Composite Copper Foil Technology Could Potentially Revolutionize Lithium Batteries

At the CLNB 2025 (10th) New Energy Industry Chain Expo - Battery Auxiliary Materials Forum hosted by SMM Information & Technology Co., Ltd. (SMM), Li Wu, a second-level researcher and doctoral supervisor at the Qinghai Salt Lake Institute of the Chinese Academy of Sciences, shared insights on the topic "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.

1. Development Status

Structure of Composite Copper Foil

Development History of Composite Copper Foil

Composite copper foil is a carnival in the industry, possessing elements such as market demand, capital, hardware, and industrial talent, but lacking rigorous scientific research.

2. Composite Copper Foil

Confusion of Composite Copper Foil

Many existing issues of composite copper foil stem from ambiguous positioning, including: product material; technology selection; equipment route; and application fields.

2. New Technology Routes

1. Physical Image 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

3. Future Prospects

1. Near-term Applications: Drones, Shielding, 3C ESS.

2. Further Future

4. 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."

5. New Energy Composite Materials—Automotive Aluminum-Copper Composite Conductive Bars

Using traditional electrochemical methods, it is impossible to achieve tight bonding of aluminum and copper, and it is also difficult to ensure the mechanical properties of the copper layer. This is the fundamental reason why the issue has remained unresolved for so long.

A concept called "electrochemical stitching" is proposed to achieve "metallurgical bonding" of aluminum and copper, significantly improving processing performance.

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