Conductive primer coated copper foil is a functional material where a thin conductive primer layer is applied onto the surface of copper foil. It is primarily used as the negative electrode (anode) current collector in lithium‑ion batteries, replacing traditional bare copper foil.
This technology follows the same logic as carbon‑coated aluminum foil for the cathode: it addresses interfacial issues between the electrode active material and the metal current collector. In Li‑ion batteries, the anode uses copper foil and the cathode uses aluminum foil. The primer coating acts as an efficient "interfacial bridge," tightly connecting the copper substrate with the anode active material (e.g., graphite, silicon‑carbon).
Features of Conductive Primer Coated Copper Foil
The Adhesion force of the cathode material to the current collector and improved, especially the adhesion force of the Silicon carbon cathode is improved
Battery internal resistance and dynamic internal resistance amplification is reduced, also battery pack usage consistency is improved
Reducing polarization and improving rate capacity and low temperature performance
Protection current collectors and improving cycling performance and prolonging battery usage life
Improving yield of battery cells and reducing the cost
Technical Parameters
Conductive Primer Coated Copper Foil As Lithium Ion Battery Accessory |
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Surface resistivity |
< 30 ohms per 25um^2 |
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Apperance |
Double side coating with 1 micron thickness each side |
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Density |
0.54 g/m2 |
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Copper purity |
> 99.9% |
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Copper Thickness |
9um |
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Coating Width |
UP to 239 mm |
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Total Width |
280 mm |
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Total Thickness |
11um |
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Package for sales |
Shipped in the vacuum bag |
Product Structure and Working Method
Product Structure
The primer layer technology for carbon-coated copper foil (CCF) appears to address critical challenges in lithium-ion battery (LIB) anodes, particularly in improving interfacial contact, reducing stress from active material expansion, and protecting current collectors.
2.Working Method
Primer layer plays a critical role in enhancing the performance of carbon-coated copper foil (CCF) for lithium-ion battery(LIB) anodes. The primer acts as an interfacial bridge between the copper current collector and the anode active material (e.g., graphite, silicon).
Manufacturing Process of Conductive Primer Coated Copper Foil
Conductive Primer Coated Copper Foil is a composite material made by applying a carbon layer onto a copper foil substrate. It is widely used in high‑end electronic products. The manufacturing process consists of the following steps:
- Substrate preparation
Start with a sheet of high‑purity copper foil. The surface must be thoroughly cleaned and completely free of oil or other contaminants.
- Coating preparation
Mix a certain proportion of carbon powder with an organic binder (glue) until a uniform, paste‑like coating is formed.
- Coating application
Apply the coating evenly onto the surface of the copper foil. Then, dry the coated foil under controlled temperature and humidity conditions.
- Carbonization
Heat the copper foil together with the carbon coating at a specific temperature to allow mutual permeation between the carbon and the copper, forming a carbonized copper foil.
- Polishing
Finely polish the surface of the carbonized copper foil to improve its surface flatness and electrical conductivity.
Advantage
The application of Conductive Primer Coated Copper Foil can improve the peeling force of the positive and negative electrode sheets of lithium-ion batteries, thereby enhancing the battery cycle life, reducing the battery internal resistance, improving the battery's charging and discharging rate, and enhancing its charging and discharging ability in low-temperature environments. It can also improve the direct pass rate and assembly success rate in the battery production process, thereby significantly reducing the overall cost of battery manufacturing.
The Conductive Primer Coated Copper Foil produced by our company can be processed with high-precision coating on the thinnest 6um copper foil, and the coating surface density can be controlled between 0.02g/㎡ and 5g/㎡. That is to say, we can evenly coat a minimum of 0.02g of conductive substance on the surface of 1 square meter of copper foil, with a thickness of only 200nm. The conductive coated aluminum foil is the thinnest that can be processed with advanced coating on 10um hard high-purity aluminum foil, and the coating surface density can be controlled within 0.02g/㎡ and 5g/㎡ In other words, we can uniformly coat at least 20mg of conductive material on the surface of an aluminum foil with a thickness of only 200nm per square meter. We are currently at the forefront of this technology in the world.
The coating speed on Conductive Primer Coated Copper Foil can also reach a stable 150m/min, while the industry average speed is only 30-40m/min. At the same time, the alignment accuracy of conductive coated copper foil can still be controlled within ± 0.3mm. In terms of coating pattern design, not only can continuous full width coating be completed, but customized production can also be carried out according to customers' special requirements, which strongly supports the product design and technological progress of downstream battery enterprises. We can theoretically coat aluminum foil with any pattern, and the alignment accuracy of front and back coating can also reach ± 0.3mm, leading the entire industry.
Customer Feedback
Carbon Coated Copper Foil Feedback from Customer
We are committed to meeting the different needs of our customers. After testing different samples, Thailand customers chose carbon coated foil that is suitable for their batteries.
Tips:
Application in Customer side: Used for semi-solid systems without using any adhesive in both the anode and cathode. Electrolyte is a typical carbonate based electrolyte, just like traditional electrolytes. LFP/Pure Graphite System. Silicon free.
