CN111621820A - High-wear-resistance anti-static winding needle and preparation method thereof - Google Patents
High-wear-resistance anti-static winding needle and preparation method thereof Download PDFInfo
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- CN111621820A CN111621820A CN202010457742.2A CN202010457742A CN111621820A CN 111621820 A CN111621820 A CN 111621820A CN 202010457742 A CN202010457742 A CN 202010457742A CN 111621820 A CN111621820 A CN 111621820A
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- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/562—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of iron or nickel or cobalt
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- C—CHEMISTRY; METALLURGY
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- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
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Abstract
The invention provides a high-wear-resistance anti-static winding needle and a preparation method thereof. According to the invention, the nickel-cobalt-polytetrafluoroethylene mixed plating solution is deposited on the coil needle substrate in an electroplating manner, and the coil needle is applied to the production process, compared with a steel or pure nickel layer, the nickel-cobalt alloy has higher strength and hardness, so that the wear resistance and the service life of the coil needle are greatly improved; the polytetrafluoroethylene in the coating has high-lubrication and low-friction properties, so that the friction force between the winding needle and the diaphragm can be greatly reduced, and the reject ratio of the battery cell caused by the extraction process of the winding needle is effectively reduced; and because the nickel-cobalt has conductivity, the static electricity carried by the diaphragm and the static electricity generated in the winding process can be eliminated through the nickel-cobalt-polytetrafluoroethylene coating on the surface of the winding needle, the possibility that dust or other foreign matters are adsorbed on the battery cell is reduced, and the yield and the performance stability of the battery cell are improved.
Description
Technical Field
The invention relates to the technical field of lithium battery production and related equipment and devices, in particular to a high-wear-resistance anti-static winding needle and a preparation method thereof.
Background
The production of lithium batteries generally comprises the steps of material preparation, coating, sheet preparation, winding, packaging, liquid injection, formation, secondary packaging, sorting and capacity grading and the like. Winding, as one of the most critical steps in the manufacturing process of lithium batteries, has an extremely important influence on the safety and life of the batteries. The winding main body device is a winding needle which is divided into an upper winding needle and a lower winding needle, the upper winding needle and the lower winding needle have gaps, the diaphragm is clamped through the gaps, the winding of the positive plate, the diaphragm and the negative plate is realized under the traction of the diaphragm, so that a winding core is manufactured, the winding needle is drawn out from the winding core after the winding is finished, and all actions of the process are finished. The traditional winding needle is generally a steel winding needle, the friction resistance is large, and the surface of the diaphragm is generally a glue coating or ceramic coating surface, so that the pole piece or the diaphragm is easily taken out or even directly scraped in the process of drawing out the winding needle, and the risk of short circuit in the winding core is increased.
In order to solve the above problems, polytetrafluoroethylene (commonly known as teflon) with low friction and high lubrication is generally adopted to be attached to the surface of a winding needle and then wound. However, teflon has low hardness and no wear resistance, so that teflon needs to be frequently replaced in the winding process, which affects efficiency; in addition, in the winding process, the mutual friction between teflon and the diaphragm is easy to generate larger static electricity, so that external dust or other impurities are easily adsorbed, the defect rate of the battery cell is higher, the performance of the battery cell is reduced, and the like.
In addition, the existing improvement scheme is that a nickel layer and a Teflon layer are respectively coated on the surface of the steel coil needle, the nickel layer and the Teflon layer are respectively independent layers, the adhesiveness of the nickel layer and the Teflon layer can be increased by a coating method, the service life is prolonged, the replacement frequency in the winding process is reduced, static electricity cannot be eliminated, and meanwhile, the reject ratio of the battery cell still has higher risk.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a high-wear-resistance anti-static winding needle and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
a coating, wherein the coating comprises nickel, cobalt and polytetrafluoroethylene.
According to the invention, said nickel and said cobalt are present in the form of a nickel-cobalt alloy, said polytetrafluoroethylene being dispersed in the nickel-cobalt alloy.
According to the invention, the mass ratio of the nickel-cobalt alloy to the polytetrafluoroethylene is 100:5-100: 30.
According to the invention, the mass ratio of nickel to cobalt is between 50:1 and 5: 1.
