Copper Foil (Battery Grade)
Ultra-thin electrodeposited or rolled copper foil used as the anode current collector in lithium-ion cells. Battery-grade foils demand tight thickness, roughness, tensile and purity control for high-speed coating lines.
Overview
Battery-grade copper foil (typically 4–12 µm for automotive cells, trending thinner) is produced mainly by electrodeposition (ED) from copper sulfate electrolytes, with rolled copper (RA) used in some specialty packs. The foil must combine high purity, controlled surface roughness for slurry adhesion, sufficient tensile strength and elongation for winding/stacking, and anti-oxidation treatments compatible with anode slurries. Thinner foils raise energy density but increase wrinkling, pin-hole and breakage risk on gigafactory coaters. Copper foil is one of the largest copper intensity items in an EV pack bill of materials and a strategic localisation target alongside cells. This entry is specifically battery current-collector foil, not general copper sheet or winding wire.
Automotive Applications
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Properties
Category
Type
Battery Current Collector
Available Colors
Available Forms
Key Properties
- Typical automotive thickness 4–12 µm (trending down)
- High purity electrodeposited or rolled copper
- Controlled roughness for slurry adhesion
- Tensile/elongation balance for high-speed coating
- Anti-tarnish treatments compatible with electrolytes
- Major copper intensity driver in EV packs
Technical Specifications
Density
8.96 g/cm³
Tensile Strength
Typically ~300–450 MPa for battery ED foil grades (grade-dependent)
Temperature Resistance
Melts at 1085°C; electrode drying and cell operation far below copper limits
Sustainability
Sustainability Rating
Copper is highly recyclable; foil scrap from slitting and coating is routinely remelted. Primary copper mining has significant water and energy impacts. Thinner foils reduce copper mass per kWh but raise manufacturing scrap risk if process capability is weak.