Solid electrolyte assembly having intermediate layer
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Solution Overview
Problem
Existing devices using solid electrolytes with oxide ion conductivity require higher operating temperatures to achieve optimal performance, necessitating a solution to enhance conductivity at lower temperatures and improve overall device efficiency.
Innovation Solution
Incorporating an intermediate layer made of cerium oxide containing lanthanum and a rare-earth element between the solid electrolyte and electrodes, specifically using a cerium oxide doped with a rare-earth element to form a solid solution, enhances oxide ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional solid electrolyte assembly is used, then the device structure is simple, but the oxide ion conductivity is insufficient and requires high operating temperatures
Solution Approach 1:
An intermediate layer made of cerium oxide containing lanthanum and a rare-earth element (Gd, Dy, Ho, Er, Tm, Yb, or Lu) is introduced between the solid electrolyte and the electrode. This intermediate layer acts as a mediator that enhances oxide ion conductivity at the interface, allowing the device to operate at lower temperatures while maintaining reliable performance. The intermediate layer composition is specifically designed to facilitate oxide ion transport between the solid electrolyte and electrode.
2Use of energy by moving object
If the operating temperature is reduced, then the activation time is shortened and power consumption is reduced, but the oxide ion conductivity decreases
Solution Approach 1:
The composition parameters of the intermediate layer are optimized to contain cerium oxide with specific dopants (lanthanum and rare-earth elements Gd, Dy, Ho, Er, Tm, Yb, or Lu) at controlled ratios. This parameter optimization enables the intermediate layer to maintain high oxide ion conductivity even at reduced operating temperatures, thereby lowering power consumption while preserving device reliability.
3Reliability
If an intermediate layer is added to improve oxide ion conductivity, then the conductivity increases, but the device complexity increases
Solution Approach 1:
The intermediate layer is constructed using a composite material system based on cerium oxide doped with lanthanum and specific rare-earth elements. This composite material approach enhances oxide ion conductivity through the synergistic effect of multiple elements, achieving improved performance without requiring complex multi-layer structures or additional components.
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 significantly improves the oxide ion conductivity of the solid electrolyte assembly, allowing for lower operating temperatures and reduced electric resistance, thereby enhancing device performance.
Implementation Method 1
an intermediate layer made of a cerium oxide containing lanthanum and a rare-earth element excluding lanthanum and cerium
Implementation Method 2
the intermediate layer is made of a cerium oxide containing lanthanum and a rare-earth element excluding lanthanum and cerium
Data Source
AI summary
A solid electrolyte assembly has an anode, a cathode, and a solid electrolyte layer located therebetween. An intermediate layer is provided between the anode or the cathode and the solid electrolyte layer. The intermediate layer is made of a cerium oxide containing lanthanum and a rare-earth element excluding lanthanum and cerium. The solid electrolyte layer contains an oxide of lanthanum. Preferably, the solid electrolyte layer contains a composite oxide of lanthanum and silicon. Also, preferably, the intermediate layer is made of a cerium oxide containing lanthanum and any one of samarium, gadolinium, yttrium, erbium, ytterbium, and dysprosium.