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Dry-Process Lithium-Ion Battery Separators
Celgard®
Marketing Areas
- NORTH AMERICA
At the Center of Membrane Innovation
Celgard is a global leader in the development and production of high-performance membrane technology. Celgard’s solvent-free manufacturing process results in chemically and thermally stable products that are used in a broad range of energy storage and other barrier-type applications, including lithium-ion batteries, lithium primary and select specialty battery solutions.
Celgard’s family of microporous films combine membrane functionality with the advantages of polymer technology to deliver safer and higher power performance in electric vehicle applications, as well as longer cycle life in energy storage systems.
Celgard’s family of microporous films combine membrane functionality with the advantages of polymer technology to deliver safer and higher power performance in electric vehicle applications, as well as longer cycle life in energy storage systems.
Cutting-edge Dry-process Membranes
The key to the strength of Celgard’s base film is the unique dry-process manufacturing capability. This solvent-free process consists of extrusion, lamination, annealing, stretching, and slitting and results in thermally, chemically, and physically stable membranes that are designed to match customer needs.
Celgard’s machine direction (MD) only stretched base films are uniaxially-oriented in the machine direction (MD) with high strength and practically zero transverse direction (TD) shrinkage. As a battery separator, these features significantly improve cell manufacturability and safety.
Celgard’s MD + TD stretched base films are biaxially-oriented in the machine direction (MD) and transverse direction (TD) to add other unique and patented film and pore characteristics.
Trilayer PP/PE/PP Separators
The proprietary trilayer film technology is a key feature that differentiates Celgard® battery separators from those manufactured by other suppliers. This unique process capability allows Celgard to combine the inherent benefits of polypropylene (PP) and polyethylene (PE) membranes into a single base film.
Celgard® Trilayer PP/PE/PP Separators are ideally suited for lithium-ion battery applications, offering:
Protection Against Thermal Events
●The PE inner layer in Celgard® Trilayer base films has a lower melt temperature (around 130°C) that provides high-speed shutdown capability.
●PP outer layers have a higher melting temperature (around 165°C) that provide high temperature stability.
Improved Stability at Higher Voltages
●The chemically stable PP outer layers of Celgard® Trilayer base films are designed to withstand the oxidizing effect of the cathode as well as the corrosive nature of electrolyte in different battery chemistries.
●Because of this oxidation resistance, Celgard® Trilayer separators maintain their structural integrity at high voltages – lowering the risk of internal shorting.
With additional benefits including compression resistance, z-direction strength, and low tortuosity, Celgard® Trilayer base films are one of the safest and most durable battery separator solutions for high power performance cells.
Celgard® Trilayer PP/PE/PP base films are available in thicknesses ranging from 10 to 38 microns.
Monolayer Polypropylene (PP) Separators
Chemical and dimensional stability are the most critical benefits provided by Celgard® monolayer polypropylene (PP) base films in battery separator and specialty membrane applications.
Celgard® Monolayer PP separators offer oxidation resistance and are stable across a wide thermal range – making them well-suited for applications where high temperature operation may be required but shutdown features are not needed.
Celgard® Monolayer PP separators available in thicknesses ranging from 5 to 25 microns and can also be coated and/or laminated for specialty battery applications.
LiB Separators for Electric Vehicles (EVs)
Celgard® lithium-ion battery separators deliver unique advantages for safety and optimal combinations of energy and power performance in a wide variety of EV battery cell designs. We offer a range of separator solutions that balance the competing performance demands of EV systems, including safety, chemical and dimensional stability, and cycle life. Our base film manufacturing facilities in Charlotte and Concord, North Carolina, are certified to IATF 16949:2016 – the automotive industry’s most widely used international standards for quality management.