Lithium Battery Technology

Ceramic Coated Separator (NanoPore® CCS)

Conventional lithium ion battery separators reinforced with a ceramic coating have demonstrated significant improvements to the safety, cycle life, and performance of lithium ion batteries (LIBs), leading to widespread industry adoption from smartphones to large format lithium ion batteries for electric vehicles (xEVs) and other high-energy or high-power applications. Benefits of CCS, using either a boehmite or an alumina pigmented coating, include greater thermal and chemical stability for longer cycle life, resistance to heat shrinkage, and the prevention of dendrite growth. Boehmite is a proven candidate material for ceramic coated separators with significant market share in CCS.  Optodot has entered into several licenses under its patent portfolio covering batteries, cells, electrolyte members and separators comprising boehmite.

Advantages of Boehmite CCS over Alumina

Optodot believes that boehmite has several advantages over alumina, including:

  • Lower density by 25% of boehmite compared to alumina for lower cost and lower coating weight
  • Optodot’s boehmite coating provides greater mix stability and coatability
  • Boehmite is much less abrasive than alumina (mohs hardness of 3.5 vs 9) for extended life of coating and slitting process equipment

NPORE® All-Ceramic Separators

Optodot Corporation has developed the world’s first flexible, free-standing all-ceramic nanoporous membrane separator, NPORE®, for lithium ion batteries. NPORE® separators provide superior functionality and outstanding heat resistance for current and next generation lithium ion batteries.  NPORE® separators’ features include:

Thermal Stability:

  • Best in class dimensional stability
  • 5x higher thermal conductivity vs. plastic separators
  • Flame resistant

Electrochemical Performance:

  • Superior abuse resistance
  • Rapid wet out with battery electrolytes
  • 3x greater compression resistance vs. plastic separators
  • Excellent electrolyte conductivity
  • Uniform and narrow pore size distribution

Electrode Coated Separator (NanoPore® ECS)

Optodot’s Electrode Coated Separator technology, funded by the DOE, aims to reduce the cost of manufacturing lithium ion batteries and the inactive components cost by 20-40%, while improving their safety, lifetime, and energy and power density, by incorporating new inactive components of separator, current collectors, and termination materials, and by utilizing a simpler and faster battery assembly process.

Technical Accomplishments

  • Demonstrated the first examples of current collector/electrode/separator coated stacks by leveraging off of the all-nanoporous, heat resistant, and very high compressive strength ceramic separator, the key enabling technology
  • The use of the 8 micron thick ceramic separator alone meets >20% cost improvement objective for the inactive components and also improves safety and cycle life
  • Developed new process of sintering to make metal current collection layers together with a new process for tabbing and termination

To learn more about our company, our products, and technology licensing opportunities, please contact us.