A nickel-coated graphene and its preparation method

Abstract

The present invention belongs to the technical field of composite materials, and particularly relates to nickel-coated graphene and a preparation method thereof; the raw materials of the nickel-coated graphene comprise the following components: 30-80 parts of graphene, 7.5-20 parts of inorganic acid, 200-500 parts of nickel salt, 200-500 parts of complexing agent, 200-500 parts of carboxyl compound, 10-30 parts of reducing agent, 5-40 parts of stabilizer, and 0.5-10 parts of accelerator; the nickel-coated graphene prepared by the method of the present invention has the dual characteristics of low density and conductive shielding. The nickel-coated graphene prepared by the method of the present invention expands the application fields of graphene; the nickel-coated graphene prepared by the method of the present invention greatly reduces the application cost while improving the conductive shielding property of the product and improves the performance of the product; the nickel-coated graphene prepared by the method of the present invention has high stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite materials, and particularly relates to a nickel-coated graphene and a preparation method thereof. Background Art

[0002] With the progress of technology, the application of conductive and heat-conductive materials in the fields of electronics, technology, communication, military industry, etc. is increasing, and graphene has also been applied in the above fields. However, due to the high cost of graphene, its practical application fields are limited.

[0003] Chinese Patent CN201410246298.4 discloses a copper composite conductive powder coated with a carbon layer of graphene structure and a preparation method thereof, which requires a reaction at a high temperature above 100°C. The resistance of the copper-coated graphene reaches several hundred ohms, which does not meet the application requirements of conductive powder in 5G technology.

[0004] Preparing a nickel-coated graphene material with reduced application cost, low resistance, and high electromagnetic shielding performance is a technical problem to be solved at present. Summary of the Invention

[0005] To solve the above problems, the present invention provides a nickel-coated graphene. By weight, the raw materials include the following components: 30-80 parts of graphene, 200-500 parts of nickel salt, 200-500 parts of complexing agent, 200-500 parts of carboxyl compound, 10-30 parts of reducing agent, 5-40 parts of stabilizer, and 0.5-10 parts of accelerator.

[0006] Preferably, the graphene is selected from one or more of graphene oxide, fluorinated graphene, brominated graphene, reduced graphene oxide, chlorinated graphene, nitrogenated graphene, iodinated graphene, doped graphene, and hydrogenated graphene.

[0007] Preferably, the weight ratio of the nickel salt to the complexing agent is 1:(0.8-1.4).

[0008] Preferably, the weight ratio of the nickel salt to the complexing agent is 1:(0.9-1.2).

[0009] Preferably, the nickel salt is selected from one or more of nickel nitrate, nickel chloride, nickel sulfate, nickel oxalate, and nickel bromide.

[0010] Preferably, the complexing agent is selected from one or more of sodium EDTA, potassium sodium tartrate, sodium hydroxyethylidene diphosphonate, and sodium ethylenediaminetetramethylenephosphonate.

[0011] Preferably, the reducing agent is a nitrogen-containing compound.

[0012] Preferably, the stabilizer is a sulfur-containing compound.

[0013] Preferably, the sulfur-containing compound is selected from one or more of sodium bisulfite, thiourea, allylthiourea, sodium sulfide, and sodium sulfite.

[0014] The second aspect of the present invention provides a method for preparing nickel-coated graphene, comprising the following steps:

[0015] S1. Perform surface treatment on graphene;

[0016] S2. Add nickel salt, complexing agent, carboxyl compound, stabilizer, and promoter into a reaction kettle;

[0017] S3. Raise the temperature of the reaction kettle and add carboxyl compound and nickel salt solution;

[0018] S4. Add the graphene treated in S1 into the reaction kettle, and add stabilizer and promoter;

[0019] S5. Add a reducing agent into the reaction kettle and stir for 0.1 - 5 h;

[0020] S6. Filter and dry the solution to obtain nickel-coated graphene.

[0021] Beneficial effects

[0022] 1. The nickel-coated graphene prepared by the method of the present invention has the dual characteristics of low density and conductive shielding.

