Copper Foil for Batteries

Description

Product Overview
This high-precision electrolytic copper foil is engineered specifically for lithium-ion battery anodes, serving as the critical current collector in electric vehicle (EV) and energy storage systems (ESS). Its ultra-low surface profile and high tensile strength directly enhance energy density and cycle life, reducing internal resistance by up to 15% compared to standard foils. As global demand for high-performance batteries exceeds 3 TWh annually, this product is strategically essential for OEMs seeking to secure defect-free, scalable supply chains.

Key Specifications & Technical Characteristics

• Material Components: Double-side treated electrolytic copper (Cu ≥ 99.8%)

• Purity Grade: 99.9% minimum (ASTM B152/B793 compliant)

• Physical Characteristics:

  • Thickness: 6 µm, 8 µm, 10 µm (customizable ±0.2 µm)

  • Form: Solid roll, matte side/shiny side differentiated

  • Color: Rose-gold metallic

  • Tensile strength: ≥ 32 kgf/mm² (annealed)

  • Elongation: ≥ 4.5%

  • Surface roughness Rz: ≤ 1.2 µm (drum side)

• Packaging Options: Vacuum-sealed moisture-barrier rolls on plastic cores (3” or 6” ID), anti-static ESD packaging

• Shelf Life: 12 months in original sealed packaging at 15–30°C / ≤60% RH

Core Industrial Applications

• Primary industries: EV traction battery manufacturing, consumer electronics (smartphones, laptops), grid-scale ESS, power tool batteries

• Operational use cases: Anode current collector for graphite, silicon-dominant, or lithium-metal anodes

• Performance advantage: Superior oxidation resistance and edge tear strength reduce production scrap rates by 8–12% versus baseline foils; uniform thickness profile enables higher winding speed (up to 50 m/min) on automated slitting lines

• Commercial benefit: Enables battery cells with >180 Wh/kg energy density while maintaining >2,000 cycle stability, directly lowering lifetime cost of ownership for pack assemblers

Competitive Advantages

• Quality consistency: In-line laser pinhole detection and 100% thickness mapping (ISO 9001:2024 & IATF 16949 certified) — batch-to-batch Cpk > 1.33

• Supply reliability: Dedicated battery-grade rolling mill with 15,000 MT annual capacity and 24/7 buffer stock at three regional hubs (Asia, Europe, North America)

• Logistics capability: Pre-slit to custom widths (200–1,200 mm) with anti-telescoping cardboard cores — ready for direct unwinding on electrode coaters

• Price competitiveness: Direct mine-to-foil integration removes intermediate trader margins, offering volume discounts from 2,000 MT/year

• Sustainability: 78% recycled copper content + ISO 14001 certified production; full REACH and RoHS declaration available

• Technical support: Free pre-shipment sample rolls (3 kg) + process optimization guide for slitting, tension control, and tab welding

Commercial & Supply Information

• Minimum Order Quantity (MOQ): BULK 20MT

• Loading capacity: 22 MT per 20-ft container (standard master coils, palletized)