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Copper foil

Type: Very thin copper foil, ultra-thin copper foil

Features: Ultra-thin Series: Offers specifications such as 4.5μm and 6μm, enhancing the energy density of the battery. High strength and toughness: Tensile strength > 300MPa, elongation > 5%, ensuring the processing yield of ultra-thin copper foil during coating, cutting and winding processes. High uniformity: Thickness tolerance is strictly controlled within ±2μm, and the unit area mass accuracy is ±1g/㎡, guaranteeing the consistency of the battery electrode sheet. Excellent surface properties: Uses double-sided smooth copper foil, with controllable surface roughness (Ra < 0.35μm), optimizing the adhesion of active substances and the stability of the battery interface. High chemical stability: Through special surface passivation treatment, it has good antioxidant and resistance to electrolyte corrosion properties.

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Description

Copper foil is a crucial basic material for the negative electrode of lithium-ion batteries. As a carrier for the negative electrode active material and an electronic collection conductor, it directly affects the energy density, safety and cycle life of the battery.

Core function

Electrode collector: Efficiently collects and conducts the current generated by the negative electrode, ensuring the high-rate charging and discharging performance of the battery.

Active material carrier: Provides a uniform and stable attachment substrate for negative electrode materials such as graphite.

Classification	Thickness range	Main application scenarios	Core advantages
Very thin copper foil	≤ 6 μm	High-end power batteries, high energy density batteries	Maximize the improvement of battery energy density and endurance
Ultra-thin copper foil	6 – 12 μm	Power batteries, high-end digital batteries	Ideal balance between performance and processing capability, a mainstream choice in the market

Copper foil

Pre-processing (Electrode Manufacturing)

Middle Section (Cell Synthesis)

Later Section (Conversion And Packaging Inspection)

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