The power density and cycle life of supercapacitors depend significantly on the interfacial condition between the current collector and electrode materials. Microporous aluminum foil current collectors greatly increase the effective surface area through micron-scale pores, improving adhesion to porous electrode materials. They are therefore one of the key components for achieving high energy density and low equivalent series resistance (ESR).
The starting point for these properties lies in the purity and microstructural uniformity of the base foil.
1070A aluminum foil is a high-purity grade within the 1xxx series industrial pure aluminum family, with an aluminum content of no less than 99.70% and total impurity content controlled below 0.30%. Compared with conventional grades such as 1235 and 1060, 1070A provides stricter control over trace impurities including iron and silicon. This enables more uniform pore formation during chemical or electrochemical etching, as well as a denser and more uniform oxide film structure.
Designed specifically for supercapacitor current collector etching processes, this product is supplied mainly in O temper, combining high elongation with a clean surface. It provides stable and reliable base material for downstream etched foil manufacturers.
Key Specifications
| Parameter | Specification |
| Material Grade | 1070A high-purity aluminum alloy, Al ≥ 99.70% |
| Temper | O, H18 |
| Thickness Range | 0.018 mm–0.035 mm, customizable |
| Common Widths | 600 mm / 650 mm / 720 mm |
| Length | 1,000–16,000 mm |
| Coil Weight | 8–20 kg per coil, customizable upon request |
| Surface Quality | Ultra-clean mirror-like surface, free from oil stains, scratches, and concentrated pinhole areas |
| Surface Treatment | Chemical etching / aluminum oxide treatment / zinc aluminate treatment, optional |
| Core Inner Diameter | 76 mm or 152 mm, optional |
| Electrical Resistivity | ≤ 0.028 Ω·mm²/m |
| Tensile Strength | ≥ 90 MPa |
| Elongation | ≥ 12% |
| Pinhole Control | ≤ 150 holes/m², superior to comparable 1060, 1050, and 1235 grades |
Key Advantages of 1070A Aluminum Foil for Supercapacitor Current Collectors
1. High Purity and Excellent Electrical Conductivity
Made from high-purity aluminum, 1070A foil features low electrical resistivity and excellent electron conductivity. It helps reduce equivalent series resistance (ESR), improve charge-discharge efficiency, and enhance power output. It is particularly suitable for high-rate and fast-response energy storage applications.
2. Uniform Thickness for Precision Coating
With tight thickness tolerance and excellent coil flatness, the foil provides a stable substrate for electrode coating. It helps reduce coating inconsistency, web deviation, and other production issues, improving manufacturing consistency and finished-product yield.
3. Clean Surface and Strong Coating Adhesion
The foil surface is flat, clean, and carefully controlled for oil residues, impurities, oxidation spots, and other defects. This improves the bonding stability of active material coatings, reduces the risk of powder shedding and delamination, and supports long-term electrode reliability.
4. Good Ductility and Processing Adaptability
1070A aluminum foil offers excellent flexibility and elongation, making it suitable for calendering, slitting, winding, punching, and stacking processes. It helps reduce the risks of foil breakage, wrinkling, and edge damage while improving continuous production efficiency.
5. Corrosion Resistance and Reliable Performance
A naturally formed dense oxide layer provides a certain degree of corrosion resistance, helping ensure stable performance during production and use. Surface condition and treatment options can be customized according to electrolyte systems, processing methods, and service environments.
6. Cost-Effective Material Solution
Combining lightweight properties, high purity, and mature processing technology, 1070A aluminum foil is a practical and high-value current collector material for supercapacitor manufacturing.
Typical Applications of 1070A Capacitor Aluminum Foil
Positive and negative electrode current collectors for electric double-layer capacitors (EDLCs)
Electrode substrates for hybrid supercapacitors and pseudocapacitors
Substrates for activated carbon slurry coating in supercapacitors
Base foil for electrochemically etched microporous aluminum foil
Energy storage capacitors used in rail transit, wind turbine pitch control systems, energy-storage UPS systems, and fast-charging construction machinery
High-power energy storage components for smart meters, IoT devices, and emergency power supplies
Quality Control for 1070A Aluminum Foil Used in Supercapacitors
To meet the application requirements of supercapacitor current collector foil, the following quality indicators are closely controlled during production and delivery:
Stable chemical composition meeting 1070A material requirements
Good thickness uniformity for continuous coating and calendering
Excellent flatness, minimizing edge waves, warping, wrinkles, and related defects
Clean surface free from obvious oil stains, dents, scratches, black spots, and foreign particles
Neat edges with controlled burrs, suitable for high-speed slitting and winding
Tight and orderly coil winding to reduce damage during transportation and unwinding
Moisture-proof, dust-proof, and impact-resistant packaging to protect product quality during delivery
Material certificates, dimensional inspection data, coil information, and other quality-related documents can be provided according to customer requirements.
FAQ
Q: What is the difference between 1070A aluminum foil and 1060 aluminum foil for supercapacitors?
A: 1070A has higher purity and lower impurity content than 1060. It offers better electrical conductivity and electrochemical stability, making it suitable for high-rate, long-cycle-life, and low-leakage-current supercapacitors. 1060 is generally more economical and is more commonly used in conventional or lower-end capacitor applications.
Q: What are the common thicknesses of 1070A aluminum foil for supercapacitors?
A: Common thicknesses include 12 μm, 15 μm, 20 μm, 25 μm, and 30 μm. The final selection depends on electrode design, coating requirements, mechanical strength, and production processes.
Q: Can 1070A aluminum foil be directly used to produce etched microporous aluminum foil?
A: Yes. This product is designed as an etching-grade base foil. Its strictly controlled impurity content and excellent pore-forming uniformity make it an ideal jumbo-roll material for microporous current collector foil production.
Q: How should I choose between O temper and H18 temper?
A: O temper is softer and more ductile, making it suitable for deep etching and pore-forming processes. H18 temper is harder and provides better dimensional stability, making it suitable for direct coating and high-speed winding applications where stretching resistance is required.
Q: Are samples available for testing?
A: Yes. Small cut samples or trial coils can be provided for coating, electrochemical, and cycle-life testing.
Q: Can MC Aluminum supply customized 1070A aluminum foil jumbo rolls?
A: Yes. MC Aluminum can customize thickness, width, coil weight, core diameter, and other specifications according to customer requirements, helping match different production equipment and processing conditions.