According to the invention, the Vickers hardness HV of the coating is not less than 450. The test condition is a diamond regular rectangular pyramid pressure head with an included angle of 136 degrees between two surfaces, the load force is 100g, and the loading time is 15 s.
According to the invention, the friction coefficient of the coating is less than or equal to 0.5. The test condition is that a slide block weighing 500g is adopted to carry out back and forth traction movement on the surface of the sample to be tested at the speed of 200mm/min, and the test is carried out for 10 min.
According to the invention, the abrasion loss of the coating is less than or equal to 2.5 mg/h. The test condition is that under the condition of a steel ball with the load of 500g, the back-and-forth friction test is carried out on the surface of the steel plate final product for 30min at the speed of 100r/min of the repetition frequency.
The preparation method of the coating comprises the following steps:
electroplating a nickel-cobalt-polytetrafluoroethylene mixed plating solution to prepare the plating layer;
wherein, the nickel-cobalt-polytetrafluoroethylene mixed plating solution comprises water, nickel salt, cobalt salt and polytetrafluoroethylene.
According to the present invention, the nickel-cobalt-polytetrafluoroethylene mixed plating solution further includes one, two or more of a buffer, a brightener and a surfactant.
According to the invention, the nickel salt is selected from one or two of nickel sulfate and nickel chloride, and the addition amount of the nickel salt is 180-350 g/L; the cobalt salt is selected from one or two of cobalt chloride and cobalt sulfate, and the addition amount of the cobalt salt is 5-50 g/L.
According to the invention, the particle size of the polytetrafluoroethylene is 0.05-5 μm, and the addition amount of the polytetrafluoroethylene is 3-20 g/L.
According to the invention, the temperature of the electroplating is 40-70 ℃; the electroplating time is 10min-2 h; the electroplating is direct current electroplating with current density of 2-6A/dm2。
A winding needle comprises a winding needle substrate and a coating on the surface of the winding needle substrate, wherein the coating is the coating.
The invention has the beneficial effects that:
the invention provides a high-wear-resistance anti-static winding needle and a preparation method thereof. The invention deposits the nickel-cobalt-polytetrafluoroethylene mixed plating solution on the needle winding substrate in an electroplating way, thereby preparing the high-wear-resistance anti-static needle winding. Compared with a steel or pure nickel layer, the nickel-cobalt alloy has higher strength and hardness, the wear resistance of the winding needle is greatly improved, and the service life of the winding needle is greatly prolonged; the polytetrafluoroethylene in the coating has high-lubrication and low-friction properties, so that the friction force between the winding needle and the diaphragm can be greatly reduced, and the reject ratio of the battery cell caused by the extraction process of the winding needle is effectively reduced; and because the nickel-cobalt has conductivity, the static electricity carried by the diaphragm and the static electricity generated in the winding process can be eliminated through the nickel-cobalt-polytetrafluoroethylene coating on the surface of the winding needle, the possibility that dust or other foreign matters are adsorbed on the battery cell is reduced, and the yield and the performance stability of the battery cell are improved.
Drawings
FIG. 1 is a schematic view of the needle winding structure of examples 1 to 3.
Detailed Description
< Nickel-cobalt-polytetrafluoroethylene Mixed plating solution >
As described above, the present invention provides a nickel-cobalt-polytetrafluoroethylene mixed plating solution, which includes water, a nickel salt, a cobalt salt, and polytetrafluoroethylene.
In a preferred embodiment of the present invention, the plating solution further comprises one, two or three of a buffer, a brightener and a surfactant.
In a preferred embodiment of the present invention, the nickel-cobalt-polytetrafluoroethylene mixed plating solution is used in the field of lithium ion batteries.
In a preferred embodiment of the present invention, the nickel-cobalt-polytetrafluoroethylene mixed plating solution is used for a lithium ion battery winding needle, and further, is used for a plating layer of the lithium ion battery winding needle.
In a preferred embodiment of the present invention, the plating solution is composed of water, nickel salt, cobalt salt, polytetrafluoroethylene, buffer, brightener, and surfactant.
