CM6722 Silicon Carbon Double-Side Coated Copper Foil

Double-sided Coated Copper Foil with Silicon Carbon Description

The double-sided copper foil coated with silicon carbon is an advanced anode material designed to meet the increasing demands for higher energy density and longer cycle life in lithium-ion batteries. This material consists of a high-purity copper foil that is coated on both sides with a carefully formulated silicon-carbon composite layer. Silicon is known for its exceptional lithium storage capacity; however, it undergoes significant volume changes during the charging and discharging process, which can lead to mechanical stresses and reduce battery lifespan. To mitigate this, silicon particles are embedded in a conductive carbon matrix that buffers these volume fluctuations and maintains structural integrity.

The double-sided coating allows for a higher loading of active material compared to single-sided coatings, effectively doubling the silicon capacity per unit area while simultaneously maintaining balanced electrical conductivity across the entire electrode. The carbon matrix enhances electron transport and reduces internal resistance, thereby supporting rapid charging and discharging processes. The copper foil acts as a sturdy and highly conductive current collector, ensuring efficient electron flow and mechanical support.

This silicon-carbon composite electrode is ideal for high-performance applications such as electric vehicles, portable consumer electronics, drones, and energy storage systems, where maximising energy density, maintaining stable cycles, and improving safety are crucial. The double-sided coating also enables more compact battery architectures, contributing to lighter, smaller, and more efficient battery packs suitable for next-generation energy solutions.

Applications of Double-sided Coated Silicon Carbon Copper Foils

1. Anodes for lithium-ion batteries: Provides high-capacity, durable anode material for modern lithium-ion cells.

2. Electric Vehicles (EVs): Enhances the range and fast charging of EV battery packs by increasing energy density and lifespan.

3. Consumer Electronics: Used in smartphones, tablets, and laptops that require compact, high-performance batteries.

4. Drones and UAVs: Provides lightweight, high-energy anodes for longer flight times and improved efficiency.

5. Energy Storage Systems (ESS): Supports large-scale and residential energy storage with improved capacity and reliability.

6. Portable Devices: Suitable for small, flexible batteries that require stable cycles and high energy.

7. Battery Research and Development: Commonly used in research and development to develop and test next-generation silicon-based anode technologies.

Packaging of Silicon Carbon with Double-sided Copper Foil

Our products are packaged in custom cartons of various sizes based on the material dimensions. Smaller items are securely packaged in PP cartons, while larger items are placed in custom wooden crates. We ensure strict compliance with packaging specifications and the use of appropriate cushioning materials to provide optimal protection during transport.

Packaging: Carton, wooden crate, or custom-made.

Please refer to the packaging details for your information.

Manufacturing Process

1) Testing Procedures

(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 testing - Measures thickness, width, and length to ensure compliance with specified tolerances.

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

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

Detailed information can be found in our SAM Testing Procedures.

Frequently Asked Questions about Double-sided Coated Silicon Carbon Copper Foil

Q1. What are the advantages of double-sided coating over single-sided?

The double-sided coating doubles the active material loading per unit area, increases energy density, and maintains balanced electrical conductivity.

Q2. How does the silicon-carbon composite improve battery performance?

Silicon offers high capacity, and the carbon matrix buffers the volume changes of silicon and improves conductivity, thus enhancing cycle life and charge efficiency.

Q3. Is this material used as an anode or a cathode?

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

Related Information

1. Common Manufacturing Methods

The production of double-sided copper foil coated with silicon carbon begins with selecting a high-purity copper foil, which is thoroughly cleaned to remove impurities and surface oxides. A silicon-carbon slurry is prepared by mixing silicon nanoparticles, conductive carbon additives, binders such as polyvinylidene fluoride (PVDF), and solvents like N-methyl-2-pyrrolidone (NMP), ensuring a homogeneous dispersion through ball milling or high-shear mixing. This slurry is then applied to both sides of the copper foil using precise coating techniques such as doctor blade, slot-die, or roll-to-roll coating to achieve uniform thickness and coverage. The coated foil is dried in an oven to evaporate the solvents and partially cure the binder. To improve adhesion, reduce porosity, and increase electrical conductivity, the foil is calendared, compressing the active layers on both sides. The final product is cut to the required sizes and subjected to strict quality control, where thickness uniformity, electrical resistance, coating adhesion, and mechanical stability are examined. The result of this process is a high-performance anode material with improved energy density, cycle stability, and mechanical durability suitable for modern lithium-ion battery applications.