Separator Coating Alumina (Al2O3 BATTERY GRADE)

Description

1. Product Overview

This product is a high-purity, battery-grade aluminum oxide (Al₂O₃) engineered specifically as a ceramic coating material for lithium-ion battery separators. Its primary industrial use is to enhance the thermal stability and wettability of polyethylene (PE) and polypropylene (PP) separator films, directly mitigating short-circuit risks from dendrite growth. The key value proposition lies in enabling safer, higher-energy-density battery cells with extended cycle life—a critical differentiator for EV and ESS battery manufacturers. Strategically, this material is indispensable as the industry transitions to nickel-rich cathodes and ultra-thin separators, where conventional polymer-only separators fail under thermal runaway conditions.

2. Key Specifications & Technical Characteristics

• Chemical Composition: Alumina (α-Al₂O₃ phase dominant, >95% alpha phase)

• Purity Level: ≥ 99.95% (battery grade, low magnetic impurities: Fe, Cu, Zn each < 10 ppm)

• Physical Characteristics:

  • Form: White, free-flowing fine powder

  • Particle Size (D50): 0.4 – 0.8 µm (adjustable by customer specification)

  • Specific Surface Area (BET): 4.0 – 7.0 m²/g

  • Tap Density: ≥ 1.0 g/cm³

  • Moisture Content: ≤ 200 ppm

• Packaging Options: 25 kg sealed HDPE drums with inner moisture-barrier liner; 500 kg FIBC bags (anti-static grade) available upon request

• Shelf Life: 24 months from manufacture date when stored unopened in dry, ambient conditions (15–30°C, <60% RH)

3. Core Industrial Applications

• Primary Industries: Lithium-ion battery manufacturing (EV, consumer electronics, grid storage), separator coating converters, and cell component suppliers.

• Specific Operational Use Cases: Applied as aqueous slurry coating (mixed with PVDF, CMC, or acrylic binders) onto one or both sides of porous polymer separators via gravure, slot-die, or micro-gravure coating lines.

• Performance Superiority: Compared to standard calcined alumina or uncoated separators, this product delivers:

  • Thermal shrinkage < 2% at 150°C for 1 hour (vs. >30% for uncoated PP separators)

  • Improved electrolyte wettability (contact angle < 30°) reducing internal resistance by 15–20%

  • Higher puncture strength (+40–60%) enabling thinner separators (down to 7 µm) without compromising safety.

• Cost Advantage: Reduced coating defects (pinholes, agglomerates) lower scrap rates in downstream cell assembly by 3–5%, delivering >10x ROI per ton used.

4. Competitive Advantages

• Quality Consistency: Lot-to-lot Cpk > 1.33 for D50, BET, and moisture; each batch undergoes ICP-OES for 12 trace metals and SEM for morphology verification.

• Supply Reliability: Dual-source production lines (Asia and EMEA) with 5,000 MT annual capacity; safety stock of 500 MT maintained at regional hubs.

• Logistics Capability: Door-to-door incoterms (CIF, DDP) with real-time trackable hazardous-class documentation (UN3077, Class 9).

• Price Competitiveness: Volume pricing benchmarked at 8–12% below top-tier Japanese equivalents while exceeding Chinese standard GB/T 34696-2017.

• Sustainability: Zero liquid discharge manufacturing; 30% recycled alumina internal loop; full REACH and RoHS declarations available.

• Technical Support: Dedicated battery applications team provides slurry formulation guidance, coating parameter optimization, and failure analysis within 48 hours.

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): BULK 20 MT per product grade (single shipment, same specification)

• Loading Capacity: 20 MT per standard 20-ft dry container (palletized, 25 kg drums)
  *Alternative loading: 22 MT per 20-ft container using FIBC bags (subject to weight compliance for road transport)*