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CN-122000278-A - Antioxidant lithium electric copper foil and preparation method thereof

CN122000278ACN 122000278 ACN122000278 ACN 122000278ACN-122000278-A

Abstract

The invention discloses an antioxidant lithium electric copper foil and a preparation method thereof, and relates to the technical field of current collector preparation. The oxidation resisting liquid has corrosion inhibition effect on copper, mercaptobenzothiazole and sodium molybdate can bridge metal copper ions through chemical bonds, can be adsorbed on the surface of a metal copper layer, forms a compact and uniform organic protective film on the copper surface under the participation of triethanolamine, can reduce the permeability of oxygen or water, can effectively prevent oxidation of the copper surface, does not contain zinc ions or chromium and other elements in the oxidation resisting liquid, can meet the performance and safety requirements of high-end lithium battery manufacturers, is colorless, does not need to be cleaned by extrusion liquid, can be directly cleaned by water, does not have residual liquid medicine on the surface of a foil material, can effectively improve the appearance abnormality such as blushing of a composite copper foil, can effectively improve the quality and the product performance of the composite current collector after high-temperature baking, and further improves the service life and the safety performance of the battery.

Inventors

  • LI JUNHONG
  • Deng Wangcheng
  • LI XUEFA

Assignees

  • 扬州纳力新材料科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260309

Claims (10)

  1. 1. The preparation method of the antioxidant lithium electric copper foil is characterized by comprising the following steps of: step 1, taking a polypropylene film, and performing magnetron sputtering on the upper surface and the lower surface of the polypropylene film by adopting a copper target material to form a transitional copper layer; step 2, taking a polypropylene film sputtered with a transition copper layer, placing the polypropylene film in copper plating solution, and performing water electroplating to form a copper plating layer; step 3, placing the polypropylene film with the copper plating layer in an antioxidant liquid, and soaking for 5-10 s to form an antioxidant film, so as to obtain an antioxidant lithium electric copper foil; In the step 3, the antioxidant liquid comprises, by mass, 2.2-2.5% of 2-mercaptobenzothiazole, 7-9% of ethanol, 0.6-0.8% of triethanolamine and 0.3-0.5% of sodium molybdate.
  2. 2. The preparation method of the antioxidant lithium electric copper foil according to claim 1, wherein in the step 3, the mass fraction of the antioxidant liquid is 3-5%.
  3. 3. The method for preparing an antioxidant lithium-ion battery copper foil according to claim 2, wherein in step 1, the thickness of the polypropylene film is 4 μm; The thickness of the transition copper layer is 60nm; The copper plating layer had a thickness of 1. Mu.m.
  4. 4. The method for preparing the anti-oxidation lithium electric copper foil according to claim 3, wherein in the step 1, the magnetron sputtering process conditions are that sputtering power is 40-60W and air pressure is 10-20 Pa.
  5. 5. The preparation method of the antioxidant lithium electric copper foil according to claim 4, wherein in the step 2, copper plating solution comprises the following components, by mass, 10-20 g/L of copper sulfate, 1-3 g/L of sodium hypophosphite and 45-65 g/L of citric acid; The solvent of the copper plating solution is deionized water; the pH value of the copper plating solution is 11-13.
  6. 6. The method for preparing the anti-oxidation lithium electric copper foil according to claim 5, wherein in the step 2, the process conditions of water electrolytic plating are that the temperature is 35-45 ℃, the current is 1.0-1.6A, the voltage is 0.8-1.0V, and the time is 6-10 min.
  7. 7. The method for preparing an antioxidant lithium electric copper foil according to claim 1, wherein the antioxidant liquid further comprises modified carbon nanotubes, and the modified carbon nanotubes are prepared by the following process: mixing the sulfhydrylation carbon nano tube, double bond fluorine-containing siloxane, a photoinitiator and N, N-dimethylformamide, carrying out ultrasonic treatment, adopting ultraviolet irradiation, washing after the reaction is finished, and drying to obtain the modified carbon nano tube.
  8. 8. The method for preparing an antioxidant lithium electric copper foil according to claim 7, wherein the sulfhydryl carbon nanotube is prepared by the following process: And mixing the carboxylated carbon nano tube, deionized water and 1, 4-dimercapto-2, 3-butanediol, uniformly stirring, heating and refluxing for reaction, washing after the reaction is finished, and drying to obtain the sulfhydrylated carbon nano tube.
  9. 9. The method for preparing the antioxidant lithium electric copper foil according to claim 7, wherein the double bond fluorine-containing siloxane is prepared by the following process: Mixing isocyanatopropyl triethoxysilane, 2-allyl-6-fluorophenol, toluene and dibutyltin dilaurate, heating for reaction, adjusting the vacuum degree to 5-10 Kpa, and continuing the reaction for 1-2 hours to obtain double bond fluorine-containing siloxane.
  10. 10. An antioxidant lithium electric copper foil is characterized by being obtained by the preparation method according to any one of claims 1-9.