[0023] 2. The nickel-coated graphene prepared by the method of the present invention expands the application fields of graphene.

[0024] 3. The nickel-coated graphene prepared by the method of the present invention greatly reduces the application cost while improving the conductive shielding property of the product, and improves the performance of the product.

[0025] 4. The nickel-coated graphene prepared by the method of the present invention has high stability. Specific embodiments

[0026] The following further clearly and completely describes the technical features in the technical solutions provided by the present invention in conjunction with specific embodiments, which is not a limitation on its protection scope.

[0027] The terms "preferred", "more preferred", etc. in the present invention refer to the embodiments of the present invention that can provide certain beneficial effects under certain circumstances. However, under the same circumstances or other circumstances, other embodiments may also be preferred. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not available, nor is it intended to exclude other embodiments from the scope of the present invention.

[0028] A nickel-coated graphene, by weight, the raw materials include the following components: 30-80 parts of graphene, 200-500 parts of nickel salt, 200-500 parts of complexing agent, 200-500 parts of carboxyl compound, 10-30 parts of reducing agent, 5-40 parts of stabilizer, and 0.5-10 parts of accelerator.

[0029] In one embodiment, the graphene is selected from one or more of graphene oxide, fluorinated graphene, brominated graphene, reduced graphene oxide, chlorinated graphene, graphene nitride, iodinated graphene, doped graphene, and hydrogenated graphene.

[0030] In one embodiment, the graphene is reduced graphene oxide.

[0031] In one embodiment, the particle size of the reduced graphene oxide is 5-20 μm.

[0032] In one embodiment, the particle size of the reduced graphene oxide is 13 μm.

[0033] In one embodiment, the manufacturer of the reduced graphene oxide is Henan Liugong Graphite Co., Ltd., and the model is LG-5901.

[0034] In one embodiment, the weight ratio of the nickel salt to the complexing agent is 1:(0.8-1.4).

[0035] In one embodiment, the weight ratio of the nickel salt to the complexing agent is 1:(0.9-1.2).

[0036] The inventors of this application unexpectedly found in experiments that when the weight ratio of the nickel salt to the complexing agent is 1:(0.8-1.4), the deposition rate and deposition effect of nickel plating on the surface of graphene in the nickel plating solution are relatively good, the copper-nickel layer is uniform, the resistance value of the nickel-coated graphene is low, and the electromagnetic shielding value is high.

[0037] In one embodiment, the nickel salt is selected from one or more of nickel nitrate, nickel chloride, nickel sulfate, nickel oxalate, and nickel bromide.

[0038] In one embodiment, the nickel salt is nickel sulfate.

[0039] In one embodiment, the manufacturer of the nickel sulfate is Shandong Liong New Material Technology Co., Ltd., and the model is LA-5V.

[0040] In one embodiment, the complexing agent is selected from one or more of sodium EDTA, potassium sodium tartrate, sodium hydroxyethylidene diphosphonate, and sodium ethylenediaminetetramethylenephosphonate.

[0041] In one embodiment, the complexing agent is potassium sodium tartrate.

[0042] In one embodiment, the potassium sodium tartrate is purchased from Jiangsu Caiwei Biotechnology Co., Ltd., and the mass content is 99%.

[0043] In one embodiment, the reducing agent is a nitrogen-containing compound.

[0044] In one embodiment, the nitrogen-containing compound is hydrazine hydrate.

[0045] In one embodiment, the hydrazine hydrate contains an 85% aqueous solution, and the CAS number is 10217-52-4.

[0046] In one embodiment, the stabilizer is a sulfur-containing compound.

[0047] In one embodiment, the sulfur-containing compound is selected from one or more of sodium bisulfite, thiourea, allylthiourea, sodium sulfide, and sodium sulfite.

[0048] In one embodiment, the sulfur-containing compound is thiourea.

[0049] In one embodiment, the thiourea is purchased from Shandong Changyao New Materials Co., Ltd., and the model is cy-845120.

[0050] In one embodiment, the carboxyl compound is a hydroxy acid.

[0051] In one embodiment, the hydroxy acid is selected from one or more of malic acid, citric acid, and tartaric acid.

