Lithium Ion Solid Electrolyte Capacitor with Oxide Particles
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Solution Overview
Problem
Conventional capacitors using solid electrolytes have insufficient capacity, and existing techniques do not adequately address the need for larger electrostatic capacity.
Innovation Solution
A capacitor design incorporating an oxide-based lithium ion conductive solid electrolyte with oxide particles, where the base material is a main component (≥50 vol%) and the oxide particles have no ionic conductive property, with a content of 5 vol% to 33 vol% and an average particle diameter ≤1.1 μm, enhancing capacity without blocking lithium ion conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If only a solid electrolyte is simply used, then the capacitor structure is simple, but the electrostatic capacity is insufficient
Solution Approach 1:
The patent applies composite materials by combining an oxide-based lithium ion conductive solid electrolyte base material with dispersed oxide particles. This composite structure increases the electrostatic capacity while maintaining ionic conductivity, as the oxide particles create additional charge storage sites without blocking lithium ion transport pathways.
Solution Approach 2:
The patent applies local quality by creating regions with different properties within the solid electrolyte. The oxide particles are dispersed throughout the base material, creating local variations in electrical properties. These localized regions provide enhanced charge storage capacity while the surrounding base material maintains ionic conductivity, resolving the contradiction between capacity and simplicity.
2Quantity of substance
If oxide particles are added to increase capacity, then the electrostatic capacity increases, but the ionic conductivity may be reduced if particles block conduction paths
Solution Approach 1:
The patent applies parameter changes by carefully controlling the content of oxide particles within a specific range (5-33 vol%). This optimized concentration ensures sufficient charge storage capacity while preventing excessive particle accumulation that would block lithium ion conduction paths. The particle size is also controlled (average diameter ≤1.1 μm) to maintain conductivity.
Solution Approach 2:
The patent applies porous materials principles by creating a dispersed particle structure within the solid electrolyte. The oxide particles are distributed throughout the base material, creating a structure with interconnected pathways that allow lithium ion transport while providing additional charge storage sites. This porous-like structure prevents complete blockage of conduction paths.
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 achieves a significant increase in electrostatic capacity, with specific capacities exceeding 1500 μF/cm², particularly when the oxide particles are within the specified range, optimizing lithium ion conductivity and overall performance.
Implementation Method 1
an oxide-based lithium ion conductive solid electrolyte as a base material
Data Source
AI summary
To provide a capacitor capable of having a larger capacity than a case where only a solid electrolyte is simply used as a dielectric material of the capacitor. The capacitor (1) includes a solid electrolytic body (3) and a plurality of electrodes (5, 7) which is formed on the solid electrolytic body (3) and disposed opposite to each other with the solid electrolytic body (3) interposed therebetween, and the solid electrolytic body (3) includes an oxide-based lithium ion conductive solid electrolyte as a base material and contains oxide particles formed of a part of elements configuring the base material.