Alumina (Al2O3) Ceramic Separator Coating Powder
CAS Number: 1344-28-1
Battery-grade submicron alumina (Al2O3) powder is the most widely used ceramic coating material for lithium-ion battery separators, providing thermal shutdown resistance up to 200°C+, improved wettability with carbonate electrolytes, and enhanced mechanical puncture resistance. Alpha-alumina or boehmite-derived gamma-alumina grades are available.
Technical Specifications
| D50 (μm) | 0.3–0.8 |
| Na2O (ppm) | ≤100 |
| appearance | White powder |
| purity (%) | ≥99.5 |
| moisture (%) | ≤0.5 |
| BET surface area (m²/g) | 8–15 |
Applications
- Trilayer PP/Al2O3/PE separator coating
- PE/Al2O3 double-layer separator coating
- Ceramic-coated separator for EV pouch cells
- Safety separator for high-nickel NMC cells
- Wettability-enhanced separator for fast-charging cells
Key Features
- Provides thermal dimensional stability up to 200°C, preventing separator shrinkage and internal shorts
- Improves electrolyte affinity of hydrophobic polyolefin separators for better wettability
- High mechanical strength powder protects against dendrite penetration
- Low Na2O (<100 ppm) prevents ionic contamination and capacity fade
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