[0052] In one embodiment, the tartaric acid is purchased from Guangzhou Sanchang Chemical Industry Co., Ltd., and the type is DL-tartaric acid.

[0053] In one embodiment, the accelerator is an inorganic salt.

[0054] In one embodiment, the inorganic salt is selected from one or more of calcium salts, potassium salts, sodium salts, chloride salts, and magnesium salts.

[0055] In one embodiment, the sodium salt is selected from one or more of sodium chloride, sodium sulfate, sodium thiosulfate, sodium carbonate, sodium bicarbonate, sodium fluoride, and sodium nitrate.

[0056] In one embodiment, the sodium fluoride is purchased from Shandong Liong New Materials Technology Co., Ltd., and the mass content is 99%.

[0057] The second aspect of the present invention provides a method for preparing nickel-coated graphene, which includes the following steps:

[0058] S1. Perform surface treatment on graphene;

[0059] S2. Add nickel salt, complexing agent, carboxyl compound, stabilizer, and promoter into the reaction kettle.

[0060] S3. Raise the temperature of the reaction kettle, and add carboxyl compound and nickel salt solution.

[0061] S4. Add the graphene treated in S1 into the reaction kettle, and add stabilizer and promoter.

[0062] S5. Add the reducing agent into the reaction kettle and stir for 0.1 - 5 h.

[0063] S6. Filter and dry the solution to obtain nickel-coated graphene.

[0064] In one embodiment, the preparation method of the nickel-coated graphene includes the following steps:

[0065] S1. Rinse and filter graphene with inorganic acid and water.

[0066] S2. Add nickel salt, complexing agent, carboxyl compound, stabilizer, and promoter into the reaction kettle.

[0067] S3. Raise the temperature of the reaction kettle, and add carboxyl compound and nickel salt solution.

[0068] S4. Add ammonia water into the reaction kettle, add the graphene filtered in S1, and add stabilizer and promoter.

[0069] S5. Add the reducing agent into the reaction kettle and stir for 0.1 - 5 h.

[0070] S6. Filter and dry the solution to obtain nickel-coated graphene.

[0071] In a preferred embodiment, the preparation method of the nickel-coated graphene includes the following steps:

[0072] S1. Add graphene into a container, rinse and filter it with hydrochloric acid; then rinse graphene with nitric acid, wash and filter it with distilled water.

[0073] S2. Add nickel salt, complexing agent, carboxyl compound, stabilizer, and promoter into the reaction kettle.

[0074] S3. Raise the temperature of the reaction kettle to 65 - 75 °C, and add carboxyl compound and nickel salt solution.

[0075] S4. Add ammonia water into the reaction kettle to adjust the pH to 8, add the graphene filtered in S1, and add stabilizer and promoter.

[0076] S5. Add the reducing agent into the reaction kettle and stir for 0.1 - 5 h.

[0077] S6. Filter and dry the solution to obtain nickel-coated graphene.

[0078] Example

[0079] Example 1

[0080] A kind of nickel-coated graphene, by weight, the raw materials include the following components: 50 parts of graphene, 350 parts of nickel sulfate, 350 parts of sodium potassium tartrate, 30 parts of tartaric acid, 300 parts of citric acid, 15 parts of hydrazine hydrate, 20 parts of thiourea, and 5 parts of sodium fluoride.

[0081] A preparation method of nickel-coated graphene includes the following steps:

[0082] S1. Add 50 parts of reduced graphene oxide to a container, wash it with 100 ml of hydrochloric acid with a mass fraction of 20% for 30 min, then rinse it 3 times with 500 ml of distilled water and filter to obtain graphene;

[0083] S2. Add 150 ml of nitric acid with a mass fraction of 5% to the graphene, let it stand for 30 min, then wash the graphene with distilled water until it is neutral and filter for use.

