Electrolytic Capacitor Quinone Additive Heat Resistance
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Solution Overview
Problem
Electrolytic capacitors with solid electrolyte layers deteriorate at high temperatures, leading to increased equivalent series resistance (ESR) due to de-doping of polymer dopants, which affects their electrical conductivity and reliability.
Innovation Solution
Incorporating a quinone compound with a second anionic group into the solid electrolyte layer, in addition to a π-conjugated polymer doped with a polymer dopant having a first anionic group, helps maintain the conductivity and prevent de-doping, thereby enhancing heat resistance and reducing ESR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte layer containing a π-conjugated polymer and polymer dopant is used, then high electrical conductivity and low ESR are achieved, but the solid electrolyte layer deteriorates at high temperatures leading to increased ESR
Solution Approach 1:
A quinone compound acts as an intermediary substance between the polymer dopant and the π-conjugated polymer. The quinone compound forms a complex with the polymer dopant, preventing its de-doping from the π-conjugated polymer at high temperatures. This intermediary complex maintains the doping state and preserves electrical conductivity under thermal stress.
Solution Approach 2:
The solid electrolyte layer is formulated as a composite material containing three components: π-conjugated polymer, polymer dopant, and quinone compound. This composite structure leverages the synergistic effects of all components, where the quinone compound enhances the thermal stability of the dopant-polymer interaction, thereby improving overall heat resistance while maintaining conductivity.
2Reliability
If polymer dopant is doped in π-conjugated polymer to achieve high conductivity, then low ESR is obtained, but de-doping occurs at high temperatures causing performance deterioration
Solution Approach 1:
The quinone compound serves as a stabilizing intermediary that forms a complex with the polymer dopant. This complexation prevents the dopant from detaching from the π-conjugated polymer chain at elevated temperatures, thereby maintaining both the compositional stability and electrical conductivity of the solid electrolyte layer.
Solution Approach 2:
The addition of the quinone compound changes the chemical parameters of the solid electrolyte system by introducing a new molecular species that interacts with the polymer dopant. This parameter change (formation of quinone-dopant complex) increases the binding energy between dopant and polymer, preventing de-doping and maintaining conductivity stability at high temperatures.
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 addition of a quinone compound in the solid electrolyte layer effectively suppresses the increase in ESR and maintains high electrical conductivity even at elevated temperatures, ensuring the electrolytic capacitor's performance and longevity.
Implementation Method 1
the additive including a quinone compound having a second anionic group... effectively suppresses the increase in ESR and maintains high electrical conductivity
Implementation Method 2
The solid electrolyte layer contains an electrically conductive material, and the electrically conductive material containing a π-conjugated polymer, and a polymer dopant doped in the π-conjugated polymer
Data Source
AI summary
An electrolytic capacitor including an anode body having a dielectric layer, and a solid electrolyte layer. The solid electrolyte layer contains an electrically conductive material, and an additive. The conductive material contains a π-conjugated polymer, and a polymer dopant doped in the π-conjugated polymer and having a first anionic group. The additive includes a quinone compound having a second anionic group.