Pre-oxidized silk aerogel felt coated battery cells solve the heat insulation problem of lithium battery packs
Jul 21,2025
Pre-oxidized fiber aerogel felt is an ultralight, nanoporous material composed of a polyacrylonitrile pre-oxidized fiber (pre-oxidized fiber) framework and silica aerogel composite.
1. Excellent thermal insulation performance
Low thermal conductivity: Thermal conductivity of 0.018-0.023W/(m·K) at room temperature, only 1/3 of traditional ceramic fiber felt, and ≤0.035W/(m·K) even at 800℃ high temperature.
Wide temperature range: Continuous use temperature -200℃ to 650℃, instantaneous temperature resistance up to 1000℃ (the structure remains stable after aerogel carbonization).
2. Lightweight and flexibility
Extremely low density: 150-300kg/m³, lighter and stronger than rock wool (100-200kg/m³), with high tensile strength.
Bendable construction: Bending radius ≤5 times the thickness, suitable for pipe and irregular equipment wrapping, reducing seam heat loss.
3. Flame retardancy and chemical stability
Fire rating A1, LOI≥35%, no toxic gases are released when exposed to fire.
Acid and alkali resistant (pH 2-12), hydrolysis resistant, and resistant to industrial flue gas corrosion (such as sulfuric acid dew point corrosion).
4. Uplift and compressive performance
Low noise reduction coefficient, sound absorption effect in the 125-4000Hz frequency band is better than glass wool.
Rebound rate ≥90% under 10% compression deformation, thickness loss <5% after 1000 cycles of compression.
Application fields of pre-oxidized fiber aerogel felt
1. New energy and energy storage equipment
Lithium battery pack thermal insulation: 3mm thick aerogel felt wraps the battery cells, inhibiting the spread of thermal runaway, temperature difference control <5℃ (thermal runaway test).
Liquid hydrogen storage tank insulation: Resistant to -253℃ cryogenic environment, reducing evaporation loss.
2. Industrial high-temperature equipment
Petrochemical pipeline insulation: Replacing alumina silicate fiber, reducing weight by 50% and improving construction efficiency by 3 times (no need for multi-layer wrapping).
Steel plant hot air duct: Surface temperature ≤60℃ under 650℃ operating conditions, improving energy efficiency.
3. Aerospace field
Spacecraft thermal protection system (TPS): 10mm thick felt is used for the re-entry capsule insulation layer, resistant to 1600℃ aerodynamic heating (short-term).
Warship engine room: Combines fire prevention and noise reduction functions, passing MIL-STD-1623A impact resistance test.
4. Building and transportation fields
Ultra-low energy consumption buildings: 20mm thick felt is used for exterior wall insulation, U-value ≤0.15W/(m²·K), meeting passive house standards.
New energy vehicle battery compartment: 5mm thick felt fire isolation, 70% weight reduction compared to traditional solutions, 3-5% increase in cruising range.
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