Solid Electrolytic Capacitor with Conductive Polymer for High Temperature
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Solution Overview
Problem
Conventional solid electrolytic capacitors using in situ polymerized polymers exhibit high leakage current and fail at high voltages or temperatures, particularly when subjected to voltage spikes or multiple pulses.
Innovation Solution
A capacitor assembly is developed with a solid electrolyte containing an intrinsically conductive polymer with specific repeating units, which maintains excellent electrical properties at high temperatures, including capacitance stability and resistance to voltage pulses, by using a dielectric formed on a sintered porous anode body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If in situ polymerized polymers are used as solid electrolyte, then low ESR and non-burning failure mode are achieved, but high leakage current and failure at high voltages occur
Solution Approach 1:
The patent modifies the chemical structure of the intrinsically conductive polymer by introducing specific repeating units with ether linkages and adjustable chain lengths (parameters a and b in formula I). This structural parameter change optimizes the balance between conductivity and stability, reducing leakage current while maintaining low ESR performance.
Solution Approach 2:
The patent creates a composite solid electrolyte system combining intrinsically conductive polymer with specific molecular architecture (formula I) that integrates both low-resistance conductivity and high-voltage stability properties within a single material structure, eliminating the need for separate components.
2Reliability
If PEDOT:PSS dispersions are used as solid electrolyte, then improved properties are achieved, but capacitance significantly degrades at high temperatures
Solution Approach 1:
The patent designs the intrinsically conductive polymer with specific repeating units containing ether linkages and controlled alkyl chain lengths (parameters a and b), which provide thermal stability and prevent capacitance degradation at elevated temperatures while maintaining electrical conductivity.
Solution Approach 2:
The patent introduces specific functional groups (ether linkages) and side chain structures at particular positions within the polymer backbone, creating localized regions with enhanced thermal stability that protect the overall capacitor structure from high-temperature degradation.
3Power
If conventional solid electrolytic capacitors are subjected to high voltages or multiple voltage pulses, then operational requirements are met, but failure occurs due to high leakage current
Solution Approach 1:
The patent optimizes the molecular parameters of the intrinsically conductive polymer (formula I), including the ether linkage structure and side chain length parameters, to enhance electron mobility and voltage breakdown resistance, enabling the capacitor to withstand high voltages and voltage pulses without failure.
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 capacitor assembly demonstrates stable capacitance values and resistance to high temperatures and voltages, with capacitance retention of 0.7 to 1.0 after exposure to 105°C for up to 550 hours and under multiple voltage pulses, maintaining performance even at elevated temperatures.
Implementation Method 1
The solid electrolyte includes an intrinsically conductive polymer containing repeating units having the following formula (I)... maintains excellent electrical properties at high temperatures
Implementation Method 2
a capacitor element that includes an anode that contains a dielectric formed on a sintered porous body
Data Source
AI summary
A capacitor assembly that is capable of exhibiting good properties under hot conditions. The ability to perform under such conditions is due in part to the use of an intrinsically conductive polymer in the solid electrolyte that contains repeating units having the following formula (I):wherein,R is (CH2)a—O—(CH2)b;a is from 0 to 10;b is from 1 to 18;Z is an anion; andX is a cation.The resulting capacitor assembly may exhibit excellent electrical properties even when exposed to high temperatures.