Pre-oxidized silk aerogel felt coated battery cells solve the thermal insulation problem of lithium battery packs
May 28,2025
Core characteristics of pre-oxidized fiber aerogel felt
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.
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℃.
Wide temperature range: Continuous use temperature -200℃ to 650℃, instantaneous temperature resistance up to 1000℃ (the aerogel maintains structural stability after carbonization).
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 irregularly shaped equipment wrapping, reducing seam heat loss.
Flame retardancy and chemical stability
Fire rating A1, LOI≥35%, no toxic gases 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).
Acoustic and compressive properties
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
New energy and energy storage equipment
Lithium battery pack thermal insulation: 3mm thick aerogel felt wraps the battery cells, suppressing the spread of thermal runaway, temperature difference control <5℃ (thermal runaway test).
Liquid hydrogen tank insulation: Resistant to -253℃ cryogenic environment, reducing evaporation loss.
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.
Aerospace field
Spacecraft thermal protection system (TPS): 10mm thick felt is used in the re-entry capsule insulation layer, resistant to 1600℃ aerodynamic heating (short-term).
Ship engine room: Combines fire prevention and noise reduction functions, passing MIL-STD-1623A impact resistance test.
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 range.
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