PVDF-HFP Separator Coating Material
PVDF-HFP (polyvinylidene fluoride-co-hexafluoropropylene) separator coating is applied onto ceramic-coated or bare polyolefin separators to improve adhesion to electrode surfaces, reduce interface resistance, and enhance electrolyte retention. It is especially important in dry-stacking pouch cell manufacturing where separator-electrode adhesion is critical.
Technical Specifications
| appearance | White powder or aqueous dispersion |
| moisture (ppm) | ≤500 |
| HFP content (mol%) | 5–15 |
| melting point (°C) | 130–155 |
| molecular weight (g/mol) | 300,000–600,000 |
| solid content (%, dispersion) | 8–15 |
Applications
- Pouch cell dry-stacking separator-electrode adhesive coating
- Ceramic-coated separator PVDF top coat
- Quasi-solid and gel electrolyte separator impregnation
- Separator coating for lithium metal batteries
- High-energy NMC pouch cell separator adhesion layer
Key Features
- PVDF-HFP copolymer provides better adhesion and electrolyte swellability than PVDF homopolymer
- Dot-coating pattern allows electrolyte penetration while maintaining separator-electrode bond
- Melting at 130–155°C contributes additional thermal shutdown function
- Aqueous dispersion grade enables eco-friendly, NMP-free separator coating process
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