Polypropylene (PP) Microporous Battery Separator
CAS Number: 9003-07-0
Polypropylene microporous separator is a critical safety and performance component in lithium-ion batteries, providing ionic transport through its porous structure while preventing electronic short circuits between cathode and anode. PP separators (or trilayer PP/PE/PP) are widely used in cylindrical and prismatic EV cells.
Technical Specifications
| appearance | White microporous film |
| porosity (%) | 38–50 |
| thickness (μm) | 12–25 |
| Gurley value (s/100cc) | 200–800 |
| tensile strength MD (MPa) | ≥100 |
| shutdown temperature (°C) | 155–170 |
Applications
- Cylindrical (18650/21700/4680) Li-ion cell separator
- Prismatic EV battery cell separator
- Trilayer PP/PE/PP Celgard-type separator
- Base substrate for ceramic (Al2O3/boehmite) coating
- Dry-process separator for high-volume cell manufacturing
Key Features
- Controlled pore size (30–100 nm) provides ideal balance of ionic conductivity and safety
- Thermal shutdown at 155–170°C automatically stops ion flow to prevent thermal runaway
- High tensile strength (MD ≥100 MPa) resists cell winding and handling stress
- Dry-process manufacturing produces high-purity, low-defect separator films
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