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Lithium Ion Battery Current Collector Copper Foil
The primary function of copper foil within lithium batteries is to act as the negative electrode current collector. This role remains essentially unchanged in solid-state battery architectures, where copper foil continues to serve as the anode current collector. Our company has developed a range of advanced copper foil products tailored for high-performance lithium batteries, available in multiple specifications and mechanical strength grades. These include copper foil designed for medium‑to‑high tensile strength lithium‑ion battery applications, as well as mesh‑type three‑dimensional structured copper foil. These products are also well‑suited for use in solid‑state and semi‑solid battery systems.
Description
Lithium-ion Battery Current Collector Copper Foil, commonly known as battery copper foil or electrodeposited copper foil, serves as the carrier and conductive skeleton for the anode active material (e.g., graphite, silicon). Its primary functions are to collect the electrical current generated by the anode material and conduct it to the external circuit. It is a critical foundational material that significantly impacts the battery's energy density, safety, cycle life, and cost.
Lithium Ion Battery Current Collector Copper Foil is a material primarily used as the current collector of the anode in lithium ion batteries.It has ultra-thin properties and can be coated on both sides. It has the advantage of high load-carrying power and has good coating properties when is adhered. TYPE: double-shiny, double-matte,one side shiny. Normal thickness has 8 micron,9 micron, 10 micron,12 micron, 15 micron Etc. The width of the Lithium Ion Battery Current Collector Copper Foil can according to customer's request.
Manufacturing Process And Microstructure diagram
PRODUCTION PROCESS FLOW CHART
REVIEW THE COPPER FOIL VIA THE MICRO WORD
Product Parameters
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Specifications For Lithium Ion Battery Current Collector Copper Foil |
|||
|
ITEM |
both sides polished |
one side coarse |
both side coarse |
|
9μm |
12μm |
12μm |
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|
Purity |
≥99.8% |
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|
Surface density(g/m2) |
85-90 |
105-110 |
105-110 |
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Tensile strength |
≥30 |
≥25 |
≥25 |
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Extensibility |
≥5 |
≥2.5 |
≥3 |
Development Trends
Ultra-Thinning
- Current Trend: The mainstream thickness has evolved from 12μm and 10μm to 6μm and 4.5μm, and is now advancing towards 3.5μm and even 2μm.
- Advantage: Thinner foil allows for more active material to be packed into a fixed battery volume, directly increasing the battery's gravimetric and volumetric energy density.
- Challenge: Places extreme demands on the foil's strength, ductility, and production/handling technology.
High Performance
- High-Tensile Foil: Designed for stack (laminate) cell manufacturing and higher energy density batteries, preventing breakage during processing.
- Low-Profile Foil: Features a lower and more uniform surface roughness. This can improve cycle life and fast-charging capability by reducing side reactions and promoting more uniform lithium deposition.
Composite Copper Foil (PET/PP Copper Foil)
- Structure: A polymer core (e.g., PET, PP) coated on both sides with an ultra-thin copper layer (~1μm).
- Advantages: Lighter weight (potentially increasing energy density by 5-10%), better flexibility, potential cost benefits, and enhanced safety (the polymer layer can melt and act as a "fuse" during an internal short circuit).
- Challenges: Complex manufacturing (magnetron sputtering + electroplating), adhesion strength, conductivity, and welding reliability need further improvement.
Advanced Surface Treatment Technologies
Development of more efficient and environmentally friendly anti-oxidation and adhesion enhancement technologies to match next-generation anode materials like silicon-based anodes, which experience large volume expansion and place extreme demands on current collector adhesion.
Advantages
It can effectively contribute to improving the energy density of lithium batteries, provides a stable, conductive substrate onto which the anode active material slurry is coated and rolled.aligning with a major trend in the development of future power battery systems for electric vehicles-lightweighting.
It features excellent physical properties such as fine grain structure, low profile, and high elongation. In the PCB manufacturing process, it offers the advantages of short circuit etching time and highly uniform circuit etching.
With advantages including light weight, high flexibility, improved electrolyte wetting efficiency, and reduced internal resistance of lithium batteries, it significantly enhances the specific energy and charge-discharge rate of lithium-ion batteries.Copper is electrochemically stable within the operating voltage window of the anode, meaning it does not alloy with lithium.
It exhibits good thermal conductivity, excellent processability, ductility, and formability, along with remarkable resistance to softening and high fatigue strength.Collects and transports electrons generated during the battery's discharge phase to the external circuit. Conversely, it distributes electrons evenly during charging
Package
Inner Package: Blister bag/ Bubble bag/ Kraft paper/ Acrylic box or as customer's request.
Outside Package:Carton wooden box and woven bags or as customer's request.
Test equipments
Certificate
Customer Feedbacks
The rolled copper foil with soft temper used as a conductor in the apparel for cancer treatment research from our Indonesia customer.
Our ED Shielding Copper Foils with High Elongation and High Tensile Strength, can be used in many areas. We can provide the specific single-matte, double-matte, and double-shiny ED Copper for the Li-ion Battery. And we can also offer 2oz to 6oz ( nominal thickness 70um to 210um) Shielded ED Copper Foils used for shielding of electric products, especially as transformer, cable, mobile phone, computer, mechanical treatment, aerospace, and industry Applications . What is more, HTE (high temperature elongation) from 1/2oz to 2oz thickness copper foil and VLP-HTE-HF( very-low-profile, high temperature elongation, and heavy ED Copper Foils, used in PCB, which the max dimension is 1295mm x 2450mm.Below is the US customer Feedback pics for the Shielding Copper Foils used in MRI Room.
