Ceramic Fiber Mat Anode Support for Thin SOFC Electrolytes

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Solution Overview

Problem

Thin electrolyte layers in solid oxide fuel cells are prone to damage during manufacturing, reduction-oxidation cycling, and thermal cycling, leading to reduced mechanical stability and performance.

Innovation Solution

An electrochemical cell design featuring an anode support made of a mat of ceramic support fibers with an embedded cermet matrix, which provides structural support and resistance to cambering, using an electrospinning process to create high-aspect-ratio fibers and a tape casting or slot die coating process to embed the cermet matrix.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If thin electrolyte layers are used to provide high ionic conductivity, then ionic conductivity is improved, but mechanical stability and reliability deteriorate due to damage during manufacturing, reduction-oxidation cycling, and thermal cycling

Engineering Contradiction:

Improveionic conductivityVSAvoidmechanical stability

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The anode support is segmented into a composite structure consisting of a ceramic fiber mat framework embedded with cermet matrix material. This segmentation allows the thin electrolyte layer to be supported by the rigid ceramic fiber network, distributing mechanical stresses and preventing damage during manufacturing and operation while maintaining the thin geometry needed for high ionic conductivity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The anode support uses a composite material system combining ceramic fibers (providing mechanical strength and thermal stability) with cermet matrix material (providing electrical conductivity and structural integrity). This composite structure enables the thin electrolyte layer to maintain both mechanical stability and ionic conductivity by leveraging the complementary properties of the constituent materials

Inventive Principle:

Principle #40Composite materials

2Device complexity

If thin electrolyte layers are used to reduce manufacturing complexity, then device complexity is reduced, but manufacturing precision requirements increase due to the need to prevent damage during assembly and operation

Engineering Contradiction:

Improvestructure complexityVSAvoidelectrolyte layer integrity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The ceramic fiber mat is positioned beneath the thin electrolyte layer before assembly, creating a cushioning support network that prevents direct contact between the fragile electrolyte and rigid components. This pre-positioned cushioning structure protects the electrolyte during manufacturing and operation, reducing the precision requirements for handling and assembly while maintaining the thin electrolyte geometry

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Strength

If ceramic fiber mats are used to support thin electrolyte layers, then mechanical stability is improved, but manufacturing process complexity increases due to the need to embed cermet matrix material

Engineering Contradiction:

Improvemechanical stabilityVSAvoidanode support structure

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The manufacturing process merges the ceramic fiber mat placement and cermet matrix embedding into a single integrated step. The cermet slurry is applied directly to the ceramic fiber mat, and both components are sintered together in one firing cycle, creating the composite anode support structure. This merging reduces the number of separate manufacturing steps while achieving the desired mechanical stability

Inventive Principle:

Principle #5Merging (Combining)

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 enhances mechanical stability and reliability by preventing electrolyte damage, maintaining high ionic conductivity, and reducing redox instability, thereby improving cell performance and longevity.

Implementation Method 1

using an electrospinning process to create high-aspect-ratio fibers

Methodology Applied

Scientific EffectElectrospinning: Electrohydrodynamics

Implementation Method 2

using a tape casting or slot die coating process to embed the cermet matrix

Methodology Applied

Scientific EffectTape casting: Deposition (physical)

Data Source

PatentUS20250379237A1Electrochemical cells with support fiber mats and manufacturing methods thereof

Publication Date: 2025.12.11 BLOOM ENERGY CORP

AI summary

An electrochemical cell includes an anode support, an anode electrode disposed on the anode support, an electrolyte layer disposed on the anode electrode, and a cathode electrode disposed on the electrolyte layer. The anode support includes a mat of ceramic support fibers and a cermet matrix including a nickel phase and a ceramic phase embedded in the mat.