Solid Electrolyte Capacitor with Hydrophilic Polymer for Oxide Film Repair
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Solution Overview
Problem
Conventional solid electrolyte capacitors face challenges in achieving high breakdown strength, low leakage current, and extended lifetime due to defects in the oxide film, which can lead to deterioration and reduced performance over time.
Innovation Solution
A solid electrolyte capacitor design that incorporates a hydrophilic polymer compound with specific chemical structures and properties, allowing for moisture retention and self-repair of oxide film defects, eliminating the need for oxidizing agents and enhancing the capacitor's durability and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte capacitors are manufactured using ion conductive compounds, then conductivity of the solid electrolyte layer is increased and ESR is reduced, but the oxide film deteriorates due to oxidizing agents for polymerization
Solution Approach 1:
The patent removes the oxidizing agent component from the polymerization process entirely. Instead of using conventional ion conductive compounds that require oxidizing agents for polymerization, the invention employs hydrophilic polymer compounds that can be polymerized without oxidizing agents, thereby extracting the harmful element while maintaining the desired functionality.
Solution Approach 2:
The patent introduces a hydrophilic polymer compound as an intermediary substance that serves multiple functions: it acts as the polymerization substrate, provides ion conductivity, and crucially, supplies oxygen to repair oxide film defects without requiring external oxidizing agents. This intermediary compound mediates between the need for polymerization and the need to protect the oxide film.
2Ease of manufacture
If oxidizing agents for polymerization are used to form solid electrolyte layer, then polymerization occurs and solid electrolyte layer is formed, but the oxide film deteriorates causing increased leakage current
Solution Approach 1:
The hydrophilic polymer compound contains embedded oxygen atoms within its molecular structure that can be released to repair oxide film defects. This self-service mechanism eliminates the need for external oxidizing agents, allowing the system to maintain and repair itself without introducing harmful substances that would increase leakage current.
3Reliability
If oxide film defects occur during manufacturing or use, then capacitor performance degrades, but ion conductive compound can repair defects by supplying oxygen
Solution Approach 1:
The hydrophilic polymer compound continuously supplies oxygen to repair oxide film defects throughout the capacitor's operational life. This continuous repair mechanism ensures that the oxide film maintains its integrity and breakdown strength over extended periods, thereby extending the capacitor's lifetime through sustained protective action.
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 results in a solid electrolyte capacitor with improved breakdown strength, low leakage current, and extended lifetime by minimizing moisture loss and maintaining oxide film integrity under varying temperatures and usage conditions, making it suitable for harsh environments.
Implementation Method 1
a hydrophilic polymer compound having a specific chemical structure and capable of retaining moisture
Implementation Method 2
a solid electrolyte which contains conductive fine particles containing a conductive polymer compound
Data Source
AI summary
A solid electrolyte capacitor includes an anode foil on a surface of which an oxide film is formed, a cathode foil, and a separator. A gap between the anode foil and the cathode foil is filled with a solid electrolyte which contains a conductive fine particles containing a conductive polymer compound and a hydrophilic polymer compound. The hydrophilic polymer compound has a structure expressed by a following chemical formula (I) and a structure expressed by a following chemical formula (II).—(R1—O)— (I)—(R2—O)— (II)In the formula (I) and the formula (II), R1 and R2 are groups selected from the set consisting of a substituted or unsubstituted alkylene, a substituted or unsubstituted alkenylene, and a substituted or unsubstituted phenylene, and represent mutually different groups.