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Carbon Coated Foil For Lithium Ion Batteries
Carbon Coated Foil is a key enabling technology for the next generation of lithium-ion batteries. It moves beyond the traditional role of a current collector as a simple passive component and turns it into an active participant in enhancing battery performance, longevity, and safety. While it adds cost, its benefits in power, life, and compatibility with advanced materials make it indispensable for high-performance and EV-grade battery cells.
Description
Product Description
Carbon Coated Foil For Lithium ion batteries is a standard battery current collector (typically aluminum for the positive electrode, copper for the negative) that has been coated with a thin, uniform layer of a carbon-based material on one or both sides.
Think of it as giving the metal foil a "super-skin" that dramatically improves its surface properties.
Standard Foil: Metal (Al/Cu) ⟶ Active Material
Carbon Coated Foil: Metal (Al/Cu) ⟶ Carbon Layer ⟶ Active Material
Product Parameters
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Technical Parameters |
|||
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Carbon Coated Copper Foil |
Carbon Coated Aluminium Foil |
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Surface resistivity |
< 30 ohms per 25um^2 |
Double side coating |
With 1-micron thickness each side |
|
Apperance |
Double side coating with 1 micron thickness each side |
Density |
0.5 g/m2 |
|
Density |
0.54 g/m2 |
Surface Resistivity |
< 30 ohms per 25um2 |
|
Copper purity |
> 99.9% |
Binder |
Modified acrylate adhesive (water based) |
|
Copper Thickness |
9um |
The substrate of Aluminum Foil |
Purity > 99.9%Thickness: 16 micron |
|
Coating Width |
UP to 239 mm |
Package for sales |
1.0 kg/roll(Shipped in the vacuum bag) |
|
Total Width |
280 mm |
Coated width |
200mm |
|
Total Thickness |
11um |
Total Width |
260 mm cathode substrate |
|
Package for sales |
Shipped in the vacuum bag |
Total Thickness |
18 um |
Product Structure and Working Method
1,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).
Common Types of Carbon Coatings
The "carbon" isn't just one thing. Different forms offer different balances of performance and cost:
- Carbon Black (CB): The most common and cost-effective. It consists of nano-sized particles that form a porous, conductive network.
- Carbon Nanotubes (CNTs): Offer superior conductivity and mechanical strength at very low loadings. They create a "web" that interconnects active material particles. More expensive but high-performance.
- Graphene: A single layer of carbon atoms with extremely high electrical and thermal conductivity. It can form a highly efficient conductive plane.
- Graphite: Used for its lubricity and good conductivity, often in specific applications.
Many commercial coatings are a hybrid or composite of these materials.
fundamental challenges in battery manufacturing and performance.
The primary purpose is to solve several fundamental challenges in battery manufacturing and performance.
1. Dramatically Improved Adhesion
Problem: The slurry of active materials (like NMC, LFP for the cathode, or Graphite/Silicon for the anode) doesn't bond perfectly to bare metal. This can lead to delamination during cycling.
Solution: The carbon coating provides a rough, porous, and chemically compatible surface that the active material slurry can mechanically "key" into and bond with strongly. This is often the most significant benefit for manufacturers.
2. Lower Interface/Contact Resistance
Problem: There is an inherent electrical resistance at the point where the active material particles meet the smooth metal foil. This resistance impedes electron flow.
Solution: The carbon layer (typically carbon black or graphene) is highly conductive. It creates a vast, multi-point conductive network that acts as a "highway" for electrons to move between the active material and the foil, significantly reducing the internal resistance (IR) of the cell.
3. Enhanced Rate Capability and Power Performance
This is a direct result of the lower resistance. With electrons moving more freely, the battery can be charged and discharged at higher currents (high C-rates) without a significant voltage drop or capacity loss. This is critical for power tools, electric vehicles, and fast-charging applications.
4. Improved Cycle Life And Enabling Next-Generation Materials
By providing a more robust mechanical bond and a stable electrical interface, the carbon coating helps maintain the electrode's structural integrity over hundreds or thousands of charge-discharge cycles. This reduces capacity fade and extends the battery's useful life.
This is a crucial, forward-looking benefit. New high-capacity materials like Silicon (Si) or Silicon-Carbon (Si-C) composites for anodes suffer from huge volume expansion (up to 300%) during cycling. This easily breaks electrical contact with a bare copper foil, causing rapid failure.
The flexible and conductive carbon coating can accommodate this expansion and maintain electrical contact, making the use of silicon-based anodes commercially viable.
Applications
Positive Electrode (Cathode): Coated on Aluminum foil. Used with LFP (LiFePO₄), NMC (LiNiMnCoO₂), LCO (LiCoO₂), etc. LFP benefits particularly due to its lower intrinsic electronic conductivity.
- Negative Electrode (Anode): Coated on Copper foil. Critical for:
- High-Power Cells: Where low resistance is key.
- Silicon-based Anodes: As mentioned, it's almost a necessity.
- Lithium Metal Anodes: Research is ongoing to use it to suppress dendrite growth and improve cycling stability.
Test Equipments
FAQ
Q1: What info. should I let you know if i would like to get a quotation for the the Electrolytic copper foil?
A1: The material size (Thickness*Width*Length and total Qty). If possible, it would be more better to advise the application of the product
Then we can recommend the most suitable products with details for confirmation.
Q2:How long is your delivery time?
A2:Generally it is 5-10 days base on we have stock on hand. or 15-20 days if no inventory, then need check with our production team for lead time according to the quantity.
Q3: Do you provide samples ?
A3:Yes, if standard sizes sample is free but buyer need to pay freight cost.
Q4:What is your terms of payment ?
A4: Normal payment term is 30%TT, 70% before shipment get ready to ship
Q5: How do you guarantee the quality of the products?
A5: Each step of production and finished products will be carried out inspection by QC department before storing to the warehouse. NG products are not allowed in the completed goods warehouse.
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