plurality of coordination atoms is an oxygen atom bonded to a carbonyl group.