China Battery Aluminum Foil Suppliers and Factory in China for Lithium-Ion Batteries and Energy Storage Solutions Manufacturer, Factory

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China Battery Aluminum Foil Suppliers and Factory in China for Lithium-Ion Batteries and Energy Storage Solutions Manufacturer, Factory

Battery aluminum foil is an essential current collector material tailored specifically for lithium-ion batteries (LIBs) in China. As the carrier of the positive electrode active material, this ultra-thin foil boasts high purity, excellent conductivity, and outstanding mechanical properties. These attributes are crucial as they significantly impact the energy density, cycle life, and safety performance of lithium-ion batteries. Trusted by various suppliers, our battery aluminum foil is widely utilized in power batteries for new energy vehicles (NEVs), energy storage systems (ESS), and consumer electronics batteries. This makes it a fundamental component within the global new energy industry chain. With our factory dedicated to high-quality production, we are committed to meeting the growing demands of this vital market

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Product Description

Core Performance Characteristics

Battery aluminum foil differs from conventional aluminum foils due to its strict performance requirements tailored to battery operating conditions. Its key characteristics are as follows:

Ultra-high Purity: The aluminum content typically exceeds 99.9% (3N) and can reach up to 99.99% (4N) for high-end power batteries. High purity minimizes impurity elements (such as Fe, Si, Cu) that could cause side reactions in the battery, ensuring electrochemical stability.
Ultra-thin Thickness with Uniformity: Common thickness ranges from 4μm to 20μm, with 6μm, 8μm, and 12μm being the most widely used specifications. The thickness deviation is controlled within ±0.3μm to ensure uniform current distribution and avoid local overheating.
Excellent Conductivity: The electrical conductivity is ≥35 MS/m, which reduces the internal resistance of the battery and improves charge-discharge efficiency. High conductivity is particularly crucial for high-rate discharge scenarios like NEVs.
Superior Mechanical Properties: It has high tensile strength (≥150 MPa for 8μm foil) and good elongation (≥3%), enabling it to withstand the stress of electrode coating, rolling, and battery cycling without cracking or breaking.
Flat Surface & Strong Adhesion: The surface roughness (Ra) is controlled between 0.1μm and 0.5μm, ensuring strong adhesion with positive electrode active materials (e.g., lithium cobalt oxide, lithium iron phosphate) and preventing active material shedding during cycling.
Electrochemical Stability: It remains stable in the high-potential environment of the lithium-ion battery positive electrode (3.0–4.5V vs. Li/Li⁺) without undergoing oxidation or dissolution, ensuring long battery cycle life.

Key Manufacturing Process

The production of battery aluminum foil is a high-precision process with strict control over each step to ensure performance consistency. The main steps are as follows:

1 High-Purity Aluminum Ingot Casting: High-purity aluminum ingots (3N–4N) are melted and cast into aluminum coils through continuous casting and rolling, with strict control of impurity content during the casting process.
2 Hot Rolling: The cast aluminum coils are hot-rolled to a thickness of 2–5mm, refining the grain structure and improving mechanical properties.
3 Cold Rolling: This is the core step to achieve ultra-thin thickness. Through multiple passes of cold rolling (with intermediate annealing to eliminate work hardening), the aluminum coil is gradually thinned to the target thickness (4–20μm). The rolling speed, pressure, and annealing temperature are precisely controlled to ensure thickness uniformity.
4 Surface Treatment: A thin layer of oxide film is formed on the surface through chemical treatment or electrochemical oxidation, enhancing the adhesion with active materials and improving corrosion resistance.
5 Slitting & Cutting: The large-width aluminum foil is slit into rolls of specific widths (matching battery cell sizes) and cut into sheets of required lengths. Edge burrs are strictly controlled to avoid piercing the battery separator.
6 Quality Inspection: Key indicators such as thickness, purity, conductivity, tensile strength, surface roughness, and flatness are comprehensively inspected using precision instruments to ensure compliance with battery-grade standards.

Key Specifications

As the core positive current collector of lithium-ion batteries, battery aluminum foil is widely used in various fields driven by the rapid development of new energy industries:

New Energy Vehicles (NEVs)

The main current collector for power batteries of passenger cars, commercial vehicles, and two-wheelers. For example, 8μm–12μm aluminum foil is used in ternary lithium and lithium iron phosphate power batteries, contributing to high energy density and long cycle life.

