CN-121986183-A - Method for preparing lithium battery composite current collector and equipment for preparing lithium battery composite current collector

Abstract

A method of making a lithium battery composite current collector and an apparatus (10) for making a lithium battery composite current collector. The method includes evaporating a first target to produce a first target vapor, ionizing the first target vapor to form a first ionized structure on a first side of a base film, the first ionized structure including at least two ion layers each having a different ionization rate, and evaporating a second target to form a metal layer including a second target over the first ionized structure.

Inventors

• GUO BEI
• SHEN XUEZHONG

Assignees

• 纳狮新材料股份有限公司
• 东莞瀚晶纳米材料有限公司

Dates

Publication Date

20260505

Application Date

20231229

Claims (20)

1. A method of preparing a lithium battery composite current collector, comprising: Evaporating the first target to produce a first target vapor; Ionizing the first target vapor to form a first ionized structure on a first side of the base film, the first ionized structure comprising at least two ion layers each having a different ionization rate, and The second target is evaporated to form a metal layer comprising the second target over the first ionization structure.
2. The method of claim 1, wherein ionizing the first target vapor to form the first ionized structure at the first side of the base film comprises: Forming a first ion layer over the first side of the base film; Forming a second ion layer over the first ion layer, and Forming a third ion layer over the second ion layer; Wherein the ionization rates of the first, second, and third ion layers are different.
3. The method of claim 2, wherein the ionization rate of the first, second, and third ion layers is increased.
4. The method of claim 2, wherein the ionization rate of the first, second, and third ion layers decreases.
5. The method of claim 2, wherein the ionization rate of the first and third ion layers is less than the ionization rate of the second ion layer.
6. The method of claim 2, wherein the ionization rate of the first and third ion layers is greater than the ionization rate of the second ion layer.
7. The method of claim 2, wherein ionizing the first target vapor to form the first ionized structure at the first side of the base film further comprises: forming a fourth ion layer over the third ion layer; Forming a fifth ion layer over the fourth ion layer, and Forming a sixth ion layer over the fifth ion layer; wherein the ionization rates of the fourth, fifth and sixth ion layers are different.
8. The method of claim 7, wherein the ionization rate of the fourth, fifth, and sixth ion layers is increased.
9. The method of claim 7, wherein the ionization rate of the fourth, fifth, and sixth ion layers decreases.
10. The method of claim 7, wherein the ionization rate of the fourth and sixth ion layers is less than the ionization rate of the fifth ion layer.
11. The method of claim 7, wherein the ionization rate of the fourth and sixth ion layers is greater than the ionization rate of the fifth ion layer.
12. The method according to any one of claims 1 to 11, further comprising: evaporating the third target to produce a third target vapor; ionizing the third target vapor to form a second ionized structure on a second side of the base film, wherein the second side is opposite to the first side, the second ionized structure comprising at least two ion layers, each having a different ionization rate, and Evaporating the second target to form a metal layer comprising the second target over the second ionization structure.
13. The method of claim 12, wherein forming the second ionization structure on the second side of the base film comprises: forming a seventh ion layer over the second side of the base film; forming an eighth ion layer over the seventh ion layer, and Forming a ninth ion layer over the eighth ion layer; Wherein the ionization rates of the seventh, eighth, and ninth ion layers are different.
14. The method of claim 13, wherein the ionization rate of the seventh, eighth, and ninth ion layers is increased.
15. The method of claim 13, wherein the ionization rate of the seventh, eighth, and ninth ion layers decreases.
16. The method of claim 13, wherein the seventh and ninth ion layers have a smaller ionization rate than the eighth ion layer.
17. The method of claim 13, wherein the seventh and ninth ion layers have greater ionization rates than the eighth ion layer.
18. The method of claim 13, wherein forming the second ionization structure on the second side of the base film further comprises: forming a tenth ion layer over the ninth ion layer; forming an eleventh ion layer over the tenth ion layer, and Forming a twelfth ion layer over the eleventh ion layer; wherein the ionization rates of the tenth, eleventh, and twelfth ion layers are different.
19. The method of claim 18, wherein the ionization rate of the tenth, eleventh, and twelfth ion layers is increased.
20. The method of claim 18, wherein the ionization rate of the tenth, eleventh, and twelfth ion layers decreases.

