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Feature-Tec’s 4th Generation Electrolyte Filtration Solution: “Higher Purity, Greater Stability”
2025-07-04
Electrolyte filtration technology plays a critical role in high-performance copper foil manufacturing, especially in applications across lithium battery production, electronic circuitry, and new energy industries. As copper foil serves as a key material for both the current collector in lithium-ion batteries and the conductive layer in printed circuit boards (PCBs), its quality directly impacts the conductivity stability of electronic devices and the efficiency of battery charge/discharge cycles. With the rapid evolution of the new energy vehicle industry toward longer range and higher energy density, along with increasing demand for miniaturization and lightweight designs in 3C products, copper foil is advancing toward ultra-thinness, low profile, and high ductility. In this context, electrolyte purification has become an essential enabler for the stable production of high-performance copper foil.
Overview of Electrolyte Purification Process Evolution
In the early stages of copper foil production, bag filters were widely adopted for electrolyte purification due to their simple structure, ease of operation, and cost-effectiveness. However, these filters had limited precision and short service life, requiring frequent manual replacement. The need to open the equipment for filter changes also introduced risks of secondary contamination.
To address these issues, the second-generation purification technology introduced horizontal pressure leaf filters. These significantly increased filtration area and capacity, improved impurity capture with a stable structure, and enabled reusability of the filter elements. However, the discharge process still required manual intervention, raising concerns about dust exposure, environmental cleanliness, and operator health.
The third-generation solution marked a shift toward automation and intelligent control. Using PLC systems, the entire process—from fluid intake and filter cake formation to filtration, discharge, and cleaning—can be fully automated. This not only enhances production efficiency but also minimizes risks from manual errors. The filter elements are capable of online cleaning and regeneration, reducing downtime, extending service life, and lowering maintenance costs.
As copper foil applications diversify and Chinese manufacturers strive for higher-end copper foil products, the demands for electrolyte purification continue to increase. Most copper foil production lines currently use a standardized diatomaceous earth filtration system. However, with the emergence of high-quality copper foil lines, more stringent requirements for electrolyte quality have exposed limitations in the existing system. For example, during switching and slag discharge in current systems, supply interruptions or mixing can lead to unstable foil quality, thickness inconsistency, and increased waste due to pressure and impurity fluctuations in the solution.
Feature-Tec’s Breakthrough: “Dynamic Diversion + Dual Check Valve” Electrolyte Purification Technology
Drawing on over a decade of experience in filtration, Feature-Tec has developed an innovative 4th generation electrolyte purification system specifically for the challenges of high-end copper foil production. This new system addresses concerns such as insufficient filtration precision, frequent filter element replacement, complex operations, and airborne contamination.
The upgraded system introduces a unique “dynamic diversion + dual check valve” flow control design that minimizes backflow risk and maintains consistent system pressure. This ensures the stable performance of activated carbon adsorption and electrolyte additives, providing long-term stability in outlet fluid quality. It’s particularly well-suited to high-purity and high-stability requirements of specialized copper foil production lines.
Feature-Tec’s solution provides precise filtration and adsorption to effectively remove solid impurities and organic matter from copper sulfate electrolyte, achieving ultra-clean and stable purification results.
About Feature-Tec
Feature-Tec New Materials is a globally recognized provider of filtration and separation solutions. With over 20 years of expertise in filtration, separation, and purification, we integrate R&D, design, manufacturing, and verification. By 2025, Feature-Tec will operate two production bases in Shanghai and Wuxi, and maintain six branch offices in Shanghai, Beijing, Dalian, Xi’an, Hefei, and Singapore. Our Verification Center, established in 2017, is CNAS-accredited and adheres to CNAS/ISO17025 and GMP-Like compliance systems.
Our solutions span multiple industries, including semiconductor electronics, automotive manufacturing, food & beverage, biopharmaceuticals, chemical processing, water treatment, oil extraction, mechanical processing, green energy, and marine equipment. Our product lineup includes filter cartridges, bags, cloths, and equipment such as automated filtration systems, magnetic separation systems, bag filters, cartridge filters, machining fluid filters, and gas-liquid separators.
Key filtration processes include catalyst recovery, Raney nickel filtration, nano-slurry concentration/washing, amine desulfurization, activated carbon decolorization, silicon steel pickling, dust control, and waste acid concentration.
With customized process optimization and intelligent monitoring capabilities, we support clients in achieving precision, automation, and green production—fulfilling our mission to "make the world cleaner and life better." We invite you to connect with Feature-Tec and join us in building a cleaner and brighter future.
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Hotline: (+86)400-820-6150
Email: marketing@feature-tec.com
Address: 8/F, Block A, Building 3, Tianhua Information Technology Park, 299 Longcao Road, Xuhui District, Shanghai