Description

Antioxidant lithium electric copper foil and preparation method thereof Technical Field The invention relates to the technical field of current collector preparation, in particular to an antioxidant lithium electric copper foil and a preparation method thereof. Background The rapid development of new energy and electronics technology has made battery cycle life, safety performance and energy density important. The current collector collects the current generated by the active substances of the battery to form larger current to be output outwards, which is an important part of the battery, and the performance of the current collector can directly influence the cycle life, the safety performance and the energy density of the battery. In the prior art, most of positive and negative plates in lithium batteries and sodium batteries use copper foil and aluminum foil as current collectors, so that the quality is good, the cost is high, the control of the battery cost and the improvement of the energy density are not facilitated, and therefore, compared with the traditional foil, the composite foil has obvious advantages. The composite foil current collector is generally of a sandwich structure, the inner layer is a polymer high molecular layer, the metal conducting layers are arranged on the two sides of the high molecular layer, and the thickness of the metal layer on the surface is thinner, so that the weight of the whole current collector can be well lightened, the energy density of a lithium ion battery is increased, and compared with a traditional foil current collector, the metal layer is easier to break when the lithium ion battery is out of control, the connection between an active substance and the current collector is isolated, and the thermal runaway is prevented. Although the composite foil has the advantages of low cost and light weight, most of the current composite copper foil adopts an electroplating process to thicken a copper layer, and an antioxidant chemical liquid medicine is used for treatment after the electroplating process meets the requirement of customers, most of the liquid medicine on the market contains zinc ions or chromium and other elements, has weak antioxidant capacity, is required to be cleaned by extruding liquid through a extruding roller, is extremely easy to cause liquid medicine residue, pollutes the composite copper foil, frequently causes abnormal appearance such as the foil to bloom, blush and the like, and has different colors on the film surface after high-temperature baking, thereby affecting the product performance and bringing safety problems to the battery. Therefore, we propose an antioxidation lithium-ion electricity copper foil and a preparation method thereof, which ensures that the composite foil current collector has good antioxidation and conductive effects. Disclosure of Invention The invention aims to provide an antioxidant lithium-ion battery copper foil and a preparation method thereof, which are used for solving the problems in the prior art. In order to achieve the purpose, the invention provides the following technical scheme that the preparation method of the antioxidant lithium electric copper foil comprises the following steps: step 1, taking a polypropylene film, and performing magnetron sputtering on the upper surface and the lower surface of the polypropylene film by adopting a copper target material to form a transitional copper layer; step 2, taking a polypropylene film sputtered with a transition copper layer, placing the polypropylene film in copper plating solution, and performing water electroplating to form a copper plating layer; and 3, placing the polypropylene film with the copper plating layer in an antioxidant liquid, and soaking for 5-10 s to form an antioxidant film, thereby obtaining the antioxidant lithium electric copper foil. Further, in the step 1, the thickness of the polypropylene film is 4 μm; The thickness of the transition copper layer is 60nm; The copper plating layer had a thickness of 1. Mu.m. In the step 1, the magnetron sputtering process conditions are that the sputtering power is 40-60W and the air pressure is 10-20 Pa. In the step 2, the copper plating solution comprises the following components, by mass, 10-20 g/L of copper sulfate, 1-3 g/L of sodium hypophosphite and 45-65 g/L of citric acid; The solvent of the copper plating solution is deionized water; the pH value of the copper plating solution is 11-13. In the step 2, the process conditions of the hydropower plating are that the temperature is 35-45 ℃, the current is 1.0-1.6A, the voltage is 0.8-1.0V, and the time is 6-10 min. In the step3, the antioxidant liquid comprises, by mass, 2.2-2.5% of 2-mercaptobenzothiazole, 7-9% of ethanol, 0.6-0.8% of triethanolamine and 0.3-0.5% of sodium molybdate; the antioxidant liquid solvent is deionized water. In the step 3, the mass fraction of the antioxidant liquid is 3-5%. Further, the antioxidant liquid also contains