Description

Method for preparing lithium battery composite current collector and equipment for preparing lithium battery composite current collector Technical Field The invention belongs to the field of lithium battery composite current collectors, and particularly relates to a method for preparing a lithium battery composite current collector and equipment for preparing the lithium battery composite current collector. Background Along with the continuous growth of new energy automobile industry, the demand of lithium ion batteries also rises rapidly, and a current collector is used as one of indispensable component parts in the lithium ion batteries, so that the current collector not only can bear active substances, but also can collect and output current generated by electrode active substances. The composite current collector is a three-layer composite structure of metal-high polymer material-metal formed by stacking metal atoms on two sides of a composite material by taking a raw material film such as PET/PP as a base film through a vacuum coating process and the like. At present, common vacuum preparation modes are basically one or combination of magnetron sputtering and evaporation coating, after a nm-level priming layer is formed on the surface of the magnetron sputtering, a metal layer is thickened by adopting a vacuum evaporation method and the like, and in the process, how to ensure good adhesion between a base film and a coating layer is a key for the subsequent stable operation of a composite current collector. Disclosure of Invention In view of the above, the present application provides a method for preparing a lithium battery composite current collector and an apparatus for preparing a lithium battery composite current collector to enhance the bonding force between a base film and a subsequent metal layer and improve the stress in the film layer. According to an embodiment of the application, a method of preparing a lithium battery composite current collector is provided, the method comprising evaporating a first target to produce a first target vapor, ionizing the first target vapor to form a first ionized structure on a first side of a base film, the first ionized structure comprising at least two ion layers each having a different ionization rate, and evaporating a second target to form a metal layer comprising a second target over the first ionized structure. In some embodiments, ionizing the first target vapor to form the first ionized structure on the first side of the base film includes forming a first ion layer over the first side of the base film, forming a second ion layer over the first ion layer, and forming a third ion layer over the second ion layer, wherein the ionization rates of the first, second, and third ion layers are different. In certain embodiments, the ionization rate of the first, second, and third ion layers is incremented. In certain embodiments, the ionization rate of the first, second, and third ion layers decreases. In certain embodiments, the ionization rate of the first and third ion layers is less than the ionization rate of the second ion layer. In certain embodiments, the ionization rate of the first and third ion layers is greater than the ionization rate of the second ion layer. In some embodiments, ionizing the first target vapor to form the first ionized structure on the first side of the base film further comprises forming a fourth ion layer over the third ion layer, forming a fifth ion layer over the fourth ion layer, and forming a sixth ion layer over the fifth ion layer, wherein the ionization rates of the fourth, fifth, and sixth ion layers are different. In certain embodiments, the ionization rate of the fourth, fifth, and sixth ion layers is incremented. In certain embodiments, the ionization rate of the fourth, fifth, and sixth ion layers decreases. In certain embodiments, the ionization rate of the fourth and sixth ion layers is less than the ionization rate of the fifth ion layer. In certain embodiments, the ionization rate of the fourth and sixth ion layers is greater than the ionization rate of the fifth ion layer. In some embodiments, the method further comprises vaporizing a third target to produce a third target vapor, ionizing the third target vapor to form a second ionized structure on a second side of the base film, wherein the second side is opposite the first side, the second ionized structure comprising at least two ion layers each having a different ionization rate, and vaporizing the second target to form a metal layer comprising the second target over the second ionized structure. In some embodiments, forming the second ionization structure on the second side of the base film includes forming a seventh ion layer over the second side of the base film, forming an eighth ion layer over the seventh ion layer, and forming a ninth ion layer over the eighth ion layer, wherein the ionization rates of the seventh, eighth, and ninth ion layers are dif