Preparation method of negative electrode composite current collector and product prepared by preparation method

A current collector and negative electrode technology, which is applied in the field of preparation method and its products, can solve the problems of poor binding force, many surface defects, and poor electrical conductivity, and achieve the goals of reducing internal resistance, less surface defects, and improving electrical conductivity. Effect

Pending Publication Date: 2022-06-28
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology

[0005] Aiming at the problems of poor bonding force between the polymer film and the metal layer and many surface defects in the existing negative electrode composite current collector, the present invention provides a method for preparing the negative electrode composite current collector. The negative electrode prepared by the method is The composite current collector polymer film has strong bonding force with the metal layer, less surface defects, and good electrical conductivity

Method used

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  • Preparation method of negative electrode composite current collector and product prepared by preparation method
  • Preparation method of negative electrode composite current collector and product prepared by preparation method
  • Preparation method of negative electrode composite current collector and product prepared by preparation method

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preparation example Construction

[0034] A kind of preparation method of negative electrode composite current collector of the present invention, such as figure 2 As shown, it specifically includes the following steps:

[0035] (1) Prepare the support layer 100: uniformly mix the polymer masterbatch and additives to form a modified polymer film, and roughen the modified polymer film to obtain a support layer 100 with many vacancies on the surface;

[0036] (2) Activation: activate the support layer 100 obtained in step (1) to generate metal particles on the surface;

[0037] (3) Electroless plating: the first metal layer 210 and the second metal layer 220 of a certain thickness are respectively grown on both sides of the support layer 100 after the activation treatment in step (2) by means of electroless plating;

[0038] (4) Electroplating: the third metal layer 310 and the fourth metal layer 320 are respectively grown on both sides of the first metal layer 210 and the second metal layer 220 by electroplati...

Embodiment 1

[0040] (1) Preparation of support layer 100: uniformly mix PP (polypropylene) masterbatch, calcium carbonate, and lubricant by filling, and biaxially stretch the film to form support layer 100, and soak the obtained support layer 100 in strong acid Coarsening, through the roll-to-roll method at a speed of 2-20m / min to roughen the surface of the roughening solution, the concentration of chromic acid in the roughening solution is 300-500g / L, and the concentration of sulfuric acid is 400-500g / L;

[0041] (2) Activation: the support layer 100 is activated by using a base colloidal palladium activation process, and the support layer 100 passes through the base colloidal palladium activation solution pool and then passes through an oven to solidify the activation solution to activate the support layer 100;

[0042] (3) Electroless plating: pass the support layer 100 after the activation treatment in step (2) through the electroless plating bath, and form a first metal layer 210 and a...

Embodiment 2

[0045] (1) Prepare the support layer 100: uniformly mix PI (polyimide) masterbatch and talc powder by filling, and biaxially stretch the film to form the support layer 100, and pass the obtained support layer 100 through the roll-to-roll method After femtosecond laser etching to roughen the surface, the femtosecond laser etching process parameters are: power 2.0 W, spot diameter 0.2 mm, scan rate 12 mm / s;

[0046] (2) Activation: The support layer 100 is activated by using a laser-induced activation process. The support layer 100 passes through a metal salt activation solution, the metal salt is a copper salt, and then passes through an oven to solidify the activation solution, and uses laser induction to make the support layer 100 activation;

[0047] (3) Electroless plating: pass the support layer 100 after the activation treatment in step (2) through the electroless plating bath, and form a first metal layer 210 and a second metal layer with a thickness of 500 nm on both si...

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Abstract

The invention discloses a preparation method of a negative electrode composite current collector and a product prepared by the preparation method, and belongs to the technical field of lithium ion batteries. According to the method, polymer master batches and an additive are uniformly mixed to prepare a modified polymer film, the modified polymer film is subjected to roughening treatment to obtain a supporting layer with multiple vacancies on the surface, and metal particles are generated on the surface of the supporting layer through activating treatment; respectively growing a first metal layer and a second metal layer with a certain thickness on the two sides of the activated supporting layer in a chemical plating mode, and finally respectively depositing a third metal layer and a fourth metal layer on the two sides of the first metal layer and the second metal layer in an electroplating mode. The negative electrode composite current collector prepared by the method has the advantages of no surface defect, small internal stress of the plating layer, small resistivity of the plating layer, low production cost and easy realization of large-scale mass production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and more specifically relates to a method for preparing a negative electrode composite current collector and a product thereof. Background technique [0002] With the continuous development of the lithium-ion battery industry, people are increasingly pursuing high energy density and lightweight batteries. The current collector is an important part of the battery. Reducing the quality of the current collector is an effective method to achieve high energy density and light weight of the battery. At present, the preparation method of the negative electrode composite current collector is mainly through vacuum evaporation or vacuum magnetron sputtering. way of preparation. The Chinese invention patent with the publication number CN107369810A discloses "a negative current collector, its preparation method and its application". The adhesion enhancing layer is coated on the plastic film by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525C23C28/02C23C18/30C23C18/38C23C18/42C25D5/10C25D7/06C25D5/56
CPCH01M4/661H01M4/667H01M10/0525C23C28/023C23C18/1653C23C18/30C23C18/204C23C18/38C23C18/42C25D5/10C25D7/0614C25D5/56
Inventor 陈启武许涛王磊张江伟王义飞
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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