Layered Solid-Electrolytic Capacitor for High Capacitance Density
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Solution Overview
Problem
The challenge of miniaturizing solid-electrolytic capacitors while maintaining their capacitance has not been adequately addressed, necessitating an improvement in capacitance appearance ratio per unit volume.
Innovation Solution
A solid-electrolytic capacitor design featuring a first ion-conducting electrolyte layer and a second electron-conducting electrolyte layer, with the first layer immobilized using silane coupling agents to prevent ionic liquid leakage, and a conductive polymer layer for enhanced conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of solid-electrolytic capacitors is reduced to meet miniaturization requirements, then the volume decreases, but the capacitance appearance ratio deteriorates
Solution Approach 1:
The solid electrolyte layer is segmented into two distinct functional layers: an ion-conducting electrolyte layer (first electrolyte layer) and an electron-conducting electrolyte layer (second electrolyte layer). This segmentation allows each layer to perform its specific function optimally, with the ion-conducting layer enabling ion transport and the electron-conducting layer providing electron transport pathways, thereby maintaining high capacitance appearance ratio even in miniaturized capacitors
Solution Approach 2:
The patent employs composite material structure by combining different types of electrolyte materials with complementary properties. The ion-conducting electrolyte (e.g., ionic liquid or polymer electrolyte) and electron-conducting electrolyte (e.g., conductive polymer) are combined in a layered configuration, creating a composite solid electrolyte system that achieves both high ion conductivity and high electron conductivity, thus improving capacitance density in small-volume capacitors
2Device complexity
If a single-layer solid electrolyte structure is used, then the device complexity is low, but the capacitance appearance ratio is insufficient
Solution Approach 1:
The electrolyte system is divided into two functional layers with distinct roles. The first electrolyte layer (ion-conducting) and second electrolyte layer (electron-conducting) are stacked in sequence on the dielectric layer, creating a segmented structure that enhances overall performance while maintaining manufacturing simplicity through a straightforward layered deposition process
Solution Approach 2:
The solid electrolyte layer is designed to perform multiple functions through its composite structure: the ion-conducting electrolyte layer handles ion transport and storage, while the electron-conducting electrolyte layer provides electron transport and additional capacitance. This multi-functionality allows a single electrolyte layer assembly to achieve high capacitance appearance ratio without significantly increasing device complexity
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 design achieves a high capacitance appearance ratio and prevents deterioration due to ionic liquid outflow, ensuring reliable capacitor performance.
Implementation Method 1
the first electrolyte layer is an ion-conducting electrolyte layer
Implementation Method 2
the second electrolyte layer is an electron-conducting electrolyte layer
Implementation Method 3
a dielectric layer formed on the anode member
Data Source
AI summary
A solid-electrolytic capacitor according to an aspect of the present disclosure includes an anode member made of a valve metal, a dielectric layer formed on the anode member, and a solid electrolyte layer formed on the dielectric layer. The solid electrolyte layer includes a first electrolyte layer formed on the dielectric layer and a second electrolyte layer formed on the first electrolyte layer, in which the first electrolyte layer is an ion-conducting electrolyte layer and the second electrolyte layer is an electron-conducting electrolyte layer.