All-solid-state capacitor with perovskite electrolyte for high capacitance
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Solution Overview
Problem
Existing capacitors face challenges in achieving high capacitance while being compact, with multilayer ceramic capacitors using barium titanate facing limitations in downsizing and frequency responsiveness, and electric double layer capacitors experiencing liquid leakage and poor frequency characteristics.
Innovation Solution
An all-solid-state capacitor utilizing an inorganic solid electrolyte with a perovskite crystal structure, composed of Li, M (Group 2 elements), Ti, and M' (Group 5 elements), and a grain boundary phase, which allows for high capacitance and excellent frequency characteristics by facilitating Li ion migration and interfacial polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If barium titanate is used as a dielectric body to achieve high capacitance, then the relative permittivity increases, but the capacitor size cannot be reduced further
Solution Approach 1:
The patent changes the fundamental parameter of the electrolyte from liquid to solid state, specifically using an inorganic solid electrolyte with perovskite crystal structure. This parameter change enables the capacitor to achieve high capacitance through solid-state interfacial polarization without requiring large physical dimensions, thus resolving the contradiction between high capacitance and compact size
Solution Approach 2:
The patent employs composite material design by combining inorganic solid electrolyte with perovskite crystal structure (comprising Li, M from Group 2, Ti, and M' from Group 5) with organic electrolyte or liquid electrolyte in specific configurations. This composite approach enables high capacitance through multiple mechanisms including solid-state interfacial polarization and ion migration, while maintaining compact form factor
2Quantity of substance
If electrolytic solution is used to collect ions in current collector for high relative permittivity, then the relative permittivity increases, but the responsiveness to power-source driving frequency decreases
Solution Approach 1:
The patent changes the state parameter of the electrolyte from liquid to solid, using inorganic solid electrolyte with perovskite structure. This parameter change fundamentally improves frequency responsiveness because solid-state ion migration and interfacial polarization occur more rapidly than liquid electrolyte ion collection, enabling high relative permittivity (5000 or above) to be maintained at driving frequencies of 1 kHz and higher
Solution Approach 2:
The patent substitutes the liquid electrolyte system with a solid electrolyte system, replacing the mechanism of ion collection in liquid with solid-state ion migration and interfacial polarization. This substitution eliminates the sluggish response characteristic of liquid electrolytes while achieving comparable or superior relative permittivity through different physical mechanisms
3Quantity of substance
If liquid electrolyte is used in electric double layer capacitor, then high relative permittivity can be achieved, but liquid leakage occurs requiring watertight structure
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from liquid to solid by using inorganic solid electrolyte with perovskite crystal structure. This parameter change eliminates liquid leakage issues entirely while maintaining high relative permittivity, as the solid electrolyte is contained within the capacitor structure without requiring additional watertight sealing mechanisms
Solution Approach 2:
The patent extracts and removes the liquid electrolyte component that causes leakage problems, replacing it with solid electrolyte material. This extraction eliminates the harmful liquid leakage effect while preserving the beneficial high relative permittivity property through alternative solid-state mechanisms
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 solution enables an all-solid-state capacitor with high capacitance, improved frequency responsiveness, and compact design, reducing the need for expensive materials and minimizing liquid leakage risks.
Implementation Method 1
A-site elements of the main crystal phase comprising Li and M which is at least one of elements in Group 2 of the Periodic Table of Elements
Implementation Method 2
the inorganic solid electrolyte having a main crystal phase of perovskite crystal structure that is expressed by a general formula, ABO3
Data Source
AI summary
The disclosure relates to an all-solid-state capacitor which has a high capacitance, is excellent in frequency characteristics, and can be made compact. An all-solid-state capacitor of the disclosure includes an inorganic solid electrolyte, and a pair of current collectors disposed so as to hold the inorganic solid electrolyte in between, the inorganic solid electrolyte having a main crystal phase of perovskite crystal structure that is expressed by a general formula, ABO3. A-site elements include two different elements, namely Li and M which is at least one of elements in Group 2 of the Periodic Table of Elements, and B-site elements include two different elements, namely Ti and M′ which is at least one of elements in Group 5 of the Periodic Table of Elements.