In a preferred embodiment of the invention, the nickel salt is selected from soluble salts of nickel, such as one or both of nickel sulfate and nickel chloride, and also such as nickel sulfate, or a combination of nickel sulfate and nickel chloride. The nickel salt can be reduced to separate out metal nickel with a compact structure, and the metal nickel also has the characteristics of high hardness, good wear resistance and the like.
In a preferred embodiment of the present invention, the amount of the nickel salt added is 180-350g/L, such as 180g/L, 190g/L, 200g/L, 210g/L, 220g/L, 230g/L, 240g/L, 250g/L, 260g/L, 270g/L, 280g/L, 290g/L, 300g/L, 320g/L, 350 g/L.
Illustratively, when the nickel salt is nickel sulfate, the addition amount of the nickel sulfate is 250-350g/L, such as 250g/L, 260g/L, 270g/L, 280g/L, 290g/L, 300g/L, 320g/L and 350 g/L;
when the nickel salt is the combination of nickel sulfate and nickel chloride, the addition amount of the nickel sulfate is 150-250g/L, such as 150g/L, 160g/L, 170g/L, 180g/L, 190g/L, 200g/L, 210g/L, 220g/L, 230g/L, 240g/L and 250g/L, and the addition amount of the nickel chloride is 30-80g/L, such as 30g/L, 40g/L, 50g/L, 60g/L, 70g/L and 80 g/L.
In a preferred embodiment of the present invention, the cobalt salt is selected from soluble salts of cobalt, for example, one or two selected from cobalt chloride and cobalt sulfate, preferably cobalt sulfate. The cobalt salt is added to form an alloy with nickel in the electroplating process, and the nickel-cobalt alloy has higher strength and hardness, so that the compactness and the wear resistance of the plating layer are greatly improved.
In a preferred embodiment of the invention, the addition amount of the cobalt salt is 5-50 g/L; for example, 5g/L, 10g/L, 15g/L, 20g/L, 25g/L, 30g/L, 35g/L, 40g/L, 45g/L, 50 g/L.
In a preferred embodiment of the present invention, the polytetrafluoroethylene is polytetrafluoroethylene micropowder, and the particle size of the polytetrafluoroethylene is 0.05 to 5 μm, for example, 0.05 to 0.5 μm. The polytetrafluoroethylene ultrafine powder is dispersed in the nickel-cobalt-polytetrafluoroethylene mixed plating solution, and the polytetrafluoroethylene is subjected to codeposition with nickel and cobalt on a substrate under the combined action of an electric field and electrophoresis, so that a nickel-cobalt-polytetrafluoroethylene plating layer is obtained, the addition of the polytetrafluoroethylene enables the plating layer to have high lubrication and low friction performance, and meanwhile, the friction force between a winding needle and a diaphragm can be greatly reduced.
In a preferred embodiment of the invention, the polytetrafluoroethylene is added in an amount of 3-20g/L, preferably 5-10 g/L; for example, 3g/L, 4g/L, 5g/L, 6g/L, 7g/L, 8g/L, 9g/L, 10g/L, 12g/L, 15g/L, 18g/L, 20 g/L.
In a preferred embodiment of the present invention, the buffer is selected from one, two or more of boric acid, phosphoric acid, acetic acid, and malic acid. The addition of the buffering agent can ensure the acid-base stability of the mixed plating solution, so that the nickel-cobalt-polytetrafluoroethylene plating layer with uniform distribution can be prepared.
In a preferred embodiment of the present invention, the buffer is added in an amount of 5 to 30 g/L; for example, 5g/L, 10g/L, 15g/L, 20g/L, 25g/L, 30g/L, 35g/L, 40 g/L.
In a preferred embodiment of the present invention, the brightener is one, two or more selected from the group consisting of o-benzoylsulfonimide, dihydroxydimethylacetylene, sodium vinylsulfonate. Preferably, the brightener is selected from the following components in mass-to-volume ratio: 5-15g of o-benzoylsulfonimide, 0.5-5g of dihydroxydimethylacetylene and 50-150mL of sodium vinyl sulfonate. The addition of the brightener can improve the flatness of the plating and reduce the generation of dendrites or burrs.
In a preferred embodiment of the present invention, the brightener is added in an amount of 10 to 15mL/L, for example, 10mL/L, 11mL/L, 12mL/L, 13mL/L, 14mL/L, 15 mL/L.
