Ceramic Coated Separator 9+3μm

Product Overview

Huizhou BestGemo New Energy’s Ceramic Coated Separator 9+3μm is a precision-engineered microporous membrane designed for lithium-ion batteries where thermal stability and mechanical integrity are critical. The separator features a 9μm base film coated with a 3μm layer of aluminum oxide (Al₂O₃) ceramic particles, creating a rigid, heat-resistant inorganic surface. This specific 9+3μm configuration offers a balanced combination of thickness and mechanical reinforcement, making it particularly suitable for high-energy-density cells that require enhanced safety margins without compromising ionic transport.

The ceramic coating actively raises the thermal resistance threshold to ≥180°C, significantly reducing the risk of thermal runaway in demanding energy storage and power battery applications. The Al₂O₃ layer also reinforces the membrane structure, providing a robust physical barrier against internal short circuits caused by electrode penetration or dendritic growth. With a controlled porosity range of 40–50%, this separator maintains an optimal balance between ionic conductivity and mechanical strength. The improved wetting properties with standard carbonate electrolytes promote uniform ion distribution across the electrode surface, ensuring consistent performance under both normal cycling and elevated temperature stress.

Key Features

• High Thermal Resistance: Rated for continuous operation at temperatures up to and exceeding 180°C, this 9+3μm 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.
• Optimized Thickness for Safety and Performance: The 9+3μm configuration provides a balanced design—thin enough for high energy density, yet thick enough to deliver enhanced thermal and mechanical protection.
• 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 9+3μm is specifically formulated for lithium-ion cells where operational safety and high-temperature endurance are paramount. The 9+3μm thickness is particularly well-suited for applications that require a balance between energy density and enhanced safety features. It is compatible with both cylindrical and prismatic cell designs, as well as pouch-type cells that demand a robust mechanical barrier against internal deformation.

• High-energy-density lithium-ion cells for electric vehicles (EVs) and hybrid electric vehicles (HEVs).
• Grid-scale and residential energy storage systems (ESS) where long-duration operation and thermal stability are required.
• 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 9+3μm 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.