Our customer's using conditions: Semi-solid is just a mixture of active material (LFP or Graphite) with carbon black and electrolyte, coated on the foils. then assemble the cathode side and anode side into a cell just like normal Li-ion cell but without adding extra electrolyte. (It's already in the slurry mixing process)
Our carbon coated foil depend on their compatibility with the negative electrode system, as they have differences in improving the electrode stripping force.The specific performance differences depend on the combination of carbon coating, negative electrode, and the entire battery system.
Noramlly we need to know the specific electrode formula, Such as voltage platform, negative electrode material system (silicon carbon or graphite, etc.), negative electrode binder (SBR+CMC or PAA or PVDF). What electrolyte for a semi-solid state battery.base on above information then we can suggest suitable products
Test Equipment
Certificates
Applications
Conductive Primer Coated Copper Foil offers high electrical conductivity and excellent solderability, making it widely used in the semiconductor industry and the electronics field.
- Semiconductor industry: The manufacturing of semiconductor chips requires high‑precision etching technology.Conductive Primer Coated Copper Foil can serve as an etching layer material to achieve the high‑precision processing of semiconductor chips, ensuring their intact electrical performance.
- Electronics field: Carbon‑coated copper foil is extensively used in the production of electronic components such as mobile phone circuit boards, capacitors, and fuses. Due to its excellent conductivity, it improves device transmission speed and stability.
Company Profile
HSMetal focuses on the R&D and production of conductive and thermally conductive interface materials for new energy power battery cells, modules, and battery housings. HSMetal has invested significant human and material resources in the independent research and development of conductive materials. Our core business, the conductive series products for lithium-ion batteries, has gained widespread acceptance in the new energy and 5G fields.
We utilize primer technology to enhance electrode materials and unlock their full potential in practical applications. Our primer is an ultra-thin coating based on carbon, graphite, or carbon nanotubes, compatible with virtually any substrate. By applying this coating to electrodes, we effectively mitigate material degradation, enhancing both battery performance and safety. While pre-coating is an established method, our decade of research has refined its use to significantly boost the effectiveness of diverse battery formulations.
HSMetal's conductive coated foil is recognized as a leading solution in the global lithium-ion battery sector. We have become a strategic partner to numerous internationally renowned manufacturers of new energy vehicles and energy storage systems. The product has gained widespread market acceptance and has enabled the formation of an integrated industrial ecosystem centered around our conductive foil technology.
We are planning a development strategic growth path to create significant value in the clean energy industry.
Equipment
Carbon Coated Aluminum Foil
Carbon Coated Copper Foil
Quality Control
R&D Capability
Product Package
FAQ
Q1: What is conductive primer coated copper foil?
A:Conductive primer coated copper foil is a functional composite material made by applying a uniform layer of conductive carbon-based primer onto a high-purity electrolytic or rolled copper foil substrate. The primer layer typically consists of conductive materials such as carbon nanotubes (CNTs), graphene, conductive carbon black, conductive graphite, combined with special binders. It is primarily used as the negative electrode (anode) current collector in lithium-ion batteries.
Q2: What is the difference between "primer coated" and "carbon coated" copper foil?
A:The terms are often used interchangeably in the industry. Both refer to applying a conductive carbon-based coating onto copper foil to improve its performance as an anode current collector. Some suppliers market it as "carbon coated copper foil," while others use "primer coated copper foil" with essentially the same meaning.
Q3: Why use copper instead of aluminum for the anode?
A:Copper is the standard anode current collector because it remains stable at the very low operating potential of the anode (near 0 V). Aluminum would react with lithium to form LiAl at these low potentials, causing the foil to pulverize. Conversely, copper is stable and offers excellent electrical conductivity. (The reverse is true for the cathode, where aluminum is used and copper would oxidize.)
Q4: How does it specifically help with silicon-based anodes?
A:Silicon anodes undergo large volume expansion (up to 300%) during charge/discharge cycles, causing the active material to easily detach from the copper substrate. The conductive primer significantly improves adhesion, holding the silicon particles in place and mitigating electrode damage and capacity loss caused by uneven silicon expansion. This is why primer-coated copper foil is considered essential for next-generation high-energy-density batteries using silicon-carbon anodes.
Q5: What is the thinnest copper foil that can be coated?
A:Advanced manufacturers can apply high-precision primer coating on copper foil as thin as 6 μm (the thinnest commercially available substrate). Ultra-thin foils are critical for increasing battery energy density while reducing weight and volume.
Q6: What is the minimum coating thickness achievable?
A:Using advanced coating technology, manufacturers can achieve ultra-thin coatings with surface density as low as 0.02 g/m², corresponding to a thickness of just 200 nm (0.2 μm). Achieving such thin, uniform coatings while maintaining performance requires advanced precision coating capabilities that are currently at the industry's leading edge.
Q7: What coating speeds and precision are typical?
A:Industry-leading manufacturers can achieve coating speeds of up to 150 m/min, compared to the industry average of 30–40 m/min, while maintaining alignment precision within ±0.3 mm. This translates to significantly higher production efficiency and yields.
Q8: What is the primer layer composition?
A: The primer layer typically consists of:
- Conductive fillers: Carbon nanotubes (CNTs), graphene, conductive carbon black, conductive graphite, and potentially other nanocarbon materials. These provide high conductivity and a 3D conductive network.
- Binders: Special adhesives that ensure strong bonding to both the copper substrate and the electrode active material, while also providing flexibility and corrosion resistance.
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