The porous current collector is a new type of current collector product with a pore size of 50~100um, which is developed based on the currently commonly used ordinary current collector or carbon-coated current collector to reduce the weight of the current collector, improve the utilization rate of active materials, improve the conductivity of the electrode, reduce polarization, and increase the power density and energy density of the battery.
This current collector can solve the problem of effective migration of lithium ions to the positive electrode after the negative electrode is pre-doped with lithium. This product can effectively improve the battery's initial charge and discharge efficiency, high-rate charge and discharge capabilities, and cycle life, while making an important contribution to high-energy-density fast-charge batteries.
Chalco porous flow aluminum foil product parameters
- Alloy: 1000 series
- Appearance: Dark grey coating
- Coating thickness (double-sided)/um: usually 0.5
- Surface density (double-sided)/mg·cm-2: 0.04～0.1
- Porosity: High porosity (up to 95%)
- Void density:
| pc/cm2 | 200-800 |
| pc/cm2 | 800-1500 |
| pc/cm2 | 1500-2000 |
| pc/cm2 | 2000-3000 |
| pc/cm2 | NA |
Chalco porous current collector products
Porous current collector aluminum foil
Porous current collector aluminum foil is often used as the current collector of lithium-ion battery negative electrode materials due to its light weight, low cost and excellent corrosion resistance. It can effectively improve the energy efficiency of the battery and reduce the weight, and is suitable for applications that require lightweight design.
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| Physical Properties | Unit | Typical parameters |
| Purity | % | ≥99.95 |
| Porosity | % | 5-8, customized |
| Surface density (customized) | g/㎡ | 35-53 |
| Thickness tolerance | um | ±2.0 |
| Mass resistivity | Ω.g/㎡ | ≥0.264 |
| Tensile strength | kg/㎡ | ≥8.0 |
| RT elongation | % | ≥1.0 |
| Oxidation resistance(180℃ 15min) | OK | |
| Pore size | um | 8-12 |
Porous current collector copper foil
Porous current collector copper foil has higher electrical conductivity and stronger mechanical strength. It is often used as the current collector of lithium-ion battery positive electrode materials. It can effectively improve the battery's rate performance and charge and discharge rate, and is suitable for battery applications with high performance and high power requirements.
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| Physical property | Unit | Typical parameter |
| Purity | % | ≥99.95 |
| Porosity | um | 10~15um |
| Areal density (as per customer requirements) | g/㎡ | 130-180 |
| thickness deviation | um | ±3.0 |
| Mass electrical resistivity | Ω.g/㎡ | ≥0.168 |
| Tensile strength | kg/㎡ | ≥15.0 |
| Room temperature elongation | % | ≥2.0 |
| Resistance to oxidation(180℃15min) | OK |
Chalco porous current collector product features
- Full of interconnected, open, spherical micropores, three-dimensional network structure
- High specific surface area is achieved by using porous media.
- Made of high purity aluminum with high conductivity to ensure strength.
- Good coating properties, easy to cut
- With ultra-high conductivity, current collection and maintenance
- Good wettability with electrolyte
Chalco porous current collector product performance advantages
- Reduce current collector weight
- Improve the adhesion between active material and current collector
- Reduce interface resistance and lower battery internal resistance
- Reduce polarization, improve battery rate charge and discharge performance and active material capacity
- Reduce battery heat and improve battery safety performance
- Improving lithium-ion mobility
- Improving battery energy density
- Can significantly increase the content of negative electrode active material per unit area
- Enhance product cooling efficiency
Chalco high-end current collector product series
Current collector materials play a vital role in modern battery technology. They not only conduct electrical current in the battery, but also improve the overall performance, life and safety of the battery. Especially in the application of high-performance batteries (such as lithium batteries, electric vehicle batteries, etc.), the quality and conductivity of the current collector material directly affect the battery's charge and discharge efficiency, power density and cycle stability. Therefore, selecting the right current collector material is key to improving battery technology and ensuring long-term product reliability.
Chalco is committed to providing a range of high-performance current collector products to meet the needs of different industries. From porous current collector aluminum foil, graphene-coated aluminum foil to CA-modified aluminum foil, our products cover a variety of technologies and materials to ensure that we can provide customers with the most suitable solutions for their applications. Whether it is for high-energy density batteries or batteries that focus on long life and high safety, we can provide a wealth of options to support customers' customized needs and help them stand out in the fierce market competition.
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Ordinary current collector aluminum foil
Widely used in lithium battery negative electrodes, it is lightweight, low cost, has good conductivity and corrosion resistance, and is suitable for general battery applications.
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Carbon coated current collector aluminum foil
Coating ordinary aluminum foil with carbon material improves conductivity and stability, making it suitable for high-performance batteries.
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High specific current collector aluminum foil
It boosts active material attachment and energy density, ideal for batteries with higher capacity and long-term performance needs.
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Dry electrode
Dry coating reduces solvents and improves conductivity, making it suitable for environmentally friendly and efficient battery production.
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Graphene coated aluminum foil
Coating graphene on the surface of aluminum foil significantly improves conductivity and structural stability, making it suitable for high-rate charge and discharge applications.
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Nanographite carbon foil
By improving the conductivity and chemical stability through nanostructure, the battery life and energy density are increased, making it suitable for high-performance batteries.
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Modified current collector aluminum foil
Improve electrical conductivity and corrosion resistance through surface or material modification, suitable for high power density batteries.
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Modified current collector copper foil
Surface treatment or alloy modification improves conductivity and stability, and is suitable for positive electrode current collectors in lithium batteries.
