Aluminosilicate Aerogel Core-Shell Structure for High-Temperature Insulation
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Solution Overview
Problem
Silica-based aerogels suffer from rapid thermal expansion, densification, and cracking at high temperatures, which compromises their effectiveness as thermal barriers in applications like lithium-ion batteries, leading to potential thermal runaway and damage to adjacent cells.
Innovation Solution
The development of aluminosilicate aerogels with a core/shell structure and endothermic phase transformations, which provide enhanced thermal stability, reduced thermal conductivity, and resistance to physical degradation, allowing for the production of materials that can withstand temperatures up to 1300°C without cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If silica-based aerogels are used as thermal barriers, then low thermal conductivity is achieved, but thermal stability deteriorates at high temperatures due to rapid thermal expansion, densification, and cracking
Solution Approach 1:
The patent combines silica and alumina to create an aluminosilicate composite aerogel. The silica component provides low thermal conductivity while the alumina component provides thermal stability at high temperatures. This composite structure allows the material to maintain both low thermal conductivity and high thermal stability, resolving the contradiction between energy loss and reliability.
Solution Approach 2:
The patent modifies the chemical composition parameters of the aerogel by incorporating alumina into the silica matrix. This parameter change transforms the material from pure silica (which has poor high-temperature stability) to aluminosilicate (which maintains stability up to 1300°C), while preserving the low thermal conductivity property through controlled synthesis.
2Loss of energy
If silica-based aerogels are used for thermal insulation, then effective heat barrier performance is achieved, but structural integrity deteriorates at high temperatures leading to cracking and densification
Solution Approach 1:
The aluminosilicate composite structure combines the thermal insulation properties of silica with the high-temperature structural stability of alumina. The alumina framework prevents the silica structure from collapsing, densifying, or cracking at high temperatures, thereby maintaining both heat barrier performance and structural integrity simultaneously.
Solution Approach 2:
The patent creates a heterogeneous structure where alumina particles or phases are distributed within the silica matrix. The alumina-rich regions provide local structural support and resistance to thermal stress, while the silica-rich regions maintain low thermal conductivity. This local quality differentiation allows the material to exhibit both excellent insulation and structural stability.
3Weight of moving object
If pure silica aerogels are used, then low density and good insulation properties are achieved, but resistance to thermal degradation deteriorates above 600°C
Solution Approach 1:
The aluminosilicate composite maintains the low density characteristic of aerogels while incorporating alumina to provide thermal degradation resistance. The lightweight porous structure is preserved through controlled synthesis, but the incorporated alumina phases prevent catastrophic degradation above 600°C, allowing the material to maintain its insulating properties at much higher temperatures.
Solution Approach 2:
The patent changes the chemical composition parameter by adding alumina to the silica system. This compositional modification raises the decomposition temperature from below 600°C for pure silica to above 1300°C for the aluminosilicate composite, while maintaining the low density aerogel structure through optimized synthesis parameters.
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
Aluminosilicate aerogels demonstrate improved thermal resistance, maintaining structural integrity and thermal conductivity at high temperatures, effectively preventing thermal runaway and extending the lifespan of thermal barriers in high-temperature applications.
Implementation Method 1
hydrolyzing the silica precursor to produce colloidal silica
Implementation Method 2
endothermic phase transformations, which provide enhanced thermal stability
Implementation Method 3
endothermic phase transformations
Implementation Method 4
Heat transfer through aerogels is also limited by reduced convection through large specific pore volumes and very small pore sizes
Implementation Method 5
Aerogels function as insulators primarily by minimizing conduction due to low structural density results in tortuous path for energy transfer through the solid framework
Data Source
AI summary
Methods and compositions herein relate to producing an aluminosilicate aerogel. The method may include receiving a silica precursor in solvent, hydrolyzing the silica precursor to produce colloidal silica, introducing an aluminum compound to the colloidal silica to produce a colloidal aluminosilicate suspension, converting the aluminosilicate suspension to an aluminosilicate gel composition, and forming the aluminosilicate aerogel by extracting fluid.