In a preferred embodiment of the present invention, the surfactant is selected from one, two or more of sodium vinyl sulfonate, polyethylene glycol, sodium dodecyl sulfonate and sodium dodecyl sulfate. The addition of the surfactant can reduce the side reaction of cathodic hydrogen evolution, reduce the generation of coating pinholes and improve the compactness on one hand, and can be combined with polytetrafluoroethylene on the other hand to be adsorbed on the surface of a coating to complete codeposition, thereby ensuring the uniform distribution of the polytetrafluoroethylene on the coating.
In a preferred embodiment of the invention, the surfactant is added in an amount of 0.1 to 1g/L, for example 0.1g/L, 0.2g/L, 0.3g/L, 0.4g/L, 0.5g/L, 0.6g/L, 0.7g/L, 0.8g/L, 0.9g/L, 1 g/L.
In a preferred embodiment of the present invention, the pH of the nickel-cobalt-polytetrafluoroethylene mixed plating solution is 3 to 5.
< coating layer >
The invention also provides a plating layer, which comprises nickel, cobalt and polytetrafluoroethylene.
Wherein the nickel and cobalt are present in the form of a nickel-cobalt alloy.
Wherein the polytetrafluoroethylene is dispersed in a nickel-cobalt alloy.
In a preferred embodiment of the present invention, the mass ratio of the nickel-cobalt alloy to the polytetrafluoroethylene in the plating layer is 100:5 to 100:30, for example, 100:5, 100:10, 100:15, 100:20, 100:25, 100: 30.
In a preferred embodiment of the invention, the mass ratio of nickel and cobalt in the coating is 50:1 to 5:1, such as 50:1, 45:1, 40:1, 35:1, 30:1, 25:1, 20:1, 15:1, 10:1, 5: 1.
In a preferred embodiment of the present invention, at least one of a buffer, a brightener, and a surfactant is included in the plating.
In a preferred embodiment of the invention, the Vickers hardness HV of the coating is 450 or more, for example 500-700.
In a preferred embodiment of the invention, the coefficient of friction of the coating is ≦ 0.5, for example, 0.15 to 0.45.
In a preferred embodiment of the invention, the wear of the coating is less than or equal to 2.5mg/h, for example 1-2 mg/h.
In a preferred embodiment of the present invention, the plating layer is prepared by the nickel-cobalt-polytetrafluoroethylene mixed plating solution.
< method for producing plating layer >
The invention also provides a preparation method of the plating layer, which comprises the following steps: the plating layer is prepared by the nickel-cobalt-polytetrafluoroethylene mixed plating solution.
In a preferred embodiment of the present invention, the method comprises: the plating layer is prepared by electroplating the nickel-cobalt-polytetrafluoroethylene mixed plating solution.
In a preferred embodiment of the present invention, the method comprises the steps of:
1) preparing a nickel-cobalt-polytetrafluoroethylene mixed plating solution;
2) electroplating by using the element to be plated as a cathode plate and pure nickel (the purity is more than or equal to 99.9%) as an anode plate.
In a preferred embodiment of the present invention, the temperature of the electroplating is 40-70 ℃; the electroplating time is 10min-2h, and further, the plating layers with different thicknesses can be obtained by regulating and controlling the electroplating time.
In a preferred embodiment of the present invention, the electroplating is direct current electroplating with a current density of 2-6A/dm2。
In a preferred embodiment of the invention, the material of the component to be coated is a steel substrate, for example carbon steel or alloy steel.
In a preferred embodiment of the present invention, the electroplating process is performed by stirring, for example, a mixing stirring manner of one or two or more of mechanical stirring, ultrasonic stirring, and magnetic stirring. Preferably, the stirring mode is a combination of mechanical stirring and ultrasonic stirring, wherein the rotation speed of the mechanical stirring is 120-180r/min, and the frequency of the ultrasonic stirring is 55-75 Hz.
In the invention, in the electroplating process, along with the mixed deposition of nickel-cobalt metal ions, the polytetrafluoroethylene ultrafine powder suspended in the mixed plating solution is subjected to codeposition on the surface of an element to be plated under the combined action of an electric field and electrophoresis, so that a nickel-cobalt-polytetrafluoroethylene mixed plating layer is obtained.
