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Nickel-polytetrafluoroethylene plating and wear-resistant anti-static rolling needle comprising plating

A polytetrafluoroethylene and coating technology, which is applied in the field of wear-resistant and anti-static rolling needles, can solve the problems of complicated preparation method of Teflon coating, inability to eliminate static electricity, and high frequency of rolling needle replacement, so as to reduce the carry-out or puncture The risk of separators and pole pieces, the effect of improving yield and performance stability, and reducing the defect rate of cells

Active Publication Date: 2020-09-08
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of this kind of Teflon coating is relatively complicated, with high energy consumption and high manufacturing cost; the obtained coating Teflon has poor dispersion, serious particle agglomeration, and high frictional resistance. When it is applied to the winding process of lithium batteries, it is easy to Scratches the diaphragm, and it is easy to take out the diaphragm or pole piece when the winding needle is pulled out after winding, and the defective rate of the battery cell is high; the adhesion affinity between Teflon particles and the steel substrate is small, the winding wears and consumes quickly, and the life of the winding needle is short. The replacement frequency is high, the production cost of the battery is high, etc.
[0005] In addition, the current improvement plan also includes coating a layer of nickel and Teflon on the surface of the steel coil needle, and the nickel layer and Teflon are independent layers, and the coating method can increase the two layers. The adhesiveness of the battery can improve the service life and reduce the frequency of replacement during the winding process, but it still cannot eliminate static electricity, and there is still a high risk of defective rate of the battery core

Method used

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  • Nickel-polytetrafluoroethylene plating and wear-resistant anti-static rolling needle comprising plating
  • Nickel-polytetrafluoroethylene plating and wear-resistant anti-static rolling needle comprising plating

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[0052]

[0053] The present invention also provides a method for preparing the above-mentioned coating, the method comprising: preparing the coating by using the above-mentioned nickel-polytetrafluoroethylene mixed plating solution.

[0054] In a preferred solution of the present invention, the method includes: preparing the plating layer by electroplating the above-mentioned nickel-polytetrafluoroethylene mixed plating solution.

[0055] In a preferred version of the present invention, the method comprises the steps of:

[0056] 1) preparing nickel-polytetrafluoroethylene mixed plating solution;

[0057] 2) The element to be plated is used as a cathode plate, and the pure nickel plate is used as an anode plate for electroplating.

[0058] In a preferred solution of the present invention, the temperature of the electroplating is 35-65° C.; the time of the electroplating is 15-90 min.

[0059] In a preferred solution of the present invention, the electroplating is DC electr...

Embodiment 1

[0103] Preparation of nickel-polytetrafluoroethylene mixed plating solution:

[0104] Mix ammoniacal liquor, nickel chloride, polytetrafluoroethylene particles, brightener (tetrabutylammonium bromide) and dispersant (sodium dodecylsulfonate) to obtain the mixed plating solution; wherein the concentration of ammoniacal liquor is 2.5 mol / L, the concentration of nickel chloride is 120g / L, the concentration of polytetrafluoroethylene particles with a particle size of 0.1μm is 9g / L, the concentration of brightener is 0.5g / L, and the concentration of dispersant is 5g / L. The pH of the plating solution was 12.

[0105] Coating preparation:

[0106] Use 250mm long * 10mm wide * 8mm thick nickel plate with a purity ≥ 99.95% as the anode, use surface pretreated 245mm long * 8.5mm wide * 8mm thick high-carbon high-chromium alloy tool steel as the cathode, and the distance between the two electrodes is 3.5cm. The current density of DC constant current plating is 350A / m 2 , the electropl...

Embodiment 2

[0108] Preparation of nickel-polytetrafluoroethylene mixed plating solution:

[0109] Mix ammoniacal liquor, nickel chloride, polytetrafluoroethylene particles, brightener (tetrabutylammonium bromide) and dispersant (sodium dodecylsulfonate) to obtain the mixed plating solution; wherein the concentration of ammoniacal liquor is 2.5 mol / L, the concentration of nickel chloride is 350g / L, the concentration of polytetrafluoroethylene particles with a particle size of 0.1μm is 9g / L, the concentration of brightener is 0.5g / L, and the concentration of dispersant is 5g / L. The pH of the plating solution was 12.

[0110] Coating preparation:

[0111] Use 250mm long * 10mm wide * 8mm thick nickel plate with a purity ≥ 99.95% as the anode, use surface pretreated 245mm long * 8.5mm wide * 8mm thick high-carbon high-chromium alloy tool steel as the cathode, and the distance between the two electrodes is 3.5cm. The current density of DC constant current plating is 350A / m 2 , the electropl...

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Abstract

The invention provides a nickel-polytetrafluoroethylene plating and a wear-resistant anti-static rolling needle comprising the plating. The plating comprises nickel metal particles and polytetrafluoroethylene particles, wherein the nickel metal particles and the polytetrafluoroethylene particles are dispersed in the plating. The plating is obtained by electroplating of a mixed plating solution containing ammonia water, nickel salt and the polytetrafluoroethylene particles, wherein the mixed plating solution is stable in performance, and the polytetrafluoroethylene particles have high dispersity in the mixed plating solution and do not coagulate. In the electroplating process, when nickel ions of nickel-ammine complexing cations adsorbing the polytetrafluoroethylene particles are reduced and deposited on a cathode plate, the polytetrafluoroethylene particles can be released and uniformly co-deposited on the cathode plate along with the nickel ions, and therefore the nickel-polytetrafluoroethylene mixed plating with a smooth and dense surface is obtained.

Description

technical field [0001] The invention relates to the technical field of lithium battery production and related equipment and devices, in particular to a nickel-polytetrafluoroethylene mixed plating solution, a nickel-polytetrafluoroethylene coating and a wear-resistant and antistatic rolling pin containing the coating. Background technique [0002] The production of lithium batteries generally includes steps such as batching, coating, sheet making, winding, packaging, liquid injection, chemical formation, secondary sealing, and sorting and volume separation. As one of the most critical steps in the manufacturing process of lithium batteries, winding has an extremely important impact on the safety performance and life of the battery. The winding main equipment device is a winding needle, which is divided into upper and lower winding needles. There is a gap between the upper and lower winding needles, and the diaphragm is clamped through the gap. Under the traction of the diaph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/02C25D3/12H01M10/0587
CPCC25D15/02C25D3/12H01M10/0587Y02E60/10Y02P70/50
Inventor 林文荣李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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