Primed Current Collector

 

The Primed Current Collector is a performance-enhancing component in modern battery manufacturing. It's not just a passive foil but an engineered part of the electrode structure that solves key challenges like adhesion and interface resistance, ultimately leading to more reliable, longer-lasting, and higher-performance lithium-ion batteries.

In a lithium-ion battery, the current collector is a thin metal foil that serves two key functions:

• Conduct Electricity: It provides a low-resistance path for electrons to flow in and out of the electrode.
• Mechanical Support: It acts as a backbone onto which the fragile, powdery active material is coated.
• Cathode (Positive Electrode): Uses Aluminum Foil. Aluminum is stable at high voltages encountered at the cathode.
• Anode (Negative Electrode): Uses Copper Foil. Copper is stable at lower voltages and does not form an alloy with lithium at the anode.

 

 

 

Technical Parameters
Carbon Coated Copper Foil		Carbon Coated Aluminium Foil
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

 

 

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.

 

The priming layer is typically:

• Thin: Much thinner than the final electrode coating.
• Consistent: Engineered to have no defects, pinholes, or agglomerations.
• Adhesive: Formulated to have excellent bonding with the bare metal foil.

 

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).

 

 

 

 

• Slurry Preparation: A slurry is made by mixing the active material (e.g., graphite), a conductive carbon additive, and a binder in a solvent.
• Priming Coating: This slurry is applied to the bare metal foil using a precise coating technique like slot-die coating.
• Drying and Calendering: The coated foil is passed through an oven to evaporate the solvent and then through heavy rollers (calenders) to compress the primer layer to the desired density and ensure good contact.
• Slitting: The large roll of primed foil is cut into narrower rolls of the required width for the battery manufacturer.

 

The battery manufacturer then uses this primed foil as the substrate for applying their main, thicker electrode coating.

 

 

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.

 

 

 

Primed current collectors are particularly valuable in advanced battery applications where performance and longevity are critical:

• High-Energy-Density Cells: For electric vehicles (EVs) and premium consumer electronics, where every bit of capacity and cycle life matters.
• Solid-State Batteries: The rigid nature of solid electrolytes can put more stress on the electrode-current collector interface, making a strong primer layer essential.
• Silicon-Anode Batteries: Silicon undergoes huge volume expansion (~300%) during charging. This creates immense stress, making a primed current collector crucial to prevent the silicon from detaching from the copper foil.

 

 

 

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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