High-performance Cu Foil Rolls for LiB Manufacturing
Targray is a leading North American supplier of battery-grade copper foil – a material primarily used as the current collector of the anode in lithium-ion batteries. Starting at 4μm in thickness, our Cu foil products include electrodeposited (ED) copper foils, rolled annealed (RA) foils, high-tensile alloy (HTA) foils and roll-clad foils that combine the high conductivity of copper with aluminum, tin and silver to create unique performance benefits.
Our manufacturing partners combine strict quality management practices with novel handling technologies to ensure customers are consistently receiving the best quality foils for their battery manufacturing projects. For more information about our battery-grade copper product lines, consult the table below. For purchasing inquiries, please contact us.
Ultra Smooth Copper Foil Solutions
Advanced coating processes require extremely smooth foil surfaces for optimal deposition results. Our ultra smooth copper foil features a surface roughness below 50nm Ra on both sides. Created to deliver superior CVD (chemical vapor deposition) coating adhesion, the foil is also suitable for single- and multi-layer graphene growth. It is available in customized rolls and sheets as a substrate material.
- Cu foils made from high-purity copper with optional coating for both sides.
- Dimensions | Thickness: 006mm – 0.400mm, Width: 0.6mm – 650mm
- Rolling | Wide, ultra-thin, and compatible with various materials.
- Slitting | Narrow, thin and precise slitting.
- Surface upgrades | Degreasing, roll cladding (both sides), ultra smooth
- Formats | Coils (various core sizes), sheets, etched / stamped parts
- Offered in small lots (R&D) and large lots (mass production). Extended services available.
Electrodeposited (ED) Copper Foils
Our high-performance electrodeposited (ED) copper foils are produced via a unique manufacturing process that involves dissolving, electroplating and roll slitting. Ranging in thickness from 4μm to 12μm, our ED Cu foils are reputed for their performance characteristics including exceptional tensile strength and increased elongation.
Standard ED Copper Foils
- Standard battery-grade copper anode product line for various LiB applications.
- Cost-effective foils available in thicknesses ranging from 6μm-10μm.
- Highly reliable foil characterized by its uniform thickness and surface roughness.
- Includes a variant designed to increase elongation rate in cylindrical batteries.
High Elongation ED Copper Foils
- Battery-grade copper anode with superior tensile strength and elongation.
- Reduces the amount of wrinkling, folding and fracturing during cell manufacturing.
- Low deformation at high pressure, which allows for more active material coating to be added.
- Well-suited for the application of metal bases active materials (i.e. Si or Sn).
Ultra thin ED Copper Foils
- Exceptionally thin (5μm) battery-grade copper with high tensile strength.
- Excellent handling properties – allows for high-capacity batteries to be produced at a lower cost.
- Available in commercial quantities for large-scale lithium-ion battery manufacturing.
- Ideal for LiB applications requiring light weight and compact design. (consumer electronics, drones)
Rolled annealed (RA) Cu Foils for Lithium-ion Cell Manufacturing
Targray supplies a complete line of high-performance rolled annealed (RA) copper foil products designed specifically for lithium-ion battery applications. Products include standard, treated, and high-tensile RA copper foil sheets and rolls. Our RA foil features are summarized below.
- Excellent conductivity and copper purity in any thickness from 6μm-50μm
- Symmetrically uniform and smooth surfaces due to the rolling process
- Surface protection applied to prevent oxidation (shelf life of 6 months guaranteed)
High Tensile Alloy (HTA) Copper Foil
The growing adoption of silicon in anode materials is driving the need for stronger foils able to withstand greater stress. Our thin RA copper foil based on high-tensile alloys is designed specifically for use with with silicon-based anodes. Its increased mechanical strength and thermal stability (up to 500C) come at the expense of electrical conductivity, which is somewhat reduced.
- 50-100% higher strength than pure copper.
- Mechanical strength maintained at very high temperatures.
- Different alloys available with distinct features.
- Available as thin as 0.0008-0.020mm
- Surface Options | Solvent or electrolytically degreased.
- Ultimate tensile strength of 500 to 750 MPa.
- High thermal stability of up to 500 degrees celsius.
- Electrical conductivity between 40% and 86% IACS.
n.b. standard copper foil shows 300 to 400 MPa at 100% IACS and softens at 200 degrees celsius.
Roll-clad Copper Foils for Battery Manufacturing
A recent development in battery manufacturing is the emergence of roll-clad foils. Our roll-clad copper foils combine highly conductive copper with other metals like aluminum, tin and silver to create unique performance benefits for applications including EV and energy storage. Compared to standard plating approaches, roll cladding delivers more precise layers with tight tolerances and clean, smooth surfaces.
Aluminum clad Copper Foil (Al-Cu foil)
- Lighter weight due to the reduced specific weight of aluminum (crucial for automotive electronics, EV batteries)
- Delivers the excellent electrical and heat conductivity of copper
- Wide thickness range; Variants of 35µm or lower possible
- Can be manufactured to the desired Aluminum-Copper ratio
- Suitable for special anodes requiring the benefits of both Al and Cu
Tin Clad Copper Foil
- Highly suitable for leaded batteries and special lithium-ion battery applications
- Various tin alloys available to ensure conductivity and durability requirements are met
- Pure tin alloy options available for compliance with RoHS and REACH regulations in Europe
- Dual-side and one side tin cladding available