A1070-O Aluminum Foils for Battery: High-Purity Annealed Solutions for Energy Storage

A1070-O Aluminum Foils are premium fully annealed pure aluminum products from the 1xxx series, featuring a minimum aluminum content of 99.70%. Specifically tailored for lithium-ion battery applications-primarily as high-performance cathode current collectors-this grade leverages the inherent advantages of 1070 alloy and O-temper (fully annealed) processing to deliver exceptional ductility, industry-leading electrical conductivity, and uniform material consistency. Engineered for ultra-thin gauges (0.01mm-0.03mm) that meet the demands of high-energy-density batteries, A1070-O foils comply with stringent standards including ASTM B209, EN 573-3, and IEC 62133. Trusted by global NEV, ESS, and consumer electronics battery manufacturers, they excel in scenarios where low internal resistance, reliable slurry adhesion, and consistent batch-to-batch performance are non-negotiable.

The manufacturing of A1070-O Aluminum Foils for Battery requires meticulous control over purity, annealing processes, and dimensional accuracy to unlock optimal battery performance. We start with high-grade 1070 aluminum ingots, strictly limiting impurities-iron (≤0.25%) and silicon (≤0.10%) are kept to an absolute minimum to avoid compromising conductivity and ductility. The ingots undergo homogenization at 440-470°C to eliminate internal stress and achieve a uniform grain structure, a critical step for preventing tearing during ultra-thin cold rolling. After multi-pass precision cold rolling to target gauges, the foil undergoes full annealing at 380-420°C, which softens the material, maximizes ductility, and ensures consistent mechanical properties across the entire roll. Post-rolling and annealing, a state-of-the-art cleaning process reduces residual rolling oil to below 1.5mg/m², with optional double-sided light (DSL) finishing or conductive carbon coating to optimize compatibility with battery electrolytes and electrode slurries.

Core Performance Traits of A1070-O Aluminum Foils

A1070-O aluminum foils stand out in battery applications for their unbeatable combination of high purity, fully annealed flexibility, and electrical performance. Key attributes include:

1. Industry-Leading Electrical Conductivity

With 99.70%+ aluminum content, A1070-O foils deliver exceptional electrical conductivity (≥62% IACS)-one of the highest among commercial battery-grade aluminum foils. For cathode current collectors, this translates to ultra-low square resistance (≤0.08Ω/□ for 0.012mm gauge), minimizing internal energy loss and boosting charge-discharge efficiency. The high conductivity ensures rapid electron transfer within battery cells, supporting high-power output for NEVs and ESS systems while extending cycle life to 3000+ cycles.

2. Maximum Ductility from Full Annealing

As a fully annealed (O-temper) product, A1070-O foil offers elongation ≥25%, far exceeding work-hardened grades in formability. This exceptional flexibility enables seamless slitting, coating, and winding-even at ultra-thin 0.01mm gauge-without cracking, tearing, or edge deformation. It adapts perfectly to high-speed automated battery production lines (up to 700m/min) and complex electrode shaping, reducing material waste and ensuring uniform processing results for mass production.

3. High Purity & Chemical Stability

Strict impurity control in A1070-O foil ensures superior chemical stability in lithium-ion battery electrolytes. It resists corrosion, avoids unwanted chemical reactions, and prevents the generation of harmful byproducts that degrade battery performance. The high-purity composition also eliminates potential short-circuit risks from impurity-induced defects, making it ideal for high-energy-density batteries where safety and long-term reliability are paramount.

4. Precise Dimensional Uniformity

Advanced rolling and annealing technologies ensure tight thickness tolerance (±0.2μm for 0.01-0.02mm gauges) and transverse thickness fluctuation ≤±0.15μm (CV value <0.4%). The foil is virtually free of pinholes (≤0.5 pinholes/m²) and surface defects, with a smooth, consistent finish that guarantees uniform slurry coating and electrode performance. This dimensional precision is critical for batch-to-batch consistency in battery production.

5. Ultra-Clean Surface for Slurry Adhesion

A specialized post-processing cleaning process keeps oil residue below 1.5mg/m², with surface roughness tightly controlled between 0.12-0.25μm. The ultra-clean, smooth surface ensures strong adhesion with all common electrode slurries (LCO, LFP, NCM, NCA), preventing slurry peeling or delamination during battery cycling. It is also free of heavy metals, complying with FDA standards for indirect food contact and global environmental regulations.

Product Specifications & Technical Details

We offer fully customized A1070-O Aluminum Foils to fit diverse high-performance battery needs, with tailored gauges, surface treatments, and roll dimensions. Key specifications are as follows:

1. Technical Parameters

2. Mechanical & Physical Properties

Mechanical Properties (O Temper)

Tensile Strength: 70-85MPa

Yield Strength: 20-30MPa

Elongation (50mm): ≥25%

Hardness (HV): ≤30

Thermal & Electrical Properties

Electrical Conductivity: ≥62% IACS

Thermal Conductivity: 220 W/(m·K)

Thickness Tolerance: ±0.2μm (0.01-0.02mm)

Density: 2.70 g/cm³

Quality & Packaging

Oil Residue: <1.5mg/m²

Pinhole Count: ≤0.5/m²

Packaging: Moisture-proof film + anti-static bag + wooden pallet

Compliance: ASTM B209, IEC 62133, FDA, REACH

Key Applications of A1070-O Aluminum Foils

A1070-O aluminum foils are engineered for high-performance lithium-ion battery applications that demand maximum conductivity, flexibility, and purity. Core use cases include:

1. NEV Battery Cathode Current Collectors

A1070-O foils (0.01-0.025mm) are the preferred choice for cathode current collectors in electric vehicles (EVs, PHEVs) and hybrid electric vehicles. Their industry-leading conductivity minimizes internal resistance, supporting high-power output and longer driving ranges. The fully annealed ductility ensures seamless integration into high-speed electrode coating lines, while the ultra-clean surface enhances slurry adhesion-critical for the durability of EV battery packs under harsh operating conditions.

