Acting as a bridge between external electronic components and internal Li-ion transport, current collectors contribute to over 90% of the electrical conductivity and approximately 90% of the mechanical strength of lithium-ion battery (LiB) electrodes. Therefore, within the broader system of aluminum materials for power batteries, choosing the right anode and cathode battery foil materials is crucial for battery manufacturers seeking to maximize battery performance.
Why choose Chalco aluminum foil for li-ion batteries?
Chalco is a leading supplier of battery grade foil materials for Li-ion energy storage technology in China. Our advanced rolling and alloy manufacturing processes enable us to supply uniform thickness, high strength aluminum foil materials to lithium-ion battery manufacturers worldwide.
Chalco aluminum foil specifications for li-ion batteries
| Category | Usage code | Alloy | Temper | Dimensions/mm | ||||
| Power storage category | Digital category | Thickness | Width | Typical inner diameter of pipe core | Outer diameter of the coil | |||
| Light foil | BP | BC | 1070 1060 1050 1235 1C30 1100 8011 8A21 | H18 | 0.008-0.020 | 0-1600.0 | 75.0 76.2 150.0 152.4 | Negotiation between supply and demand |
| Coated foil | RP | RC | ||||||
| Glossy foil: A collective term for single-sided glossy aluminum foil and double-sided glossy aluminum foil. Coated foil: Aluminum foil with a coated surface. | ||||||||
For a coated current-collector foil option, see carbon-coated aluminum foil.
Chalco aluminum foil chemical composition for li-ion batteries
| Elements | Composition% | |||||||
| 1235 | 1050 | 1060 | 1070 | 1100 | 1C30 | 8A21 | 8011 | |
| Si | 0-0.65 | 0-0.25 | 0-0.25 | 0-0.2 | 0-1.0 | 0.05-0.15 | 0-0.15 | 0.50-0.90 |
| Fe | 0-0.65 | 0-0.4 | 0-0.35 | 0-0.25 | 0-1.0 | 0.3-0.5 | 1.0-1.6 | 0.60-1 |
| Cu | 0-0.05 | 0-0.05 | 0-0.05 | 0-0.04 | 0.05-0.2 | 0.05-0.15 | 0-0.05 | 0-0.10 |
| Mn | 0-0.05 | 0-0.05 | 0-0.03 | 0-0.03 | 0-0.05 | 0-0.01 | - | 0-0.20 |
| Mg | 0-0.05 | 0-0.05 | 0-0.03 | 0-0.03 | 0-0.1 | 0-0.01 | - | 0-0.05 |
| Cr | - | - | - | - | - | - | - | 0.05 |
| Zn | 0-0.1 | 0-0.05 | 0-0.05 | 0-0.04 | 0-0.1 | 0-0.01 | - | 0-0.10 |
| Ti | 0-0.06 | 0-0.03 | 0-0.03 | 0-0.03 | 0-0.1 | 0-0.04 | 0.01-0.03 | 0-0.08 |
| V | 0-0.05 | 0-0.05 | 0-0.05 | 0-0.05 | - | - | - | - |
| Al | Remainder | Remainder | Remainder | Remainder | Remainder | Remainder | Remainder | Remainder |
Mechanical properties of Chalco aluminum foil for lithium-ion batteries
| Alloy | Temper | Thickness/mm | Room temperature tensile testing results | ||||
| Tensile strength (Rm) MPa | elongation after break (A100) % | elongation after break (A50) % | |||||
| Single side light aluminum foil | Double side light aluminum foil | Single side light aluminum foil | Double side light aluminum foil | ||||
| 1070 | H18 | ≤0.010 | ≥185 | - | ≥2.0 | - | - |
| >0.010-0.013 | |||||||
| >0.013-0.015 | ≥180 | ||||||
| >0.015-0.020 | ≥175 | ||||||
| 1060. 1050 | ≤0.010 | - | - | - | - | - | |
| >0.010-0.013 | ≥190 | ≥2.5 | ≥3.0 | ||||
