Expert Post: Prospects of Composite Copper Foil Preparation Technology and Its Application Advantages in Lithium Batteries [New Energy Summit]

At the 2025 (10th) New Energy Industry Expo - Battery Auxiliary Materials Forum hosted by SMM Information & Technology Co., Ltd. (SMM), Li Wu from the Qinghai Salt Lake Institute of the Chinese Academy of Sciences shared insights on the topic of "Prospects of Composite Copper Foil Preparation Technology and Its Application Advantages in Lithium Batteries." The role of copper-based current collectors in lithium battery anodes includes carrying active materials, collecting and outputting current, and influencing C-rate, internal resistance, and energy density. I. Development Status Structure of Composite Copper Foil Development History of Composite Copper Foil Composite copper foil represents a carnival in the industry, equipped with market demand, capital, hardware, and industrial talent, yet lacking rigorous scientific research. II. Composite Copper Foil Confusion Surrounding Composite Copper Foil Numerous existing issues with composite copper foil stem from ambiguous positioning, including product material, technology selection, equipment route, and application fields. II. New Technology Routes 1. Physical Diagram of Chemically Prepared Composite Copper Foil 2. Durability of the Obtained Composite Copper Foil in Electrolyte 3. Application of the Obtained Composite Copper Foil in Batteries 4. Further Optimization of the Process 5. The Most Prominent Advantage—Flexibility III. Future Prospects 1. Near-term Applications: Drones, Shielding, 3C ESS. 2. Further Future IV. Other Special Copper Foils—Taking Porous Copper Foil as an Example 3D porous copper foil is a key current collector material that constrains the development of future solid-state batteries, and there is currently no mass production worldwide. International Competition: Israeli startup Addionics secures $39 million in new investment. Addionics' first copper foil factory is expected to start production in 2027, with more factories to be built by 2032. CEO and co-founder Moshiel Biton stated: "The company plans to build multiple factories in three phases, which will produce tens of thousands of mt of 3D copper foil annually, helping to reduce the overall production cost of US batteries, strengthen supply chain stability, and promote local battery production." V. New Energy Composite Materials—Automotive Aluminum-Copper Composite Conductive Bars Traditional electrochemical methods cannot achieve tight bonding of aluminum and copper, nor can they ensure the mechanical properties of the copper layer. Thus, the fundamental reason for the long-standing unresolved issue is studied. A concept called "electrochemical stitching" is proposed to achieve "metallurgical bonding" of aluminum and copper, significantly improving processing performance. Click to view the special report on the 2025 (10th) New Energy Industry Expo.