Chalco current collector material: providing high-efficiency solutions for batteries
Lithium battery manufacturing
Current collector materials are used in the positive and negative electrode materials of lithium batteries to provide current conduction paths and improve the battery's charge and discharge efficiency and cycle stability. Common materials include aluminum foil, copper foil, graphene-coated aluminum foil, etc.
Supercapacitors
In supercapacitors, the current collector material, as part of the electrode material, plays the role of conductivity and energy storage, improving the energy density and charge and discharge rate of the supercapacitor.
Fuel cells
Current collector materials in fuel cells are typically used in the battery's electrode system to help optimize the battery's current conduction performance and improve its overall efficiency and stability.
Battery energy storage system
In large-scale battery energy storage systems, current collector materials are used to improve the charging and discharging efficiency of energy storage batteries and optimize battery performance, especially in applications in grid energy storage and renewable energy.
Electric vehicles
Electric vehicle battery systems require efficient current collector materials to enhance the battery's energy density, increase charging speed and extend service life, thereby optimizing the range and performance of electric vehicles.
Smartphones and portable electronic devices
In batteries for smartphones, tablets and other portable electronic devices, current collector materials provide greater energy efficiency, allowing devices to last longer and have fewer charging cycles.
Renewable energy storage system
Current collector materials are used in energy storage devices for renewable energy sources such as solar and wind energy to improve battery energy storage efficiency and ensure a stable supply of renewable energy.
Aerospace
In the aerospace field, current collector materials are mainly used in high-energy-density battery systems, such as battery power systems in satellites, drones, and other spacecraft.
Medical devices
Current collector materials are also used in medical devices, especially in portable medical devices, electric wheelchairs, implantable medical devices, etc., which have very high requirements on battery performance.
Chalco—leader in high-end current collector products
Production equipment and technical strength: Chalco has a large-scale high-speed coating production line for PCB lubricating aluminum foil, a modified current collector production line and a high-speed slitting machine, ensuring strong production capacity.
Quality management certification: Chalco has passed ISO 9001 and IATF 16949 quality management system certification to ensure stable and reliable product quality.
R&D center and technological innovation: Since 2013, the company has established a R&D center focusing on the research and development of modified aluminum foil and copper foil, and put into operation a modified current collector production line with an annual output of 600 tons in 2016.
Global strategic goal: Chalco is committed to becoming a global leader in high-end current collector products through technological innovation and quality services, and promoting the sustainable development of global current collector materials.
Frequently asked questions about Chalco high-end current collector products
What is the role of current collector materials in batteries?
The current collector material is one of the core components of the battery. Its main functions are:
- Conducting current: Efficiently conducts the charge in the electrode to the external circuit.
- Improve battery performance: The conductivity of the current collector directly affects the discharge efficiency and charge and discharge speed of the battery.
- Ensure battery safety: Good current collector materials can effectively reduce the internal resistance of the battery and avoid safety hazards such as overheating and fever.
- Our company's advantages: Our current collector materials not only have excellent current conductivity, but also can reduce the internal resistance of the battery, improve the overall safety and performance of the battery, and help customers build more efficient and safer battery systems.
How to choose suitable current collector material?
When selecting a suitable current collector material, the following aspects should be considered:
- Conductivity: The conductivity of the current collector material is crucial to battery efficiency. Choosing a highly conductive material can improve battery performance.
- Coating properties: For some coated current collector materials, such as graphene-coated aluminum foil, the adhesion and stability of the coating are key to ensure that it will not fall off during long-term use.
- Corrosion resistance: The battery's operating environment may affect the corrosion resistance of the current collector material. Selecting materials with excellent corrosion resistance can extend the battery life.
- Processability: The ease of processing of the current collector material is also an important factor in selection, especially during battery manufacturing and assembly.
Chalco current collector materials have excellent conductivity, corrosion resistance and easy processing. They can provide customized solutions according to customer needs to ensure that the products are suitable for different types of batteries and application scenarios.
What are the main types of current collector materials?
Common current collector materials include:
- Aluminum foil: Commonly used as the negative electrode current collector of lithium-ion batteries, it has good conductivity and stability.
- Copper foil: Mainly used for positive electrode current collector of lithium-ion batteries, it has excellent conductivity and is suitable for high-performance batteries.
- Coated aluminum foil: such as graphene-coated aluminum foil, which can significantly improve the conductivity and corrosion resistance of aluminum foil and enhance battery performance.
Chalco offers a wide range of current collector materials, including aluminum foil, copper foil, graphene-coated aluminum foil, etc., to meet the needs of different types of batteries and supercapacitors. Whether it is high conductivity, corrosion resistance or strength requirements, we can provide the most suitable solution.
How to store current collector materials?
The current collector material is usually highly hygroscopic, so the following precautions should be taken during storage:
- Vacuum packaging: Do not open the vacuum packaging before use to avoid moisture inhalation.
- Dry storage: If the package has been opened, please dry the material at 40-60℃ and store it properly at room temperature in a vacuum environment.
- Avoid humid environments: Current collector materials should be stored in a low humidity environment to prevent performance degradation.
Chalco current collector materials are vacuum packed to ensure that the product is not affected by moisture during transportation and storage, maintaining optimal performance. We also provide customers with detailed storage recommendations to ensure that the product is in optimal condition when used.
How to improve the performance of current collector materials?
In order to improve the performance of current collector materials, the following methods are usually used:
- Optimize coating technology: For example, apply advanced coating technologies such as graphene to improve the conductivity and stability of the current collector.
- Improve material purity: Use high-purity metal materials to reduce impurities, lower resistance and improve performance.
- Improve surface treatment: Improve the corrosion resistance and adhesion of the current collector through surface treatment processes such as plating and pickling.
Chalco uses advanced surface treatment and coating technologies to provide highly conductive, long-life current collector materials that can effectively improve the performance of customer products.