UV Ceramic Coated Separator Chemistry & UV System

Miltec Patented UV Ceramic Coated Separator Chemistry

Miltec UV developed a revolutionary, patented technology that gives Lithium Ion Battery (LIB) manufacturers the ability to deliver enhanced safety at a lower cost.  Our patents include a UV Curable Ceramic Coating for Separators and a UV Curable Binder for Cathodes and Anodes. Miltec’s patent on UV ceramic coating applies to all types of LIB separators.  There are also patents pending that cover ceramic coatings on anodes and cathodes. Our UV process is an energy-saving process that nearly eliminates the drying oven.  No NMP is used in any Miltec product.   The energy savings due to a shorter drying oven, smaller footprint, and higher line speeds make the UV process a significantly lower-cost alternative for separator manufacturers.

Our prototype ceramic coating unit, the CX400, coats separator at 120 meters per minute and occupies an incredibly small footprint of 3.3 x 6.6 feet (1 x 2 meters). Miltec’s unique binders are compatible with a variety of ceramic fillers and separator materials (PE, PP, Layered polyolefins, PET, and nonwovens). The binder chemistry is flexible and can be adjusted to meet precise performance specifications for many properties included high porosity and low shrinkage, up to 356°F (180°C).

The UV binder is electrochemically stable and has been tested in batteries operating at voltages up to 4.8 V.  Independent tests have shown the cycling stability of our UV chemistry is equivalent to PVDF.

Ceramic Coated Separator Advantages:

  • Improved Fire Safety by reducing shrinkage significantly even at temperatures that close the pores of the base separator film.
  • Higher voltage oxidation resistance
  • Increased battery life
  • Friendly water-based manufacturing technology
  • Compatibility with multiple ceramic fillers
  • Fast Curing (120 m/min with a Miltec UV curing lamp)
  • Ability to coat any separator film, tri-layer, PE, PP, PET, or Cellulose
  • A barrier to dendrite penetration and adds tortuosity to reduce dendrite growth
  • Prevents thermal runaway by allowing the separator to close the pores while maintaining the physical barrier between the cathode and anode
  • Improves long term cycling capacity by scavenging of cathode and electrolyte by-products from amassing on the anode and reducing the battery capacity
  • The UV Ceramic Coating Process is a significantly lower cost than oven drying methods.