Description
ATOMFAIR® DRY-PROCESS PP BATTERY SEPARATOR ROLLRESEARCH & PRODUCTION GRADE MATERIAL
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TAILORED SOLUTIONS FOR RESEARCH
Contact our engineering team for technical support or official quotations.
EMAIL: inquiry@atomfair.com
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Manufacturer: Atomfair LLC
Brand: ATOMFAIR®
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This dry-process polypropylene separator roll is designed exclusively for 21700 cylindrical lithium-ion battery cells, with strict dimensional and performance tolerances. The material exhibits thermal shrinkage up to 1.5% in the machine direction and 0.5% in the transverse direction at 90°C, requiring controlled-temperature storage and handling to maintain pore structure integrity.
- Thermal Sensitivity: The separator shrinks up to 1.5% MD and 0.5% TD after 2-hour exposure to 90°C, necessitating low-temperature storage and careful heat management during battery assembly.
- Mechanical Integrity: Minimum puncture strength of 450G and tensile strengths exceeding 1400 kgf/cm² (MD) and 1300 kgf/cm² (TD) are required to prevent short circuits during winding and cell operation.
- Porosity Uniformity: The nominal 42±3% porosity must be maintained across the roll to ensure consistent electrolyte wetting and ionic transport in the battery cell.
- Roll Format Handling: The separator is supplied in continuous 100m rolls 60mm wide, requiring low-tension unwinding and cleanroom conditions to avoid wrinkles and particulate contamination.
- Air Permeability Tolerance: Air permeability of 350±100 s/100ml sets limits on pore structure uniformity, directly affecting cell impedance and rate capability.
Given the puncture strength ≥450G and thermal shrinkage of ≤1.5% MD at 90°C, can this separator reliably prevent internal short circuits under mild overheating conditions?
Yes, the low thermal shrinkage (MD≤1.5%, TD≤0.5%) at 90°C ensures the separator maintains dimensional stability and prevents direct electrode contact, while the puncture strength ≥450G resists penetration from electrode burrs; together, these properties effectively mitigate short-circuit risk during moderate thermal excursions.
Is this PP separator roll suitable for use with NMC or LFP cathode chemistries in 21700 cells, or are there specific constraints?
The dry-process PP separator is chemically inert per ISO 10993 and compatible with both NMC and LFP chemistries when paired with standard LiPF6-based electrolytes; however, the air permeability of 350 s/100ml and porosity of 42% are optimized for moderate-rate applications, so high-rate LFP cells may require a separator with lower air permeability for optimal power performance.
What are the critical handling precautions when unspooling the 100m x 60mm PP separator roll to avoid wrinkle formation or electrostatic discharge?
The roll should be handled in a clean, low-humidity environment (<40% RH) to minimize electrostatic buildup, and unspooled at a controlled tension consistent with MD tensile strength of ≥1400 kgf/cm²; any excessive bending or twisting could exploit the anisotropic tensile properties (MD vs TD) and cause irreversible deformation, but within normal winding processes, the mechanical robustness ensures defect-free assembly.
This dry-process PP separator roll for 21700 cells combines high puncture strength and balanced tensile properties with low thermal shrinkage at 90°C, delivering reliable mechanical protection and dimensional stability during battery assembly and mild thermal excursions.
Positive
- High mechanical puncture and tensile strength: Puncture strength ≥450G and balanced MD/TD tensile strength (MD ≥1400, TD ≥1300 kgf/cm²) resist electrode burr penetration and winding stress, reducing internal short-circuit risk during cell assembly.
- Low thermal shrinkage at 90°C: Thermal shrinkage MD ≤1.5% and TD ≤0.5% after 2h drying at 90°C maintains separator integrity under mild overheating conditions, preventing electrode contact and enhancing battery safety.
Trade-offs
- Exclusive to 21700 cylindrical cells: This separator is only available in roll form engineered for 21700 batteries, limiting compatibility with other cell formats or sheet-based processing lines without conversion.
- Fixed roll dimensions with limited thickness options: Supplied in a single roll size (100m × 60mm) with only four thickness choices (7, 9, 12, 14 µm), which may not accommodate all winding machine specifications or custom cell designs.
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).