< needle winding >
The invention also provides a winding needle, which comprises a winding needle substrate and a plating layer on the surface of the winding needle substrate, wherein the plating layer is the plating layer.
In a preferred embodiment of the present invention, the material of the needle winding substrate is a steel substrate, a titanium substrate, or a tungsten substrate, and preferably, a steel carbon steel or alloy steel.
< method for producing needle winding >
The invention also provides a preparation method of the winding needle, which comprises the step of preparing a plating layer on the surface of the winding needle substrate through the nickel-cobalt-polytetrafluoroethylene mixed plating solution on the winding needle substrate.
In a preferred embodiment of the present invention, the method comprises the steps of:
1) preparing a nickel-cobalt-polytetrafluoroethylene mixed plating solution;
2) electroplating with the winding needle substrate as the cathode plate and pure nickel (purity is greater than or equal to 99.9%) as the anode plate.
In a preferred embodiment of the present invention, the temperature of the electroplating is 40-70 ℃; the electroplating time is 10min-2 h.
In a preferred embodiment of the present invention, the electroplating is direct current electroplating with a current density of 2-6A/dm2。
In a preferred embodiment of the present invention, the electroplating process is performed by stirring, for example, a mixing stirring manner of one or two or more of mechanical stirring, ultrasonic stirring, and magnetic stirring. Preferably, the stirring mode is a combination of mechanical stirring and ultrasonic stirring, wherein the rotation speed of the mechanical stirring is 120-180r/min, and the frequency of the ultrasonic stirring is 55-75 Hz.
The preparation method of the present invention will be described in further detail with reference to specific examples. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.
Example 1
Preparing 5L of nickel-cobalt-polytetrafluoroethylene mixed plating solution, wherein the solvent in the mixed plating solution is water, and the mixed plating solution further comprises the following substances: 300g/L of nickel sulfate, 40g/L of cobalt sulfate, 5g/L of polytetrafluoroethylene with the particle size of 0.05 mu m, 25g/L of buffering agent, 10mL/L of brightening agent and 0.5g/L of surfactant, wherein the buffering agent is boric acid, the brightening agent is a mixed solution of 5g of o-benzoylsulfimide, 0.8g of dihydroxy dimethyl acetylene and 100mL of sodium vinyl sulfonate, and the surfactant is sodium dodecyl sulfonate; the pH of the mixed plating solution is 3.5;
preparing a plating layer: taking a high-carbon high-chromium alloy steel coil needle as a cathode plate, taking the high-carbon high-chromium alloy steel coil needle as an anode plate, taking pure nickel (the purity is more than or equal to 99.9%) as the cathode plate, taking the high-carbon high-chromium alloy steel coil needle as the anode plate2The electroplating process adopts 120r/min mechanical stirring and 55Hz ultrasonic stirring, and the electroplating time is 30 min.
Example 2
Preparing 5L of nickel-cobalt-polytetrafluoroethylene mixed plating solution, wherein the solvent in the mixed plating solution is water, and the mixed plating solution further comprises the following substances: 200g/L of nickel sulfate, 40g/L of nickel chloride, 50g/L of cobalt sulfate, 8g/L of polytetrafluoroethylene with the particle size of 0.08 mu m, 15g/L of buffering agent, 15mL/L of brightening agent and 1.0g/L of surfactant, wherein the buffering agent is phosphoric acid, the brightening agent is a mixed solution of 10g of o-benzoylsulfimide, 3g of dihydroxy dimethyl acetylene and 150mL of sodium vinyl sulfonate, and the surfactant is sodium dodecyl sulfonate; the pH of the mixed plating solution is 4.0;
preparing a plating layer: taking a high-carbon high-chromium alloy steel coil needle as a cathode plate, a pure nickel (purity is more than or equal to 99.9%) plate with the size of 245mm length 8.5mm width 8mm thickness as an anode plate, the size of 255mm 10mm width 8mm thickness, the temperature of the electroplating process is 60 ℃, and the current density is 5A/dm2Mechanical stirring at 150r/min and ultrasonic stirring at 60Hz for 30 min.
