Description
ATOMFAIR® WET-PROCESS PE SEPARATOR 20UM (75MM × 20M)RESEARCH GRADE MATERIAL
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TAILORED SOLUTIONS FOR RESEARCH
Contact our engineering team for technical support or official institutional quotations.
EMAIL: inquiry@atomfair.com
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Manufacturer: Atomfair LLC
Brand: ATOMFAIR®
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The wet-process polyethylene separator is a microporous membrane used for electrode isolation in lithium-ion battery assembly. Storage requires a sealed, dry, well-ventilated environment away from heat sources to maintain dimensional stability and prevent thermal degradation.
- Thermal Shrinkage: The separator exhibits anisotropic thermal shrinkage of 1.4% MD and 0.1% TD at elevated temperatures, requiring careful alignment during cell assembly.
- Puncture Strength: A minimum puncture strength of 722 grams ensures resistance against dendritic penetration but requires avoidance of sharp objects during handling.
- Melting Temperature: The polyethylene base film melts at 135°C, imposing a strict upper temperature limit for drying and electrolyte filling processes.
- Storage Conditions: Storage must be in a sealed, dry, and well-ventilated environment to prevent moisture absorption and oxidation.
- Handling Precautions: The separator must be handled with care to avoid severe collision, extrusion, or creasing that could compromise its mechanical integrity.
How does the 20 μm thickness of this wet-process PE separator affect its puncture strength compared to thinner alternatives?
The 20 μm thickness delivers a puncture strength of 722 g, substantially higher than thinner wet-process PE separators such as the 7 μm (339 g) and 9 μm (410 g) variants. This is achieved by combining a thicker base film with a porosity of 41% and a surface density of 11 g/m², which collectively enhance mechanical robustness while maintaining ionic conductivity.
Can this 20 μm wet-process PE separator be used directly in lithium-ion battery pouch cells originally designed for dry-process PP separators?
Direct substitution is possible but requires careful evaluation of thermal and mechanical compatibility. This PE separator melts at 135°C, which is 32°C lower than typical dry-process PP separators (167°C), potentially altering shutdown behavior. Additionally, its longitudinal thermal shrinkage of 1.4% MD and 0.1% TD must be validated against the cell's lamination and electrolyte compatibility to avoid wrinkling or short-circuit risks.
What are the specific storage and handling requirements for this wet-process PE separator to maintain its 722 g puncture strength?
Store the separator sealed in a normal or low-temperature, dry, well-ventilated environment, away from fire and heat sources. During transportation, avoid exposure to sunlight, rain, severe collision, and extrusion, as mechanical abuse can introduce micro-defects that degrade the puncture strength and overall integrity of the 20 μm film.
The Atomfair Wet-process PE Separator (AF-PE20, 20μm) offers a puncture strength of 722 g and a melting temperature of 135 °C, making it suitable for laboratory-scale battery assembly where mechanical robustness and controlled thermal shutdown are required. Its balanced porosity (41 %) and air permeability (224 s) support ion transport, while the low transverse thermal shrinkage (0.1 %) ensures dimensional stability during cell fabrication.
Positive
- High puncture strength: With a puncture strength of 722 g, this separator provides strong resistance against electrode particle penetration, reducing short-circuit risk in experimental cells.
- Low transverse thermal shrinkage: Transverse thermal shrinkage is only 0.1 %, and longitudinal shrinkage is 1.4 %, ensuring minimal dimensional change during battery assembly and thermal exposure.
Trade-offs
- Low melting temperature: The melting temperature of 135 °C is typical for PE separators and represents a trade-off between shutdown capability and thermal stability; cells must be operated well below this threshold to avoid catastrophic failure.
- Stringent storage conditions required: The product must be sealed, stored in a dry, ventilated, low‑temperature environment away from heat and fire sources, and handled with care to avoid physical damage or environmental degradation.
Every advanced material, component, equipment, and instrument in our catalog is backed by rigorous testing. We maintain strict internal quality management frameworks and align with CE conformity metrics to deliver transparent, reproducible performance data via our public open-science repository.
To request raw batch performance data, submit formal vendor registration paperwork, or execute a fast-turnaround R&D manufacturing loop, contact us at inquiry@atomfair.com.
Item is dispatched under the Atomfair Shipping & Delivery Framework (Free worldwide shipping on orders over $59 USD). Return is governed by the Atomfair Return & Refund Policy (7-day technical return window).