[0084] S3. Add 15 L of distilled water to the reaction kettle, add 300 parts of nickel sulfate, 350 parts of sodium potassium tartrate, 300 parts of citric acid, 20 parts of thiourea, and 5 parts of sodium fluoride to the reaction kettle and stir for 10 min;

[0085] S4. Raise the temperature of the reaction kettle to 70 °C, add 30 parts of tartaric acid and stir for 10 min, then add 300 parts of citric acid and 50 parts of nickel sulfate and stir for 30 min;

[0086] S5. Add ammonia water to the reaction kettle to adjust the pH to 8, add the graphene filtered in S2, add 20 parts of thiourea and 5 parts of sodium fluoride and stir for 20 min;

[0087] S6. Add 15 parts of hydrazine hydrate to the reaction kettle and stir for 2 h;

[0088] S7. Filter and dry the solution to obtain nickel-coated graphene.

[0089] The graphene is reduced graphene oxide with a particle size of 13 um.

[0090] The manufacturer of the purchased reduced graphene oxide is Henan Liugong Graphite Co., Ltd., and the model is LG-5901.

[0091] The manufacturer of the purchased nickel sulfate is Shandong Liong New Material Technology Co., Ltd., and the model is LA-5V.

[0092] The manufacturer of the purchased sodium potassium tartrate is Jiangsu Caiwei Biotechnology Co., Ltd., and the mass content is 99%.

[0093] The manufacturer from which the tartaric acid is purchased is Guangzhou Sanchang Chemical Co., Ltd., and the type is DL-tartaric acid.

[0094] The manufacturer from which the thiourea is purchased is Shandong Changyao New Materials Co., Ltd., and the model is cy-845120.

[0095] The hydrazine hydrate contains an 85% aqueous solution, and the CAS number is 10217-52-4.

[0096] The manufacturer from which the sodium fluoride is purchased is Shandong Liong New Materials Technology Co., Ltd., and the mass content is 99%.

[0097] Example 2

[0098] A nickel-coated graphene, by weight, the raw materials comprise the following components: 50 parts of graphene, 350 parts of nickel sulfate, 280 parts of potassium sodium tartrate, 30 parts of tartaric acid, 300 parts of citric acid, 15 parts of hydrazine hydrate, 20 parts of thiourea, and 5 parts of sodium fluoride.

[0099] A preparation method of nickel-coated graphene comprises the following steps:

[0100] S1. Add 50 parts of reduced graphene oxide to a container, wash with 100 ml of hydrochloric acid with a mass fraction of 20% for 30 min, and then rinse with 500 ml of distilled water 3 times and filter to obtain graphene;

[0101] S2. Add 150 ml of nitric acid with a mass fraction of 7% to the graphene, let it stand for 30 min, then wash the graphene with distilled water until it is neutral and filter for use.

[0102] S3. Add 15 L of distilled water to a reaction kettle, add 300 parts of nickel sulfate, 280 parts of potassium sodium tartrate, 300 parts of citric acid, 20 parts of thiourea, and 5 parts of sodium fluoride to the reaction kettle and stir for 10 min;

[0103] S4. Raise the temperature of the reaction kettle to 70 °C, add 30 parts of tartaric acid and stir for 10 min, then add 300 parts of citric acid and 50 parts of nickel sulfate and stir for 30 min;

[0104] S5. Add ammonia water to the reaction kettle to adjust the pH to 8, add the graphene filtered in S2, add 20 parts of thiourea and 5 parts of sodium fluoride and stir for 20 min;

[0105] S6. Add 15 parts of hydrazine hydrate to the reaction kettle and stir for 2 h;

[0106] S7. Filter and dry the solution to obtain nickel-coated graphene.

[0107] The graphene is reduced graphene oxide, and the particle size is 13 um.

[0108] The purchased manufacturer of the reduced graphene oxide is Henan Liugong Graphite Co., Ltd., and the model is LG-5901.

[0109] The purchased manufacturer of the nickel sulfate is Shandong Liong New Material Technology Co., Ltd., and the model is LA-5V.

[0110] The purchased manufacturer of the potassium sodium tartrate is Jiangsu Caiwei Biotechnology Co., Ltd., and the mass content is 99%.

[0111] The purchased manufacturer of the tartaric acid is Guangzhou Sanchang Chemical Industry Co., Ltd., and the type is DL-tartaric acid.

