Production technology for rolled copper foil for lithium battery

Abstract

The invention discloses a production technology for rolled copper foil for a lithium battery. Rough rolling, intermediate annealing, intermediate rolling, semi-finished product annealing, finished product rolling, anti-sticking agent spraying, finished product annealing, finished product cleaning and splitting processing are conducted on a selected TU2 anaerobic copper casting blank, then the rolled copper foil for the lithium battery is obtained, and the content of copper of the copper foil product is larger than 99.97%, the copper foil is in a soft state M, the tensile strength of the copper foil is larger than or equal to 140 MPa, ductility is larger than or equal to 10%, and electrical conductivity is larger than or equal to 100% of the IACS. The performance movement and balance of the copper foil are good, most obviously, ductility is improved, so that in the production technology of the lithium ion battery production technology, the copper foil is not prone to being broken when being pressed, and the finished product rate is increased.

Description

technical field [0001] The invention relates to a production process of rolled copper foil for lithium batteries. Background technique [0002] In recent years, with the rapid development of global mobile terminal equipment, the country has vigorously supported new energy electric vehicles, and the demand for lithium batteries has also expanded rapidly. Copper foil is one of the key materials for the production of lithium-ion batteries, and its quality directly affects the manufacturing process and overall performance of lithium-ion batteries. As the cathode current collector of lithium-ion batteries, copper foil has high performance requirements, and it is difficult to achieve a balance. The performance of the existing electrolytic copper foil is unstable and cannot meet the performance requirements of copper foil for lithium-ion battery production. In addition, in the existing technology, the copper content of general-purpose electrolytic copper foil is ≥99.98%, showing...

AI Technical Summary

Problems solved by technology

As the cathode current collector of lithium-ion batteries, copper foil has high performance requirements, and the balance is difficult to achieve. The performance of the existing electrolytic copper foil is unstable and cannot meet the performance requirements of copper foil for lithium-ion battery production.

In addition, in the existing technology, the copper content of general-purpose electrolytic copper foil is ≥99.98%, showing a hard Y state, the tensile strength is ≥350MPa, and the elongation is ≥8%. Pressing, although it is a slight change, but the low elongation often causes the copper foil to break and reduce the yield