| 1060, 1050 | >0.013-0.015 | ||||||
| >0.015-0.020 | ≥185 | ≥2.0 | |||||
| 1235 | ≤0.010 | - | - | - | - | - | |
| >0.010-0.013 | ≥180 | ≥2.0 | |||||
| >0.013-0.015 | ≥185 | ||||||
| >0.015-0.020 | ≥175 | ||||||
| 1C30 | ≤0.010 | ≥220 | ≥2.0 | - | - | - | |
| >0.010-0.013 | ≥230 | - | ≥2.0 | ≥2.0 | |||
| >0.013-0.015 | ≥225 | ≥2.0 | ≥2.0 | ≥2.5 | - | ||
| >0.015-0.020 | ≥220 | ≥2.5 | - | - | ≥3.0 | ||
| 1100 | ≤0.010 | ≥230 | ≥1.0 | ≥2.0 | - | ≥3.0 | |
| >0.010-0.013 | - | ||||||
| >0.013-0.015 | ≥220 | - | |||||
| >0.015-0.020 | ≥2.0 | ||||||
| 8011 | ≤0.010 | ≥180 | ≥1.0 | ≥1.5 | - | - | |
| >0.010-0.013 | - | ≥2.0 | |||||
| >0.013-0.015 | |||||||
| >0.015-0.020 | - | - | |||||
| 8A21 | ≤0.010 | ||||||
| >0.010-0.013 | |||||||
| >0.013-0.015 | ≥165 | ≥4.0 | |||||
| 8A21 | >0.015-0.020 | - | - | - | - | - | |
Dimensional deviation of Chalco aluminum foil for lithium-ion batterys
Thickness deviation
| Thickness (T) tolerance /mm | ||
| Ultra high precision level | High precision level | Normal level |
| ±3%T | ±4%T | ±5%T |
For a related thin-gauge foil product route, see ultra-thin aluminum foil.
Surface density deviation of plain and coated foil substrates
| Surface density (A) allowable deviation / g/m2 | ||
| Ultra high precision level | High precision level | Normal level |
| ±3%A | ±4%A | ±5%A |
Coating surface density deviation
| Usage code | Coating surface density / g/m2 | Allowable deviation of coating surface density / g/m2 | |
| High precision level | Normal level | ||
| RP, RC | 0.30-2.00 | 0.05 | 0.1 |
Width deviation
| Usage code | Width deviation / mm | |
| High precision level | Normal level | |
| BC, BP | ±0.5 | ±1.0 |
| RC, RP | ±0.5 | - |
Burrs on the end face of Chalco aluminum foil for lithium-ion batteries
| Edge Burr Size (not more than) | ||
| Ultra high precision level | High precision level | Normal level |
| 50μm | 100μm | 150μm |
Wave height of Chalco aluminum foil for li-ion batteries
| Usage code | Axis distance /m | Wave height (h) /mm | ||
| Ultra high precision level | High precision level | Normal level | ||
| BC, BP | 1 | ≤2.0 | ≤3.0 | ≤5.0 |
| BC, BP, RC, RP | 1.5 or 2.0 | ≤4.0 | ≤8.0 | ≤10.0 |
l – aluminum foil h – wave height
Number of pinholes in Chalco aluminum foil for lithium-ion batteries
| Thickness/mm | The number of pinholes in any 1 m² (not greater than) | ||
| Ultra high precision level | High precision level | Normal level | |
| ≤0.010 | 15 | 20 | 30 |
| >0.010-0.013 | 6 | 10 | 15 |
| >0.013-0.015 | 3 | 5 | 10 |
| >0.015-0.020 | 0 | 3 | |
Advantages of Chalco aluminum foil for li-ion batteries
Uniform and controllable thickness: Chalco aluminum foil rolling mill equipment is equipped with advanced automatic thickness control system and automatic shape control system to achieve precise control of shape and thickness.
Quality assurance: Chalco selects aluminum foil blanks, strictly controls the hydrogen content of the blanks, the amount of non-metallic slag and particle size, and guarantees product quality from raw materials.