2. High-Energy ESS Batteries

For large-scale energy storage systems (ESS) used in grid-scale, commercial, and residential applications, A1070-O foils (0.015-0.03mm) deliver long-term reliability and consistent performance. The high purity and chemical stability ensure resistance to electrolyte degradation over decades of use, while the low internal resistance optimizes charge-discharge efficiency for energy-intensive ESS projects.

3. Premium Consumer Electronics Batteries

In premium smartphones, laptops, tablets, and wearable devices, A1070-O foils (0.012-0.02mm) enable compact, high-energy-density battery designs. The exceptional ductility allows for thin, flexible electrodes that fit into slim device form factors, while the high conductivity ensures fast charging and long battery life-key selling points for premium consumer electronics.

4. Medical Device Batteries

A1070-O foils are ideal for medical device batteries (e.g., portable monitors, insulin pumps) due to their high purity, low contamination, and reliable performance. The medical-grade cleaning process ensures no harmful residues, while the stable conductivity and long cycle life meet the strict safety and reliability requirements of medical applications.

5. Specialized High-Power Batteries

In specialized high-power batteries for drones, power tools, and industrial equipment, A1070-O foils support rapid charge-discharge cycles and high-current output. The combination of high conductivity and ductility ensures the battery can withstand the mechanical stress of frequent cycling, while the low pinhole count eliminates short-circuit risks in high-power configurations.

Handling & Fabrication Best Practices

Proper handling of A1070-O Aluminum Foils is critical to preserving their surface quality, ductility, and performance-especially for ultra-thin gauges. Follow these industry guidelines:

1. Storage & Handling

Store foils in a clean, dry environment (relative humidity ≤40%) to prevent oxidation. Use vacuum lifters or dedicated roll handlers to avoid surface scratches and deformation-never drag rolls or place heavy objects on them. Keep foils sealed in anti-static, moisture-proof packaging until use, and avoid contact with corrosive substances, dust, or sharp tools that could compromise the ultra-clean surface.

2. Unwinding & Slitting

Use precision unwinding equipment with low tension control (4-8N/m) to avoid stretching or wrinkling the soft annealed foil. For slitting, use sharp, high-precision blades and maintain burr height ≤1μm. Ensure the slitting machine is thoroughly cleaned to prevent dust contamination, and use anti-static guides to prevent foil adhesion-critical for ultra-thin gauges (≤0.015mm).

3. Coating & Processing

For electrode coating, avoid excessive pressure that could deform the soft foil. Use compatible slurries and ensure the foil surface is free of oil residues (pre-clean if necessary) to enhance adhesion. Dry coated electrodes at a moderate temperature to prevent thermal damage, and handle coated electrodes gently to avoid slurry peeling.

4. Transportation & Packaging

Transport rolls on specialized wooden pallets with side supports to prevent rolling and impact damage. Wrap rolls with multiple layers of anti-static, moisture-proof film and protective cardboard to shield against humidity and physical harm. Label rolls clearly with grade, temper, gauge, and batch number for easy identification, and avoid stacking rolls to prevent deformation of inner layers.

Our Quality Commitment & Customization Services

We understand that A1070-O Aluminum Foils are critical to your high-performance battery production-purity, consistency, and reliability are non-negotiable. Our services include:

Strict Quality Control: Every batch undergoes laser thickness testing, surface defect inspection (via high-resolution imaging), alloy composition analysis (spectroscopic testing), and conductivity measurement. We provide detailed Certificates of Analysis (COA) for each shipment, ensuring compliance with your specific requirements.

Tailored Solutions: Customize gauge (down to 0.01mm), surface treatment, and roll dimensions to match your automated production line. We support small-batch trials (minimum 200kg) to validate performance and large-volume orders (1000+ tons) for mass manufacturing.

Expert Technical Support: Our team of metallurgists and battery process engineers offers guidance on unwinding, slitting, coating, and handling to optimize efficiency and reduce waste. We help you tailor the foil's surface properties to your specific slurry and electrode design.

Global Logistics Support: We package foils for safe international transport, with optional climate-controlled shipping to prevent oxidation. Flexible shipping terms (FOB, CIF, DAP) and guaranteed on-time delivery align with your production schedule.

A1070-O Aluminum Foils for Battery set the standard for high-purity, annealed solutions in energy storage. Whether you're producing NEV batteries, ESS systems, or premium consumer electronics batteries, we deliver consistent, high-quality foils tailored to your performance needs. Contact us today to discuss your specifications, request samples, or get a personalized quote for your production requirements.