CM6721 Silicon Carbon Single-Side Coated Copper Foil

Silicon Carbon Single-Side Coated Copper Foil Description

Silicon Carbon Single-Side Coated Copper Foil is a high-performance anode material engineered for use in advanced lithium-ion batteries. It consists of a high-purity copper foil substrate coated on one side with a silicon-carbon composite layer. Silicon offers an exceptionally high theoretical specific capacity—nearly ten times that of traditional graphite anodes—but it suffers from significant volume expansion during charge/discharge cycles. To address this, silicon is combined with conductive carbon materials that form a stable, elastic matrix. This matrix buffers the expansion and contraction of silicon particles, thereby improving structural integrity and cycling stability.

The carbon component also enhances electrical conductivity and supports fast charge/discharge capability, while the copper foil ensures excellent electron transport throughout the battery cell. The single-side coating design allows for precise control of active material loading and is well-suited for layered electrode architectures.

This material is particularly valuable in applications requiring high energy density, long cycle life, and fast charging, such as electric vehicles, drones, consumer electronics, and energy storage systems. Its optimized electrochemical performance and mechanical durability make it an ideal choice for next-generation battery designs that demand improved efficiency, safety, and reliability in compact, high-power configurations.

Silicon Carbon Single-Side Coated Copper Foil Applications

1. Lithium-Ion Batteries (Anode Material): Used as a high-capacity anode in next-generation lithium-ion cells, significantly increasing energy density.

2. Electric Vehicles (EVs): Helps extend driving range and improve charging efficiency in EV battery packs.

3. Consumer Electronics: Ideal for smartphones, tablets, and laptops where compact size, long battery life, and high performance are critical.

4. Wearable Devices: Suitable for small, lightweight batteries with high energy storage and stable cycling performance.

5. Unmanned Aerial Vehicles (UAVs) and Drones: Provides high energy-to-weight ratio for long flight times and efficiency.

6. Energy Storage Systems (ESS): Enhances capacity and lifespan in grid-level and home energy storage applications.

7. Battery Research and Prototyping: Widely used in R&D for evaluating and developing advanced silicon-based anode technologies.

Silicon Carbon Single-Side Coated Copper Foil Packaging

Our products are packaged in customized cartons of various sizes based on the material dimensions. Small items are securely packed in PP boxes, while larger items are placed in custom wooden crates. We ensure strict adherence to packaging customization and the use of appropriate cushioning materials to provide optimal protection during transportation.

Packaging: Carton, Wooden Box, or Customized.

Kindly review the packaging details provided for your reference.

Manufacturing Process

1.       Testing Method

(1)    Chemical Composition Analysis - Verified using techniques such as GDMS or XRF to ensure compliance with purity requirements.

(2)    Mechanical Properties Testing - Includes tensile strength, yield strength, and elongation tests to assess material performance.

(3)    Dimensional Inspection - Measures thickness, width, and length to ensure adherence to specified tolerances.

(4)    Surface Quality Inspection - Checks for defects such as scratches, cracks, or inclusions through visual and ultrasonic examination.

(5)    Hardness Testing - Determines material hardness to confirm uniformity and mechanical reliability.

Please refer to the SAM testing procedures for detailed information.

Silicon Carbon Single-Side Coated Copper Foil FAQs

Q1. What is the main benefit of using silicon carbon coating on copper foil?

It significantly increases the lithium-ion battery’s energy density by utilizing silicon’s high capacity, while the carbon matrix improves conductivity and cycle stability.

Q2. Why is the coating only on one side?

Single-side coating allows for better control of electrode thickness and material loading, optimizing battery layer stacking and reducing internal stress.

Q3. Is this material used for the anode or cathode?

It is used as an anode material in lithium-ion batteries.

Related Information

1.       Common Preparation Methods

The preparation of Silicon Carbon Single-Side Coated Copper Foil starts with selecting high-purity copper foil, which is thoroughly cleaned to remove any surface contaminants. A silicon-carbon slurry is then prepared by mixing silicon nanoparticles with conductive carbon additives, binders such as polyvinylidene fluoride (PVDF), and solvents like N-methyl-2-pyrrolidone (NMP) to achieve a uniform dispersion. This slurry is coated onto one side of the copper foil using techniques such as doctor blade, slot-die, or roll-to-roll coating, ensuring even thickness and coverage. The coated foil is then dried in an oven to evaporate the solvents and partially cure the binder. Following drying, the foil may undergo calendaring to compress the active layer, enhance adhesion, and improve electrical contact. Finally, the coated foil is cut into the desired dimensions and subjected to quality control tests, including thickness measurement, surface uniformity, electrical conductivity, and mechanical stability, before packaging for shipment or further battery assembly. This process produces a high-quality silicon-carbon anode material with excellent electrochemical performance and mechanical durability.