[0112] The purchased manufacturer of the thiourea is Shandong Changyao New Material Co., Ltd., and the model is cy-845120.

[0113] The hydrazine hydrate contains an 85% aqueous solution, and the CAS number is 10217-52-4.

[0114] The purchased manufacturer of the sodium fluoride is Shandong Liong New Material Technology Co., Ltd., and the mass content is 99%.

[0115] Example 3

[0116] A nickel-coated graphene, calculated by weight, the raw materials comprise the following components: 50 parts of graphene, 350 parts of nickel sulfate, 400 parts of potassium sodium tartrate, 30 parts of tartaric acid, 300 parts of citric acid, 15 parts of hydrazine hydrate, 20 parts of thiourea, and 5 parts of sodium fluoride.

[0117] A preparation method of the nickel-coated graphene comprises the following steps:

[0118] S1. Add 50 parts of reduced graphene oxide into a container, wash it with 100 ml of hydrochloric acid with a mass fraction of 20% for 30 min, and then rinse it 3 times with 500 ml of distilled water and filter to obtain graphene;

[0119] S2. Add 150 ml of nitric acid with a mass fraction of 7% into the graphene, let it stand for 30 min, and then wash the graphene with distilled water until it is neutral and filter for use.

[0120] S3. Add 15 L of distilled water into a reaction kettle, add 300 parts of nickel sulfate, 400 parts of potassium sodium tartrate, 300 parts of citric acid, 20 parts of thiourea, and 5 parts of sodium fluoride into the reaction kettle and stir for 10 min;

[0121] S4. Raise the temperature of the reaction kettle to 70 °C, add 30 parts of tartaric acid and stir for 10 min, then add 300 parts of citric acid and 50 parts of nickel sulfate and stir for 30 min;

[0122] S5. Add ammonia water to the reaction kettle to adjust the pH to 8, add the graphene filtered in S2, add 20 parts of thiourea and 5 parts of sodium fluoride, and stir for 20 min;

[0123] S6. Add 15 parts of hydrazine hydrate to the reaction kettle and stir for 2 h;

[0124] S7. Filter and dry the solution to obtain nickel-coated graphene.

[0125] The graphene is reduced graphene oxide with a particle size of 13 um.

[0126] The manufacturer of the reduced graphene oxide is Henan Liugong Graphite Co., Ltd., and the model is LG-5901.

[0127] The manufacturer of the nickel sulfate is Shandong Liong New Material Technology Co., Ltd., and the model is LA-5V.

[0128] The manufacturer of the potassium sodium tartrate is Jiangsu Caiwei Biotechnology Co., Ltd., and the mass content is 99%.

[0129] The manufacturer of the tartaric acid is Guangzhou Sanchang Chemical Industry Co., Ltd., and the type is DL-tartaric acid.

[0130] The manufacturer of the thiourea is Shandong Changyao New Material Co., Ltd., and the model is cy-845120.

[0131] The hydrazine hydrate contains an 85% aqueous solution, and the CAS number is 10217-52-4.

[0132] The manufacturer of the sodium fluoride is Shandong Liong New Material Technology Co., Ltd., and the mass content is 99%.

[0133] Example 4

[0134] A kind of nickel-coated graphene, by weight, the raw materials comprise the following components: 50 parts of graphene, 350 parts of nickel sulfate, 350 parts of potassium sodium tartrate, 30 parts of tartaric acid, 300 parts of citric acid, 15 parts of hydrazine hydrate, 20 parts of thiourea, and 5 parts of sodium sulfate.

[0135] A preparation method of nickel-coated graphene comprises the following steps:

[0136] S1. Add 50 parts of reduced graphene oxide to the container, wash with 100 ml of hydrochloric acid with a mass fraction of 20% for 30 min, then rinse with 500 ml of distilled water 3 times and filter to obtain graphene;

[0137] S2. Add 150 ml of nitric acid with a mass fraction of 7% to the graphene, let it stand for 30 min, then wash the graphene with distilled water until it is neutral and filter for use.