Example 3
Preparing 5L of nickel-cobalt-polytetrafluoroethylene mixed plating solution, wherein the solvent in the mixed plating solution is water, and the mixed plating solution further comprises the following substances: 150g/L of nickel sulfate, 80g/L of nickel chloride, 15g/L of cobalt sulfate, 10g/L of polytetrafluoroethylene with the particle size of 0.5 mu m, 15g/L of buffering agent, 15mL/L of brightening agent and 1.0g/L of surfactant, wherein the buffering agent is a mixture of acetic acid and malic acid (the mixing ratio is 1:1), the brightening agent is a mixed solution of 15g of o-benzoylsulfimide, 1.5g of dihydroxy dimethyl acetylene and 150mL of sodium vinyl sulfonate, and the surfactant is polyethylene glycol; the pH of the mixed plating solution is 4.5;
preparing a plating layer: taking a high-carbon high-chromium alloy steel coil needle as a cathode plate, a pure nickel (the purity is more than or equal to 99.9%) plate with the size of 245mm length 8.5mm width 8mm thickness as an anode plate, the size of 255mm 10mm width 8mm thickness, the temperature of the electroplating process is 60 ℃, and the current density is 6A/dm2Mechanical stirring at 180r/min and ultrasonic stirring at 65Hz for 30 min.
Comparative example 1
A high-carbon high-chromium alloy steel coil needle is taken, the size of the high-carbon high-chromium alloy steel coil needle is 245mm long by 8.5mm wide by 8mm thick, and no treatment is carried out.
Comparative example 2
A high-carbon high-chromium alloy steel coil needle is taken, the size of the high-carbon high-chromium alloy steel coil needle is 245mm long by 8.5mm wide by 8mm thick, and a Teflon layer with the thickness of 0.08mm is attached to the surface of the coil needle.
Test example 1
The hardness of the needles obtained in examples 1 to 3 and comparative examples 1 to 2 was measured as follows:
the press-in hardness is adopted to measure the ability of the local hard object resistance of the plating layer to press in the surface, the Vickers hardness is adopted to represent the hardness value HV, and the Vickers hardness of the plating layer is measured by a microhardness meter, wherein the Vickers hardness meter is a diamond regular rectangular pyramid pressure head with an included angle of 136 degrees between two surfaces, the load force is 100g, the loading time is 15s, and the test result is shown in Table 1.
Test example 2
The friction coefficient test was carried out on the winding needles obtained in examples 1 to 3 and comparative examples 1 to 2, according to the following procedure:
the friction coefficient refers to the ratio of the friction force and the positive pressure when the surfaces of two objects move relatively. The specific operating conditions for testing the friction coefficient by using the friction tester are as follows: horizontally placing a sample to be tested on a platform to be tested of a friction tester, and adopting a slide block (the area is 50 cm) with the weight of 500g2The bottom surface reference GB10006 requires a thin layer of elastic felt to cover) to carry out back and forth traction movement on the surface of the sample to be tested at the speed of 200mm/min, the test is carried out for 10min, and the friction coefficient is output. Each sample was tested in triplicate and the average was taken as the final test result, as shown in table 1.
Test example 3
The needles obtained in examples 1 to 3 and comparative examples 1 to 2 were subjected to abrasion loss test in the following procedure:
the wear resistance of a material can be expressed by the amount of wear, the greater the amount of wear, the poorer the wear resistance, and conversely, the better the wear resistance. The abrasion loss refers to material loss caused by a friction process, and can be well used for expressing the abrasion resistance of the mixed coating. The wear resistance of the composite coating is quantitatively characterized by adopting a wear measuring instrument, under the condition of a steel ball with the load of 500g (the steel ball meeting the GB4208-2008 standard requirement), a back-and-forth friction test is carried out on the surface of a final product of the steel plate for 30min at the speed of 100r/min, the wear loss is expressed by calculating the weight difference before and after wear, and the test result is shown in Table 1.
