Ceramic Coated Separator 7+2μm

Product Overview

Huizhou BestGemo New Energy’s Ceramic Coated Separator 7+2μm is a precision-engineered microporous membrane designed for lithium-ion batteries where thermal stability and mechanical integrity are critical. The separator features a 7μm base film coated with a 2μm aluminum oxide (Al₂O₃) ceramic layer, creating a rigid, heat-resistant inorganic surface. This ultra-thin configuration is optimized for high-energy-density cell designs, offering a balanced combination of safety and performance in a compact form factor.

The ceramic coating actively enhances the separator’s ability to withstand high operating temperatures, reducing the risk of thermal runaway in demanding energy storage and power battery applications. With a controlled porosity of 40–50%, this separator maintains efficient ionic conductivity while providing robust mechanical strength. The Al₂O₃ coating improves wetting with standard carbonate electrolytes, promoting uniform ion distribution across the electrode surface. Rated for thermal resistance up to ≥180°C and a peel strength of at least 50 N/m, this 7+2μm variant delivers dependable performance for battery cells that require consistent operation under both normal cycling and elevated temperature stress.

Key Features

• Ultra-Thin Design (7+2μm): The slim profile maximizes energy density and allows for more compact cell packaging, making it ideal for applications where space and weight are critical.
• High Thermal Resistance: Rated for continuous operation at temperatures up to and exceeding 180°C, this separator resists shrinkage and maintains dimensional stability, helping to prevent internal short circuits in high-temperature environments.
• Enhanced Puncture Strength: The ceramic Al₂O₃ coating forms a hard, abrasion-resistant surface that provides superior resistance to puncture from electrode particles or lithium dendrites, reducing the likelihood of micro-shorts.
• Controlled Porosity (40–50%): Optimized pore structure allows for efficient electrolyte absorption and lithium-ion transport while providing the mechanical rigidity necessary for robust cell assembly.
• High Peel Strength (≥50 N/m): Ensures excellent adhesion of the ceramic layer to the base film, preventing delamination during slitting, stacking, or winding processes in high-speed battery manufacturing.
• Inert Inorganic Coating: The aluminum oxide ceramic layer is chemically stable and does not react with common lithium-ion electrolytes, contributing to long-term cell cycle life and consistency.

Technical Specifications

Applications

This Ceramic Coated Separator 7+2μm is specifically formulated for lithium-ion cells where high energy density and operational safety are paramount. Its ultra-thin profile makes it particularly suitable for applications that demand compact cell designs without compromising thermal endurance. The product is recommended for battery chemistries that operate with higher nominal voltages or generate more heat during rapid charge and discharge cycles.

• High-energy-density lithium-ion cells for electric vehicles (EVs) and hybrid electric vehicles (HEVs).
• Portable electronic devices such as smartphones, laptops, and wearable technology.
• Power tools and industrial equipment batteries exposed to frequent high-rate discharging.
• Specialty battery cells operating in elevated ambient temperature environments.
• Safety-critical applications such as backup power units and medical device batteries.

Quality Assurance

• Every production batch undergoes strict process control to maintain consistent thickness, porosity, and coating uniformity across the full width of the membrane.
• Each roll is subjected to a full inspection protocol before shipment, including visual checks and dimensional measurement to verify compliance with the stated specifications.
• Peel strength and thermal resistance are tested using standardized procedures to confirm that the ceramic coating remains bonded and effective under stress.
• Technical support is available to assist with product integration, and material samples can be provided for evaluation prior to bulk adoption.

OEM/ODM Customization

Huizhou BestGemo New Energy offers a range of customization options for customers with specific cell design requirements. While the 7+2μm configuration is available from stock, we can accommodate requests for tailored coating weights and custom roll widths to fit unique slitting or winding lines. Please contact our engineering team to discuss your specific electrochemical and mechanical targets; we will work with you to adjust product parameters within our manufacturing capabilities to suit your application needs.