[0138] S3. Add 15 L of distilled water to the reaction kettle, and add 300 parts of nickel sulfate, 350 parts of potassium sodium tartrate, 300 parts of citric acid, 20 parts of thiourea, and 5 parts of sodium fluoride to the reaction kettle and stir for 10 min;

[0139] S4. Raise the temperature of the reaction kettle to 70 °C, add 30 parts of tartaric acid and stir for 10 min, then add 300 parts of citric acid and 50 parts of nickel sulfate and stir for 30 min;

[0140] S5. Add ammonia water to the reaction kettle to adjust the pH to 8, add the graphene filtered in S2, add 20 parts of thiourea and 5 parts of sodium sulfate and stir for 20 min;

[0141] S6. Add 15 parts of hydrazine hydrate to the reaction kettle and stir for 2 h;

[0142] S7. Filter and dry the solution to obtain nickel-coated graphene.

[0143] The manufacturer of the sodium sulfate is Jinan Huijinchuan Chemical Co., Ltd., and the mass content is 99%.

[0144] The graphene is reduced graphene oxide with a particle size of 13 um.

[0145] The manufacturer of the reduced graphene oxide is Henan Liugong Graphite Co., Ltd., and the model is LG-5901.

[0146] The manufacturer of the nickel sulfate is Shandong Liong New Material Technology Co., Ltd., and the model is LA-5V.

[0147] The manufacturer of the potassium sodium tartrate is Jiangsu Caiwei Biotechnology Co., Ltd., and the mass content is 99%.

[0148] The manufacturer of the tartaric acid is Guangzhou Sanchang Chemical Co., Ltd., and the type is DL-tartaric acid.

[0149] The manufacturer of the thiourea is Shandong Changyao New Material Co., Ltd., and the model is cy-845120.

[0150] The hydrazine hydrate contains 85% aqueous solution, and the CAS number is 10217-52-4.

[0151] Example 5

[0152] A kind of nickel-coated graphene, by weight, the raw materials comprise the following components: 50 parts of graphene, 10 parts of hydrochloric acid, 2.5 parts of nitric acid, 400 parts of nickel sulfate, 350 parts of potassium sodium tartrate, 30 parts of tartaric acid, 300 parts of citric acid, 15 parts of hydrazine hydrate, 20 parts of thiourea, and 5 parts of sodium fluoride.

[0153] A preparation method of nickel-coated graphene comprises the following steps:

[0154] S1. Add 50 parts of reduced graphene oxide to a container, wash it with 100 ml of hydrochloric acid with a mass fraction of 20% for 30 min, then rinse it 3 times with 500 ml of distilled water and filter to obtain graphene;

[0155] S2. Add 150 ml of nitric acid with a mass fraction of 7% to the graphene, let it stand for 30 min, then wash the graphene with distilled water until it is neutral and filter for use.

[0156] S3. Add 15 L of distilled water to a reaction kettle, add 300 parts of nickel sulfate, 350 parts of potassium sodium tartrate, 300 parts of citric acid, 20 parts of thiourea, and 5 parts of sodium fluoride to the reaction kettle and stir for 10 min;

[0157] S4. Raise the temperature of the reaction kettle to 70 °C, add 30 parts of tartaric acid and stir for 10 min, then add 300 parts of citric acid and 100 parts of nickel sulfate and stir for 30 min;

[0158] S5. Add ammonia water to the reaction kettle to adjust the pH to 8, add the graphene filtered in S2, add 20 parts of thiourea and 5 parts of sodium fluoride and stir for 20 min;

[0159] S6. Add 15 parts of hydrazine hydrate to the reaction kettle and stir for 2 h;

[0160] S7. Filter and dry the solution to obtain nickel-coated graphene.

[0161] The graphene is reduced graphene oxide with a particle size of 13 μm.

[0162] The manufacturer of the reduced graphene oxide purchased is Henan Liugong Graphite Co., Ltd., and the model is LG-5901.

[0163] The manufacturer of the nickel sulfate purchased is Shandong Liong New Material Technology Co., Ltd., and the model is LA-5V.

