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PVDF Separator Coatings

As the industry evolves to even larger and higher power cells, high performance separators are required to improve battery abuse tolerance. The Kynar Flex® LBG series features a range of PVDF grades that provide great electrode adhesion (wet & dry), high voltage stability, high dimensional stability, controlled crystallinity, and nanoceramic compatibility for both solvent and waterborne technologies.

Separator coatings - Kynar Flex® LBG series

One way to dramatically reduce the cell assemby time and lower overall production costs is to use adhesive-type separators. The LBG separator coating series demonstrates outstanding adhesion while maintaining a high degree of flexibilty. Regardless of being combined with ceramics, Kynar Flex® LBG grades allow an excellent balance between phase separation, adhesion to electrode (dry and wet), cohesion of the coating, and electrolyte uptake. With separator coatings being somewhat of an “art,” Arkema provides the most comprehensive range of polymers, allowing a broad selection of tailored solutions.

 

Kynar Flex® LBG >> the first separator coating solution

Kynar Flex® LBG 8200 >> the portfolio extension

Kynar Flex® LBG 2200 LX >> the water-borne solution

 

Extending the range:
Kynar Flex® LBG 8200

Kynar Flex® LBG 8200 effectively increases adhesion by 50% compared to the original Kynar Flex® LBG. With an increased molecular weight and subtle functionalization, Kynar Flex® LBG 8200 extends the performance range of the LBG series for separator coatings.

Kynar Flex® LBG series for separator coatings - Melting point vs. Solution viscosity in NMP

Dynamic mechanical thermal analysis of separator coatings soaked in electrolyte

Swelling correlates with the thermal-mechanical behavior of the separator coating, as seen in the graph above. The competitive separator coating evaluated essentially dissolves completely in electrolyte when exposed to 60ºC heat. Therefore, when high performance is required at elevated temperature, the Kynar Flex® LBG series is a better option.

Kynar Flex® LGB series - dynamic mechanical thermal analysis before electrolyte exposure
Kynar Flex® LGB series - dynamic mechanical thermal analysis after 24h in electrolyte
Kynar Flex® LGB series - swelling in electrolyte

Water based solutions - Kynar Flex® LBG 2200 LX (Latex)

LX technology is the most stable PVDF latex that can be shipped all over the world. With Arkema’s decades of expertise in water-borne, latex coatings (Kynar Aquatec®), our researchers now extend the LBG separator coating series to waterbased Kynar Flex® LBG 2200 LX. This new grade also has unmatched shelf-life stability with very high solids content and maintains similar performance to the original LBG grade. Arkema is committed to developing sustainable solutions and this new water-based technology for lithium ion batteries is the result of our dedication.

Kynar Flex® LBG 2200 LX - Shear stability onset thickening
PropertyNon-coated separatorAl2O3/LBGAl2O3/LBG 2200 LX
SEM image Non-coated battery separator Al2O3/LBG coated battery separator Al2O3/LBG2200LX coated battery separator
Thickness (μm) 20 25 26-28
Gurley value (sec/100cc air) 250 391.2 301.2
Resistance 1.211 1.485 1.535
Ionic conductivity 0.821 0.837 0.875
Conductance (S) 0.826 0.673 0.651

 

 
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