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Copper foil

Type: Ultra-thin copper foil, very-thin copper foil

Features: Ultra-thin series: Available in 4.5 μm and 6 μm grades to boost battery energy density. High strength and toughness: Tensile strength > 300 MPa, elongation > 5%, ensuring high processing yield of ultra-thin copper foil during coating, slitting, and winding operations. High uniformity: Thickness tolerance strictly controlled within ±2 μm, with areal density accuracy of ±1 g/m², ensuring consistency of battery electrodes. Excellent surface properties: Adopts a double-sided smooth finish with controllable surface roughness (Ra < 0.35 μm), optimizing adhesion of active materials and battery-interface stability. High chemical stability: Subjected to specialized surface passivation treatment, delivering good oxidation resistance and electrolyte corrosion resistance.

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Description

Copper foil is an essential base material for lithium-ion-battery negative electrodes. Serving both as a substrate for negative-electrode active materials and as a current collector, it directly influences battery energy density, safety, and cycle life.

Core function

Electrode current collector: Efficiently collects and conducts current generated at the negative electrode, enabling high-rate charge-discharge performance of the battery.
Active-material carrier: Provides a uniform, stable bonding substrate for negative-electrode materials such as graphite.

Classification	Thickness range	Main application scenarios	Core advantages
Ultra-thin copper foil	≤ 6 μm	High-end power batteries, high-energy-density batteries	Maximizes battery energy density
Very-thin copper foil	＞6 μm up to 12 μm	Power batteries, high-end consumer-digital batteries	Balances performance and process ability, a mainstream market choice

Copper foil

Core function

Pre-processing (Electrode Manufacturing)

Middle Section (Cell Synthesis)

Later Section (Conversion And Packaging Inspection)

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