Solid Electrolyte Layer Control for Heat-Resistant Capacitors
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Solution Overview
Problem
Conventional solid electrolytic capacitors suffer from deterioration of the conductive polymer component due to air exposure, particularly in high-temperature environments, leading to degraded conductivity and capacitor performance.
Innovation Solution
The use of tripolar electrolytic polymerization with a reference electrode to control the potential of the anode precisely, enhancing the orientation and crystallinity of the conjugated polymer in the solid electrolyte layer, thereby reducing oxygen permeability and maintaining high conductivity even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solid electrolyte layer is exposed to high temperature, then the oxygen permeability increases leading to deterioration of conductive polymer, but the heat resistance and reliability deteriorate
Solution Approach 1:
The patent applies parameter changes by controlling the oxygen permeability of the solid electrolyte layer to be less than or equal to 1.0 cm³/m²·24 h·atm after heating at 230°C for 5 hours. This specific parameter control prevents excessive oxygen permeability at high temperatures, thereby suppressing deterioration of the conductive polymer component and improving heat resistance and reliability.
2Reliability
If the conductive polymer component is deteriorated by oxygen and moisture, then the conductivity is degraded, but the capacitor performance deteriorates
Solution Approach 1:
The patent creates an inert environment by controlling the solid electrolyte layer to have low oxygen permeability (less than or equal to 1.0 cm³/m²·24 h·atm after heating at 230°C for 5 hours). This effectively isolates the conductive polymer component from oxygen and moisture, preventing deterioration and maintaining conductivity and capacitor performance even in high-temperature environments.
3Object-affected harmful factors
If the conjugated polymer orientation is low, then air entry is facilitated at high temperature, but the oxygen permeability increases
Solution Approach 1:
The patent applies parameter changes by optimizing the orientation of conjugated polymer in the solid electrolyte layer. This enhanced orientation reduces oxygen permeability and prevents air entry at high temperatures, thereby suppressing conductive polymer deterioration and improving overall heat resistance.
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 solid electrolytic capacitor achieves improved heat resistance and reliability by suppressing oxidation reactions and maintaining electrostatic capacity, even when exposed to high temperatures.
Implementation Method 1
suppressing oxidation reactions and maintaining electrostatic capacity, even when exposed to high temperatures
Data Source
AI summary
A solid electrolytic capacitor element includes an anode body, a dielectric layer formed on a surface of the anode body, and a cathode part covering at least a part of the dielectric layer. The cathode part includes a solid electrolyte layer covering the at least the part of the dielectric layer. The solid electrolyte layer includes a conductive polymer component containing a conjugated polymer. An oxygen permeability P1 of the solid electrolyte layer after heating at 230° C. for 5 hours is less than or equal to 1.0 cm3/m2·24 h·atm.