High cleanliness: Chalco adopts advanced online degreasing technology to ensure the cleanliness of the aluminum foil on the basis of ensuring the mechanical strength of the aluminum foil.
For another surface-modified battery foil route, see modified aluminum foil for batteries.
Where is aluminum foil used in lithium-ion batteries?
The positive electrode is lithium iron phosphate coated on aluminum foil, but lithium iron phosphate is preferred. The negative electrode is copper foil coated with graphite or lithium titanate. There is a separator between the positive and negative foils, which are wound together. Put the wound positive and negative sheets (including the separator) into the battery case together, inject the electrolyte, and then vacuum seal to complete the processing of a single battery.
For applications beyond batteries, see the broader uses of aluminum foil.
Product classification and application of Chalco aluminum foil for lithium-ion batteries
Battery aluminum foil can be classified by cell type, material function and surface treatment. The main categories include current-collector foil for power, consumer and energy-storage batteries, as well as aluminum foil used in pouch-cell packaging. For a broader overview of foil types and their characteristics, refer to our aluminum foil classification guide.
Power lithium-ion battery foil: This foil is primarily used as the positive-electrode current collector in batteries for EVs and HEVs. It requires controlled thickness, high conductivity, good mechanical strength and stable surface quality to support electrode coating and battery performance. In pouch-type power batteries, 8021 aluminum foil for pouch battery packaging can also be used as the middle barrier layer of the aluminum-plastic laminate film. These materials form an important part of broader automotive aluminum applications.
Consumer battery foil: Consumer lithium-ion battery foil is widely used in smartphones, laptops, wearable devices, portable electronics and electric personal mobility products. These applications generally require thin, lightweight and consistent foil materials that support compact cell designs, reliable electrode processing and high energy density.
Energy storage battery foil: Energy storage lithium-ion battery foil is used in residential, commercial and utility-scale storage systems, renewable-energy installations and industrial power systems. Stable material performance and batch consistency help support long service life, reliable charge-discharge performance and efficient energy management.
How to choose high quality battery aluminum foil?
Quality requirements
- The surface of the aluminum foil is uniform in color, clean, and flat, without obvious roll marks, pitting, pinholes, and corrosion marks.
- There are no rolling defects such as creases, mottling, bright lines, etc. on the surface of the aluminum foil.
- There is no color difference on the surface of the aluminum foil.
- No oil on the surface, no serious oil odor, and no visible oil spots.
- Surface tension, dyne pen test is not less than 32 dyne.
Appearance requirements
- The aluminum foil coil is wound tightly, the end surface is flat and clean, and the edge is smooth.
- The staggered layer of aluminum foil shall not exceed ±1.0mm.
- The width of the aluminum foil roll tube core is greater than or equal to the foil width, and generally the length of the two ends of the tube core does not exceed the foil width of 5mm.
- The aluminum foil should be wrapped around the center of the tube core.
- The joint part has clear joint marks on the two ends of the aluminum coil.
Related Aluminum Foil & EV Battery Aluminum Products
Aluminum Foil
8011 Aluminum Foil
1235 Aluminum Foil
Aluminum for Power Battery Shells
Aluminum for Battery Liquid Cooling Plates
Aluminum for EV Battery Trays
FAQ
Q1: Are you factory or trading company?
A1: Industry and trading company.
Q2: Wonder if you accept small orders?
A2: Do not worry. Feel free to contact us .in order to get more orders and give our clients more convener, we accept small order.
Q3: Can you send products to my country?
A3: Sure, we can. If you do not have your own ship forwarder, we can help you.
Q4: When can I get the quotation?
A4: We usually quote you within 24 hours after we get your inquiry. If you are very
urgent to get the quotation. Please call us or tell us in your mail, so that we could
regard your inquiry priority.
Q5: Do you have after sale service?
A5: Yes. Any quality problem occurs within one year, pls take photos, we will be responsible.
Q6: How do you guarantee the quality of the product?
A6: Aluminum imports Achenbach Buschhutten wide rolling mill, OPTIFOILR slitting machine and coiler. With those advanced equipment and technology, we can ensure best product for you.
