Lithium copper foil It is an important part of lithium ion battery and one of electrode materials. Its quality and performance have an important impact on the performance and life of the battery. This article will introduce the preparation technology of lithium copper foil, as well as the commonly used preparation methods.

1、 Preparation Technology of Lithium Electrolytic Copper Foil

The preparation technology of lithium copper foil mainly includes physical method, chemical method and electrochemical method. Physical methods include rolling, stretching, etc., chemical methods include sputtering, electrolysis, etc., and electrochemical methods include electrodeposition, anodic oxidation, etc. Each of these methods has advantages and disadvantages, and appropriate preparation methods can be selected according to needs.

2、 Rolling method

Rolling is a physical method for preparing lithium copper foil. Its principle is to obtain copper foil by rolling and annealing high-purity copper plate for many times. When preparing lithium copper foil, the copper foil needs further treatment, such as removing oxide film, to meet the requirements of battery application. The advantages of rolling method are high production efficiency, relatively low cost, and high purity copper foil can also be obtained. The disadvantage is that the crystallization direction and thickness of the copper foil can not be controlled, thus affecting the performance and life of lithium copper foil.

3、 Sputter method

Sputtering is a chemical method for preparing lithium copper foil. Its principle is to place high-purity copper target material in a vacuum chamber, bombard the target with ion beam, evaporate and deposit it on the substrate to form copper foil. The advantage of sputtering method is that it can obtain high-purity and uniform copper foil, and control the crystallization direction and thickness of copper foil, thus improving the performance and life of lithium copper foil. The disadvantage is that the production cost is high.

4、 Electrodeposition

Electrodeposition is an electrochemical method for preparing lithium electrolytic copper foil. Its principle is to use current to deposit copper ions on the electrode surface and gradually form copper foil. This method can control the thickness, morphology, microstructure and other characteristics of copper foil, and can obtain high-quality lithium copper foil. The advantage of electrodeposition is that high-quality lithium copper foil can be obtained, the cost is relatively low, and the production efficiency is high. The disadvantages of the electrodeposition method include the non-uniformity of the electrode surface, the susceptibility to impurity contamination, and the need to treat a large number of waste liquid. In addition, the copper foil prepared by electrodeposition is usually fragile and prone to fracture and crazing, which also needs attention.

5、 Summary

In modern science and technology, lithium battery copper foil is an important part of the battery electrode. Its preparation technology and quality have an important impact on the performance and life of the battery. According to needs and requirements, different preparation methods can be selected for production. Rolling method, sputtering method and electrodeposition method have their own characteristics, and suitable methods can be selected according to actual needs. With the continuous progress and development of science and technology, the preparation technology of lithium battery copper foil will also be continuously optimized and improved to provide better guarantee for the performance of the battery.