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Targray offers a complete portfolio of Lithium ion Anode Battery Materials including Graphite, Graphene, SBR and PVDF Binders and Copper Foils.
The anode (or negative electrode) in Lithium-ion battery is typically made up of Graphite, coated on Copper Foil. Graphite is a crystalline solid with a black/grey color and a metallic sheen. Due to its electronic structure, it is highly conductive and can reach 25,000 S/cm2 in the plane of a single-crystal. Graphite is commonly used as the active material in negative electrodes mainly because it can reversibly place Lithium ions between its many layers. This reversible electrochemical capability is maintained over several of thousands of cycles in batteries with optimized electrodes. However, one requirement for this application is that the Graphite surface must be compatible with Lithium-ion battery chemistry (salts, solvents and binders).
A Lithium-ion battery is typically comprised of film electrodes that are arranged on metal foil current collectors, and range in thickness from 40 to 120 µm. Carbon materials in the negative electrode serve as conductive agents as well as electrochemically active materials. They are then mixed with binder/solvent and additives, and applied on a copper foil which acts as the current collector.
Targray supplies a portfolio of Binders materials: Styrene Butadiene Copolymer (SBR) and Polyvinylidene Fluoride (PVDF) , used in the cathode and anode electrode slurry making process for Lithium-ion batteries.
Binders such as SBR and PVDF, are used in Lithium-ion batteries to hold the active material particles together and in contact with the current collectors i.e. the Aluminum Foil (Al foil) or the Copper Foil (Cu foil).
Copper (Cu) Foils
Targray offers a range of Copper foils depending on the application of the Li-ion battery. A rolled foil (RA-type), made from wrought Cu is generally used for high-energy, high-power applications such as drivetrain and power tools. An Electro-Deposited (ED) foil is used in high-energy, low-power applications such as Li-ion batteries for cell phones, laptops and consumer electronics.