Application
Lithium Ion Battery Current Collector Copper Foil (lithium battery copper foil) is primarily used as the negative electrode current collector. Its core application areas include new energy vehicle power batteries, energy storage systems (such as grid‑scale, residential, and photovoltaic storage), and 3C digital electronic products (mobile phones, laptops, tablets, power banks, etc.).
- New energy vehicles – Serves as the negative electrode current collector in power batteries, supporting graphite‑based anode materials and conducting electrons.
- Energy storage systems – Used in lithium‑ion battery systems for electrochemical energy storage power stations, backup power supplies, and similar applications.
- Consumer electronics – Built into lithium‑ion batteries for terminal products such as mobile phones, wearable devices, and laptops.
- Other emerging fields – Includes electric tools, electric two‑wheelers, and backup power supplies for some communication equipment.
"Thinning" is a major trend in industry development
The lightweight and thinning of copper foil for lithium batteries help improve battery energy density. Copper foil can be classified by thickness into several categories: thick copper foil (>70 μm), conventional copper foil (18–70 μm), thin copper foil (12–18 μm), ultra‑thin copper foil (6–12 μm), and extremely thin copper foil (≤6 μm). For new energy vehicles, power battery energy density is a key factor determining driving range. As the demand for longer driving range continues to increase, the use of lighter and thinner copper foil makes it possible to reduce the overall battery mass while keeping the battery capacity unchanged, thereby improving gravimetric energy density. Assuming a lithium battery using 8 μm copper foil has an energy density of 220 Wh/kg, switching to 6 μm copper foil (all other conditions unchanged) can increase the energy density to 224–231 Wh/kg, representing an improvement of 2–5%. Using 4 μm copper foil can further raise the energy density to 229–240 Wh/kg, a gain of 4–9%.
Company Profile
HSMetal is a technology-driven enterprise dedicated to the design, R&D, manufacturing, and sales of advanced copper foil products. Our portfolio features a range of high-end copper foil solutions such as ultra-thin flexible lithium battery copper foil, HVLP high-frequency high-speed ultra-low profile foil, RTF reverse treated foil, ultra-thin carrier foil (peelable copper), blackened foil, buried resistance foil, and microporous copper foil.
With years of specialized experience in R&D and production of ultra-thin flexible copper foil for lithium batteries, we have built a strong track record of delivering high-performance products alongside comprehensive technical support and customized solutions to clients worldwide.
The ultra-thin electronic copper foil series developed by our company exhibits outstanding stability and reliability, making it suitable for a wide array of applications. These include multi-layer printed circuit boards (PCBs), flexible circuit boards, IC packaging substrates, 5G smartphones, servers, base stations, AI-integrated systems, automotive radar, medical devices, and aerospace technologies.
As a critical material in both the lithium battery and electronics industries, copper foil plays an essential role in enabling technological progress. We remain committed to advancing innovation through sustained R&D, continuously improving product quality, and expanding our development of lithium-ion battery materials. Our goal is to consistently provide superior customer service and contribute to the sustainable, high-quality growth of the industry.
Electrolytic Copper Foil
Microporous Copper Foil
Rolled Copper Foil
Production Line
Quality Control
R&D Capability
FAQ
Q1: What is lithium battery copper foil?
A:Lithium battery copper foil (lithium battery copper foil) is the core current collector material for lithium-ion battery negative electrodes. It is produced using methods such as electrodeposition or rolling, featuring high purity (≥99.9%), excellent conductivity, good mechanical strength, and a uniform surface.
Q2:What is the thickness trend for lithium battery copper foil?
A: "Thinning" is the main industry trend. From 12–15 μm transitioning to 8 μm, then 6 μm as mainstream, and now moving toward 4.5 μm and even thinner. Thinner copper foils directly improve battery energy density while reducing material usage.
Q3: Why is copper used instead of aluminum for the anode?
A:Copper is stable at the low voltage of the anode (around 0.1V). Aluminum would react with lithium and break apart. (Aluminum is used for the positive electrode.)
Q4:What happens if the copper foil is too thick?
A:Thicker foil adds extra weight without contributing to energy storage, which lowers the battery's energy density (less energy per kilogram).
Q5: How is battery copper foil made?
A:Most is made by electrodeposition: copper is plated from a copper sulfate solution onto a rotating titanium drum, then peeled off, treated, and slit to width.
Q6:Can copper foil be coated with something?
A:Yes. Conductive primer coated copper foil has a thin carbon layer that improves adhesion of the anode material (especially for silicon anodes) and reduces electrical resistance.
Q7: How does copper foil affect battery safety?
A:Under normal conditions, copper is safe. But if a battery is over-discharged below 2.5V, copper can dissolve into the electrolyte and then re-plate as copper dendrites, which may puncture the separator and cause a short circuit. Battery management systems prevent this by cutting off discharge at a safe voltage.
Q8: Will solid-state batteries still use copper foil?
A:Yes, most solid-state battery designs still require a copper current collector for the negative electrode. However, the interface may need special treatment (e.g., nickel coating) to be compatible with solid electrolytes.
Hot Tags: lithium ion battery current collector copper foil, China lithium ion battery current collector copper foil manufacturers
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