Aramid-Coated PE or PP Roll as High Temperature Battery Separator, CHTBSAR

An aramid-coated separator is an advanced component used in high-performance lithium-ion and next-generation battery cells to drastically improve safety, thermal stability, and cycle life. Standard battery separators are typically made of polyolefins like polyethylene (PE) or polypropylene (PP). While cost-effective, these polymers have relatively low melting points (around 130°C to 165°C). Coating them with aramid (an aromatic polyamide, famously known by brand names like Kevlar or Nomex) transforms their physical properties. The key benefits of aramid coating on PE or PP are shown below:

Exceptional Thermal Stability: Traditional PE/PP separators shrink significantly when exposed to high temperatures, which can lead to direct contact between the anode and cathode, causing thermal runaway. Aramid coatings can withstand temperatures exceeding 200°C to 250°C without shrinking or melting. Aramid is inherently flame-resistant, providing a critical buffer during abusive thermal events.

Enhanced Mechanical Strength & Dendrite Resistance: As lithium-ion or sodium-ion batteries cycle, local irregularities can cause microscopic lithium fibers (dendrites) to grow from the anode. Aramid nano-coatings significantly increase the tensile strength and puncture resistance of the delicate base separator. This robust mechanical barrier effectively suppresses dendrite penetration, extending cell lifespan and reducing the risk of sudden internal short circuits.

Superior Electrolyte Wettability: Polyolefin separators are naturally hydrophobic and struggle to absorb polar liquid electrolytes quickly or uniformly. Aramid polymers possess polar functional groups that exhibit excellent affinity for typical battery electrolytes. Better wetting translates to faster electrolyte filling during manufacturing, more uniform current distribution, and lower interfacial resistance.

Part Number	CHTBSAR (C-HTBS-AR)
Material	Aramid resin (often mixed with inorganic ceramic particles like Al2O3 or SiO2 for added synergy) on PE or PP There are two types of aramid resin:  PPTA and PMTA
Dimension	(1) Single-Side Coating: 4um PPTA + 12um PE (W65 mm*L1 m) (2) Double-Side Coating: 2um PPTA + 12 PE + 2 um PPTA (W60 mm*L1 m)  (3) Double-Side Coating: 2um PMTA + 12 PE + 2 um PMTA (W120 mm*L1 m) (4) Double-Side Coating: 2um PMTA + 12um PP + 2um PMTA (W130 mm*L1 m) (Roll with other width, length and coating thickness can be provided upon request)
Area Density	~8.8 g/m2
Thermal Shrinking Rate (1h, 105°C)	MD: 2.5%
Peel Off Strength	17 N/m
Penetration Strength	2.0 N