Single and Double Sided Carbon Coated Copper Foil Lithium Battery Current Collector

Product Overview

This high-performance current collector substrate consists of premium-grade electrolytic copper foil uniformly coated with an ultra-thin, highly conductive carbon layer on either one or both sides. Developed specifically to overcome interfacial impedance and adhesion limitations in advanced electrochemical cells, the functional carbon layer establishes an intimate conductive network between the copper substrate and the active electrode mass. By providing a continuous, low-resistance electron transport bridge, the material significantly mitigates internal polarization while enhancing overall electron transfer kinetics during dynamic charge and discharge cycling.

Engineered to support next-generation battery architectures, this advanced current collector serves as an indispensable foundation for lithium-ion anodes, solid-state cell research, silicon-dominant composite electrodes, and ultra-high-rate energy storage devices. Its surface characteristics enhance wetting and mechanical interlocking with both aqueous and solvent-based binder chemistries, effectively suppressing active material delamination and electrode shedding during severe mechanical expansion and contraction. Research institutions, battery pilot lines, and industrial cell manufacturers rely on this substrate to achieve superior capacity retention and extended cycle life.

Manufactured under rigorous cleanroom quality standards, the current collector demonstrates exceptional mechanical integrity, thermal endurance, and chemical purity. A base copper purity of ≥99.95% combined with zero detectable pinholes guarantees uniform current distribution without localized thermal hotspots or corrosion vulnerability. Whether deployed in automated roll-to-roll continuous coating lines or specialized pouch and cylindrical cell prototyping workflows, this current collector delivers uncompromising batch-to-batch consistency and operational reliability under demanding cycling regimes.

Key Features

• Ultra-High Copper Substrate Purity: Built on an electrolytic copper matrix with a purity reaching ≥99.95% (specification ≥99.8%), the substrate ensures minimal internal resistance, superior electrical conductivity, and elevated resistance against chemical oxidation and electrolyte corrosion.
• Zero-Pinhole Substrate Integrity: Thoroughly inspected to guarantee zero pinholes across the entire web, preventing localized current density spikes, electrolyte bleed-through, and premature micro-short circuits during cell operation.
• Optimized Carbon Coating Density: Formulated with precision single-sided (+0.65 g/m²) and double-sided (+1.3 g/m²) carbon loading, establishing a uniform conductive interface without introducing excess inactive mass or compromising volumetric energy density.
• Superior Interfacial Mass Resistivity: Delivers an exceptionally low mass resistivity of 0.168 Ω·g/m² (specification ≤0.17 Ω·g/m²), drastically reducing interfacial contact impedance between the electrode active material and the copper base.
• Enhanced Surface Energy and Wettability: Achieves a surface tension Dyne level of 55 Dyne (specification ≥40 Dyne), promoting rapid, uniform slurry spreading and complete wetting for both aqueous and organic solvent binder systems.
• Robust Mechanical Adhesion: Passes rigorous 3M adhesive tape peel testing with zero coating loss, ensuring that the conductive carbon layer remains intact during calendering, slitting, winding, and repeated electrochemical cycling.
• High Tensile Strength and Ductility: Boasts a tensile strength of 35 kg/m² alongside a room-temperature elongation of 4.2% and high-temperature elongation of 5.5%, resisting web breakage during high-tension roll-to-roll manufacturing.
• Engineered Surface Roughness: Features a controlled surface roughness Ra of 0.7 µm (specification ≥0.4 µm), providing superior physical anchoring sites for enhanced mechanical adhesion of silicon, graphite, and composite anode slurries.
• Precision Margin and Edge Alignment: Fabricated with uniform 15 mm uncoated edge margins on both lateral sides and an edge misalignment tolerance of ≤0.1 mm, facilitating clean tab welding and automated winding operations.
• Tight Caliper Uniformity: Maintains a strict thickness tolerance within ±1 µm across the entire width and length of the roll, ensuring uniform electrode loading and flat calendered profiles.

Applications

Technical Specifications

Why Choose This Product

• Engineered Interfacial Performance: Unlike standard bare copper foils that suffer from contact resistance surges and binder micro-delamination over cycling, this material provides a continuous nano-carbon conductive interface that drastically lowers internal resistance and maintains stable electron transport throughout prolonged cycling.
• Exceptional Mechanical Reliability for High-Speed Processing: With an optimized tensile strength of 35 kg/m², tight ±1 µm thickness tolerance, and 5.5% high-temperature elongation, this current collector eliminates web tearing, edge crinkling, and foil elongation during high-speed roll-to-roll slot-die coating and high-pressure roll calendering.
• Superior Slurry Compatibility and Adhesion: A tested surface tension of 55 Dyne combined with a controlled Ra 0.7 µm roughness profile ensures rapid slurry wetting, uniform coating thickness, and strong physical-chemical anchoring of aqueous and solvent-based binders without peeling during 3M tape testing.
• Rigorous Cleanroom Quality Assurance: Every roll undergoes 100% pinhole inspection, strict chemical purity verification (≥99.95% Cu), and automated edge-tracking validation (misalignment ≤0.1 mm), ensuring seamless drop-in integration for critical pilot line and mass manufacturing operations.

Contact our technical engineering team today to discuss custom widths, single- or double-sided coating configurations, and comprehensive volume quotation options tailored to your battery research or manufacturing specifications.

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