[0164] The manufacturer of the potassium sodium tartrate purchased is Jiangsu Caiwei Biotechnology Co., Ltd., and the mass content is 99%.

[0165] The manufacturer of the tartaric acid purchased is Guangzhou Sanchang Chemical Industry Co., Ltd., and the type is DL-tartaric acid.

[0166] The manufacturer of the thiourea purchased is Shandong Changyao New Material Co., Ltd., and the model is cy-845120.

[0167] The hydrazine hydrate contains an 85% aqueous solution, and the CAS number is 10217-52-4.

[0168] The manufacturer of the sodium fluoride purchased is Shandong Liong New Material Technology Co., Ltd., and the mass content is 99%.

[0169] Performance Test

[0170] The sample preparation method is to weigh 1 g of nickel-coated graphene prepared in Examples 1-5, add it to 100 g of acrylic glue, stir evenly, coat it on the release paper using an applicator, and take it out after putting it in an oven at 110 °C for 3 min; stick the dried glue on the aluminum foil and roll it 3 times with a 2 kg roller; uncover the release paper and measure the thickness of the dry glue to be 20 μm; stick the aluminized paper with glue on two copper blocks of 40 mm × 40 mm with a spacing of 40 mm to obtain the test sample, and the test results are shown in Table 1.

[0171] 1. Measuring the resistance value

[0172] Test method: Using the test samples prepared in Examples 1-5, measure the resistance value with a resistance tester.

[0173] 2. Measuring the electromagnetic shielding value

[0174] Test method: Using the test samples prepared in Examples 1-5, measure the electromagnetic shielding value with an electromagnetic shielding effectiveness test device.

[0175] Table 1

[0176]

[0177]

[0178] The foregoing example embodiments are illustrative only and are used to explain some features of the method of the present invention. The appended claims are intended to claim the broadest scope possible, and the embodiments presented herein are merely illustrative of selected embodiments according to the combination of all possible embodiments. Therefore, the applicant's intention is that the appended claims are not limited by the selection of examples that illustrate the features of the present invention. Some numerical ranges used in the claims also include sub-ranges within them, and variations within these ranges should also be interpreted as being covered by the appended claims where possible.

Claims

1. A nickel-coated graphene, characterized in that, By weight, the raw materials comprise the following components: 30 - 80 parts of graphene, 200 - 500 parts of nickel salt, 200 - 500 parts of complexing agent, 200 - 500 parts of carboxyl compound, 10 - 30 parts of reducing agent, 5 - 40 parts of stabilizer, 0.5 - 10 parts of accelerator; The weight ratio of the nickel salt to the complexing agent is 1:(0.8 - 1.4); The nickel salt is nickel sulfate; The complexing agent is sodium potassium tartrate; 2. The nickel-coated graphene according to claim 1, wherein The graphene is selected from one or more of graphene oxide, fluorinated graphene, brominated graphene, reduced graphene oxide, chlorinated graphene, graphene nitride, iodinated graphene, doped graphene, hydrogenated graphene; 3. The nickel-coated graphene according to claim 1, wherein The weight ratio of the nickel salt to the complexing agent is 1:(0.9 - 1.2); 4. The nickel-coated graphene according to claim 1, wherein The reducing agent is a nitrogen-containing compound; 5. The nickel-coated graphene according to claim 1, wherein, The stabilizer is a sulfur-containing compound; 6. The nickel-coated graphene according to claim 5, wherein The sulfur-containing compound is selected from one or more of sodium bisulfite, thiourea, allylthiourea, sodium sulfide, sodium sulfite; 7. The preparation method of nickel-coated graphene according to any one of claims 1 - 6, comprising the following steps: S1. Perform surface treatment on the graphene; S2. Add the nickel salt, complexing agent, carboxyl compound, stabilizer, and accelerator into a reaction kettle; S3. Raise the temperature of the reaction kettle and add the carboxyl compound and nickel salt solution; S4. Add the graphene treated in S1 into the reaction kettle, and add the stabilizer and accelerator; S5. Add the reducing agent into the reaction kettle and stir for 0.1 - 5 h; S6. Filter and dry the solution to obtain nickel-coated graphene.

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