Ceramic Coated Separator 16+4μm

Product Overview

Huizhou BestGemo New Energy’s Ceramic Coated Separator 16+4μm is a precision-engineered microporous membrane designed for lithium-ion batteries where thermal stability and mechanical integrity are critical. This specific variant features a base film thickness of 16μm with an additional 4μm ceramic coating on one side (or distributed as per design), resulting in a total thickness of 20μm. The separator is coated with aluminum oxide (Al₂O₃) ceramic particles, which create a rigid, heat-resistant inorganic layer on the base film. This inorganic 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. The thicker base film provides enhanced mechanical strength and dimensional stability, making it particularly suitable for large-format cells and applications where robust physical barrier against internal short circuits is essential.

Engineered with a controlled porosity range of 40–50%, this separator maintains an optimal balance between ionic conductivity and mechanical strength. The Al₂O₃ coating improves the separator’s wetting properties with standard carbonate electrolytes, promoting uniform ion distribution across the electrode surface. By significantly raising the thermal resistance threshold to ≥180°C and ensuring a peel strength of at least 50 N/m, this product offers a dependable foundation for battery cells that require consistent performance under both normal cycling and elevated temperature stress. The 16+4μm configuration is specifically tailored for applications where higher mechanical robustness and safety margins are prioritized, such as large-format prismatic cells or high-capacity energy storage systems.

Key Features

• 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.
• Thicker Base Film for Enhanced Safety: The 16μm base film offers increased mechanical strength and reduced thermal shrinkage, providing an extra safety margin for large-format cells and high-vibration applications.
• 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 16+4μm is specifically formulated for lithium-ion cells where operational safety and high-temperature endurance are paramount, and where a thicker separator is preferred for enhanced mechanical robustness. It is suited for both cylindrical and prismatic cell designs, as well as pouch-type cells that require a robust mechanical barrier against internal deformation. The product is particularly recommended for battery chemistries that operate with higher nominal voltages or generate more heat during rapid charge and discharge cycles, as well as for large-format cells where separator strength is critical.

• High-energy-density lithium-ion cells for electric vehicles (EVs) and hybrid electric vehicles (HEVs), especially large-format prismatic cells.
• 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 standard thickness configurations are 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.