Solid Electrolytic Capacitor Nitro-Alcohol Defect Repair
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Solution Overview
Problem
Conventional solid electrolytic capacitors have high leakage current and limited lifetime due to defects in the oxide film, which are not efficiently repaired, leading to increased pressure and potential expansion when used at high temperatures or over time.
Innovation Solution
A solid electrolytic capacitor design that incorporates a water-soluble high-molecular weight compound solution comprising water, alcohol with a nitro group, and a conductive high-molecular weight compound, which surrounds the solid electrolyte, allowing for efficient defect repair and minimizing pressure increase by absorbing hydrogen gas, thereby extending the capacitor's lifetime and reducing leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-soluble high-molecular weight compound in a liquid form is introduced into the gap between anode foil and cathode foil, then defect repair capability is improved, but leakage current increases
Solution Approach 1:
The patent changes the chemical composition parameters of the liquid compound by introducing a nitro group into the molecular structure. This parameter change modifies the compound's properties to reduce leakage current while preserving defect repair capability through the retained moisture content and chemical reactivity.
Solution Approach 2:
The patent creates a composite liquid compound by combining a water-soluble high-molecular weight compound with a nitro group. This composite structure integrates the moisture-retaining properties of the high-molecular weight compound with the electron-withdrawing properties of the nitro group, achieving both defect repair and low leakage current.
2Reliability
If conventional solid electrolytic capacitor is used at high temperatures or for long time, then moisture repairs oxide film defects, but pressure increases and expansion occurs
Solution Approach 1:
The nitro group introduction changes the thermal and chemical parameters of the liquid compound, enabling it to suppress hydrogen gas generation and pressure increase while maintaining oxide film defect repair capability through controlled moisture release at elevated temperatures.
3Reliability
If water-soluble high-molecular weight compound surrounds solid electrolyte, then separator deterioration is suppressed, but leakage current increases
Solution Approach 1:
The patent modifies the chemical parameters of the protective liquid compound by adding a nitro group, which changes its electrical properties to reduce leakage current while maintaining its protective function against separator deterioration through moisture retention and physical barrier properties.
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 design results in a solid electrolytic capacitor with lower defect density, reduced leakage current, and minimal expansion when exposed to high temperatures, ensuring a longer lifespan and improved performance.
Implementation Method 1
a water-soluble high-molecular weight compound solution which is formed of a water-soluble high-molecular weight compound in a liquid form, water and alcohol having a nitro group are introduced into a gap formed between an anode foil and a cathode foil in a state where the water-soluble high-molecular weight compound solution surrounds the solid electrolyte
Implementation Method 2
alcohol having a nitro group, are introduced into a gap formed between an anode foil and a cathode foil in a state where the water-soluble high-molecular weight compound solution surrounds the solid electrolyte
Data Source
AI summary
Provided is a solid electrolytic capacitor having a lower leakage current than a conventional solid electrolytic capacitor. The solid electrolytic capacitor includes: an anode foil having a surface on which an oxide film is formed; a cathode foil; and a separator disposed between the anode foil and the cathode foil, wherein a solid electrolyte made of a conductive high-molecular weight compound in a fine particle form and a water-soluble high-molecular weight compound solution which is formed of a water-soluble high-molecular weight compound in a liquid form, water and alcohol having a nitro group are introduced into a gap formed between the anode foil and the cathode foil in a state where the water-soluble high-molecular weight compound solution surrounds the solid electrolyte.