Copper Foil (6µm BATTERY FOIL)

Description

1. Product Overview

This ultra-thin, high-tensile 6µm Copper Foil is a precision-engineered anode current collector specifically designed for high-energy-density lithium-ion battery cells. Its primary industrial application lies in the production of EV traction batteries, consumer electronics power cells, and advanced energy storage systems (ESS). The key value proposition is enabling higher volumetric energy density through thickness reduction while maintaining superior mechanical strength and defect-free roll consistency. Strategically, this product is critical as the global EV and battery storage transition demands thinner, stronger, and more uniform copper substrates to reduce inactive material ratios and improve cell-level Wh/kg performance.

2. Key Specifications & Technical Characteristics

• Chemical Composition / Material Components: High-purity electrolytic copper (Cu ≥ 99.9%), with trace oxygen control (low-oxygen grade, < 50 ppm) to prevent embrittlement and ensure oxidation resistance during anode coating processes.

• Purity Level / Grade: Battery-grade (Grade A); Cu purity ≥ 99.9%; surface roughness Rz ≤ 1.2 µm (single-side treated or double-side treated available).

• Physical Characteristics:

  • Thickness: 6 µm ± 0.2 µm (tolerance across web width)

  • Form: Solid rolled foil, continuous roll

  • Color: Bright metallic copper, matte side and shiny side differentiation

  • Density: 8.96 g/cm³

  • Tensile strength: ≥ 350 MPa (high-elongation variant available ≥ 3%)

  • Surface resistance: ≤ 0.05 Ω/sq

  • Pinhole count: Zero pinholes > 50 µm per 1,000 m²

• Packaging Options: Vacuum-sealed, anti-static inner core (3-inch or 6-inch ID) with moisture-barrier aluminum composite bag + desiccant; slit widths from 200 mm to 650 mm; roll length customizable up to 5,000 m per roll.

• Shelf Life: 12 months when stored in original sealed packaging at ≤ 25°C, ≤ 60% relative humidity, away from corrosive atmospheres.

3. Core Industrial Applications

• Primary Industries: Electric vehicle (EV) battery manufacturing, consumer lithium-ion battery assembly, stationary energy storage systems (ESS), and dry-cell electrode production.

• Specific Operational Use Cases:

  • Direct coating of LFP, NMC, or LMFP anode slurries onto the foil.

  • Tab welding and stacking for prismatic or pouch cells.

  • Roll-to-roll calendering and slitting in high-speed battery electrode lines.

• Why This Product Performs Better: Compared to 8 µm or 10 µm foils, this 6µm version reduces copper’s inactive mass contribution by up to 25–30%, directly increasing cell-level energy density. Versus thinner alternatives (4–5 µm), it maintains higher tensile strength and wrinkle resistance, enabling fewer web breaks during high-speed coating (up to 50 m/min).

• Efficiency / Durability / Cost Advantages: Lower copper consumption per kilowatt-hour (kWh) of battery capacity reduces material cost per cell; improved uniformity minimizes coating defects and scrap rates; enhanced elongation reduces edge cracking during slitting and notching.

4. Competitive Advantages

• Quality Consistency: Statistical process control (SPC) with 100% online pinhole detection and thickness gauge feedback loops; each roll batch reports Cpk ≥ 1.33 for thickness and tensile strength.

• Supply Reliability: Multiple upstream electrolytic copper cathode sources with 6–8 week lead-time predictability; buffer inventory of 500+ MT at regional hubs (Asia, Europe, North America).

• Logistics Capability: Export-worthy anti-tarnishing packaging validated for sea freight up to 60 days; shock-absorbent palletizing with real-time IoT humidity sensors for high-risk routes.

• Price Competitiveness: Direct mill pricing with volume-based tiering, indexed to LME copper benchmark plus fixed conversion premium.

• Sustainability: Production using > 40% recycled copper content; ISO 14001-certified facilities with water recycling > 90%; compliant with EU Battery Regulation (2023/1542) for restricted substances.

• Technical Support: Full material datasheets (TDS, SDS), OEM-specific slitting service, on-site roll evaluation, and EDS/SEM surface roughness reporting available upon request.

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): 5 metric tons (MT) per specification (thickness, width, surface treatment)

• BULK 20MT Loading Capacity: 20 MT per 20-ft standard dry container (palletized, 12 rolls per pallet, stack height optimized to avoid edge damage)