TABLE 1 test results of the needle-winding plating obtained in examples 1 to 3 and comparative examples 1 to 2
| Group of | Hardness (HV) | Coefficient of friction | Abrasion loss/mg |
| Example 1 | 625 | 0.408 | 0.78 |
| Example 2 | 578 | 0.295 | 0.96 |
| Example 3 | 565 | 0.218 | 1.06 |
| Comparative example 1 | 780 | 0.741 | 0.55 |
| Comparative example 2 | 12 | 0.112 | 11.52 |
From the above test results-it can be seen that: comparative example 2 a layer of teflon tape (polytetrafluoroethylene) was attached to the surface of the winding needle, the hardness of which was much lower than that of examples 1-3; the hardness represents the electroplating compactness of the plating layer on the surface of the original steel plate: high hardness, high compactness and low abrasion loss. By combining the comparative analysis of the abrasion loss of each example, the abrasion loss of the comparative example 2 only attached with Teflon is the largest, the abrasion loss of the examples 1 to 3 is very low, and the service life of the winding needle can be well prolonged by adopting the high-abrasion-resistance anti-static winding needle.
The friction coefficients of the embodiments 1 to 3 of the invention are all smaller than those of a pure metal steel plate winding needle (comparative example 1), the smaller the friction coefficient of the winding needle is, the smaller the friction force of the winding process and the diaphragm is, and the winding needle can be better extracted from the battery cell after winding is finished, thereby avoiding the situation that the diaphragm or the pole piece of the battery cell is damaged due to large friction resistance, and improving the overall yield of the battery cell.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A coating, wherein the coating comprises nickel, cobalt and polytetrafluoroethylene.
2. The coating of claim 1 wherein said nickel and said cobalt are present in the form of a nickel-cobalt alloy, said polytetrafluoroethylene being dispersed in the nickel-cobalt alloy.
3. The plating layer of claim 2, wherein the mass ratio of the nickel-cobalt alloy to the polytetrafluoroethylene is from 100:5 to 100: 30.
4. The coating of any one of claims 1 to 3 wherein the mass ratio of nickel to cobalt is from 50:1 to 5: 1.
5. The coating as claimed in any one of claims 1 to 4, wherein the coating has a Vickers hardness HV of 450 or more; and/or the friction coefficient of the coating is less than or equal to 0.5; and/or the abrasion loss of the plating layer is less than or equal to 2.5 mg/h.
6. The method of preparing a coating as claimed in any one of claims 1 to 5, wherein the method comprises the steps of:
electroplating a nickel-cobalt-polytetrafluoroethylene mixed plating solution to prepare the plating layer;
wherein, the nickel-cobalt-polytetrafluoroethylene mixed plating solution comprises water, nickel salt, cobalt salt and polytetrafluoroethylene.
7. The production method according to claim 6, wherein the nickel-cobalt-polytetrafluoroethylene mixed plating solution further comprises one, two or more of a buffer, a brightener and a surfactant.
8. The preparation method according to claim 6 or 7, wherein the nickel salt is selected from one or two of nickel sulfate and nickel chloride, and the addition amount of the nickel salt is 180-350 g/L; the cobalt salt is selected from one or two of cobalt chloride and cobalt sulfate, and the addition amount of the cobalt salt is 5-50 g/L; the particle size of the polytetrafluoroethylene is 0.05-5 mu m, and the addition amount of the polytetrafluoroethylene is 3-20 g/L.
9. The production method according to any one of claims 6 to 8, wherein the temperature of the plating is 40 to 70 ℃; the electroplating time is 10min-2 h; the electroplating is direct current electroplating with current density of 2-6A/dm2。
10. A winding needle, comprising a winding needle substrate and a coating on the surface of the winding needle substrate, wherein the coating is the coating of any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010457742.2A CN111621820A (en) | 2020-05-26 | 2020-05-26 | High-wear-resistance anti-static winding needle and preparation method thereof |
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| CN114959811A (en) * | 2022-05-31 | 2022-08-30 | 暨南大学 | High-corrosion-resistance composite electroplating electrolyte and preparation method of coating thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114959811A (en) * | 2022-05-31 | 2022-08-30 | 暨南大学 | High-corrosion-resistance composite electroplating electrolyte and preparation method of coating thereof |
| CN114959811B (en) * | 2022-05-31 | 2023-08-15 | 暨南大学 | High corrosion-resistant composite electroplating electrolyte and preparation method of plating layer thereof |
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