Energy Storage Systems (ESS)

Applied in stationary energy storage (grid-connected energy storage, off-grid power supply) and portable energy storage (outdoor power stations). Its stable mechanical and electrochemical properties ensure the reliability of energy storage systems over long-term operation.

Consumer Electronics

Used in batteries for smartphones, laptops, tablets, and wearable devices. Ultra-thin aluminum foil (4μm–6μm) is adopted to reduce battery thickness and increase energy density, meeting the lightweight and miniaturization needs of consumer products.

Other Fields

Applied in special batteries such as aerospace batteries, medical equipment batteries, and power tool batteries, where high purity and stability are required.

Advantages Over Alternative Materials

In lithium-ion battery positive current collectors, battery aluminum foil has irreplaceable advantages compared to alternative materials such as copper foil and stainless steel foil:

Alternative Material	Advantages of Battery Aluminum Foil	Key Reason
Copper Foil	Lower cost (about 1/3 of copper foil), stable in high-potential environments, lighter weight	Copper foil is prone to oxidation at high potentials (positive electrode), while aluminum foil forms a stable oxide film for protection; aluminum has lower market price than copper.
Stainless Steel Foil	Better conductivity (35 MS/m vs. 15 MS/m of stainless steel), lighter weight (density 2.7g/cm³ vs. 7.9g/cm³ of stainless steel), lower internal resistance	Stainless steel has high resistivity, which increases battery internal resistance; its high density reduces battery energy density.
Titanium Foil	Much lower cost (about 1/10 of titanium foil), easier processing, and mature industrial chain	Titanium foil is expensive and difficult to produce in ultra-thin specifications, making it unsuitable for large-scale battery applications.

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Frequently Asked Questions

QWhat is battery aluminum foil and how does it differ from regular aluminum foil?

Battery aluminum foil is a high-precision current collector material specifically engineered for lithium-ion batteries. Unlike regular aluminum foil, it requires ultra-high purity (≥99.9%), ultra-thin and uniform thickness (4–20μm with ±0.3μm deviation), superior electrical conductivity (≥35 MS/m), and strict surface flatness to ensure electrochemical stability and long battery cycle life.

QWhat thickness of battery aluminum foil is most commonly used?

The most widely used thicknesses are 6μm, 8μm, and 12μm. For consumer electronics such as smartphones and laptops, ultra-thin foil (4μm–6μm) is preferred to reduce battery weight and thickness. For NEV power batteries, 8μm–12μm foil is typically used to balance energy density and mechanical strength.

QWhy is aluminum foil used as the positive current collector instead of copper foil?

Aluminum foil is preferred for the positive electrode because it forms a stable passive oxide film at high potentials (3.0–4.5V vs. Li/Li⁺), preventing oxidation and dissolution. Copper foil, in contrast, would oxidize and corrode under such high-potential conditions. Additionally, aluminum is significantly cheaper (about 1/3 the cost) and lighter than copper, making it ideal for large-scale battery production.

QWhat purity level is required for battery-grade aluminum foil?

Standard battery-grade aluminum foil requires a minimum aluminum purity of 99.9% (3N). For high-end power battery applications, such as those used in premium NEVs, the purity requirement can reach 99.99% (4N). Higher purity reduces the presence of impurity elements like Fe, Si, and Cu that could trigger unwanted side reactions within the battery.

QWhat are the main quality indicators inspected for battery aluminum foil?

Key quality indicators include: thickness and thickness uniformity (deviation within ±0.3μm), aluminum purity (≥99.9%), electrical conductivity (≥35 MS/m), tensile strength (≥150 MPa for 8μm foil), elongation (≥3%), surface roughness (Ra 0.1–0.5μm), and overall flatness. These parameters are verified using precision instruments to meet battery-grade standards.

QIn which industries and applications is battery aluminum foil used?

Battery aluminum foil is used across multiple sectors: New Energy Vehicles (NEVs) for power battery current collectors; Energy Storage Systems (ESS) for grid-connected and portable energy storage; Consumer Electronics including smartphones, laptops, tablets, and wearables; and specialized applications such as aerospace batteries, medical device batteries, and high-performance power tool batteries.

Product Detail

China Battery Aluminum Foil Suppliers and Factory in China for Lithium-Ion Batteries and Energy Storage Solutions Manufacturer, Factory

Product Description

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China Battery Aluminum Foil Suppliers and Factory in China for Lithium-Ion Batteries and Energy Storage Solutions Manufacturer, Factory

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