Graphene-graphite electrode preparation method and graphene-graphite electrode

Abstract

The preparation method of the graphene-graphite electrode comprises the following steps: screening calcined petroleum coke to obtain calcined petroleum coke particles with a predetermined particle size and calcined petroleum coke powder with a predetermined purity; a preset amount of calcined petroleum coke particles and powder and high-purity graphite powder are stirred and mixed to obtain a first mixture, heating is conducted in the stirring process to enable the temperature of the first mixture to be kept at 140 DEG C, and it is guaranteed that open pores of the calcined petroleum coke are in an open state to the maximum extent; adding graphene into the first mixture, and stirring and mixing at the temperature of 140 DEG C, so that the graphene can permeate into the open pores of the calcined petroleum coke to obtain a second mixture; adding a carbon resin adhesive into the second mixture for mixing and kneading to obtain a mixed and kneaded paste material, and carrying out extrusion forming to obtain an electrode green body; and after roasting and dipping the electrode green body, feeding the electrode green body into a graphitization furnace for graphitization, and then carrying out machining to obtain the graphene-graphite electrode. The invention also provides a graphene-graphite electrode.

Description

Technical Field

[0001] The present invention relates to the technical field of graphite electrodes, and in particular to a method for preparing a graphene graphite electrode and a graphene graphite electrode. Background Art

[0002] Graphite electrodes are conductors that heat and melt the charge in an electric arc furnace by releasing electrical energy in the form of an arc. They are categorized by quality specifications as standard power, high power, and ultra-high power. Graphite electrodes are typically made by mixing, shaping, calcining, graphitizing, and machining petroleum coke, pitch coke, or needle coke, and graphite flakes as aggregates with coal tar as a binder. They are an important high-temperature conductive material for electric furnace steelmaking. Electric energy is fed into the furnace through the graphite electrodes, and the high temperature generated by the arc between the electrode tip and the charge serves as a heat source, melting the charge for steelmaking. Graphite electrodes are also commonly used as conductive materials in other types of electric smelting or electrolytic equipment.

[0003] Due to the large number of raw materials used in the production of graphite electrodes, there are problems such as poor mixing and dispersion and low interfacial interaction, which result in the relevant performance of the graphitized electrode failing to meet the target. Among them, the binder is one of the key factors in this problem. Generally, the binder needs to have good kneading fluidity, high interfacial interaction and high carbon residue. The most common binder is asphalt. However, the current high-temperature asphalt has the defects of poor binder properties and high volatile content. This will cause the prepared graphite electrode to have high air permeability, resulting in high resistivity and poor mechanical and thermal properties.

[0004] In order to solve the above technical problems, the existing technology (patent application number 202411616112.X, invention name is a Chinese invention patent application for a method for preparing large-size graphite electrodes for metal silicon smelting) provides the following technical solutions: Step 1: dry-mix calcined petroleum coke and electrode graphite evenly, add high-temperature modified asphalt, heat and knead to obtain a paste; Step 2: cool the paste to 130-140°C, adopt a vertical vibration horizontal extrusion molding process, and apply a vertical pressure of 17-22 kg / cm 2 The electrode is first pressed and then vibrated, cooled in a cold water pool for 6 to 8 hours, and then left to stand for 48 hours to obtain an electrode precursor. Step 3: The electrode precursor is calcined and graphitized to obtain a large-scale graphite electrode. The quality indicators of the large-scale graphite electrode are a resistivity of 8.7 μΩm and a thermal expansion coefficient of 2.61×10 -6 / ℃.

[0005] The preparation method of high-temperature modified asphalt is as follows: Step 1: adding nanomaterials (nanomaterials are composed of graphene, carbon nanotubes, and molybdenum disilicide) and epoxy macromolecular silane coupling agent to anhydrous toluene, and dripping triethylamine; reflux at 110-115°C for 2-3 hours under nitrogen atmosphere; washing, drying, and obtaining modified nanomaterials; (2) adding the modified nanomaterials to 0.1-0.12 mol / L sulfuric acid solution, heating to 50-55°C, and stirring for 6-8 hours. When the reaction mixture is stirred for 4 to 6 hours, the mixture is filtered and washed to obtain preactivated nanomaterials; (3) the preactivated nanomaterials are dispersed in deionized water, 0.1 to 0.12 mol / L sodium periodate solution is added, and the mixture is stirred at room temperature for 4 to 6 hours; the mixture is washed and dried to obtain formaldehyde-modified nanomaterials; Step 2: high-temperature asphalt, anthracene oil, trioxymethylene, formaldehyde-modified nanomaterials, and p-toluenesulfonic acid are uniformly mixed; under a nitrogen atmosphere, the mixture is heated to 140 to 160° C. and stirred for 18 to 24 hours, and the heating is stopped to obtain high-temperature modified asphalt.

[0006] However, the above-mentioned prior art has the following technical problems: the formaldehyde-containing nanomaterials need to be prepared before kneading, and the formaldehyde-containing nanomaterials, anthracene oil, trioxymethylene, p-toluenesulfonic acid and high-temperature asphalt need to be stirred and heated for a long time. This makes the graphite electrode production process complicated and increases production costs. At the same time, the resistivity, thermal expansion coefficient and other indicators of the graphite electrode obtained using the above-mentioned preparation method tend to decrease. Summary of the Invention

[0007] In view of this, it is necessary to provide a method for preparing graphene graphite electrodes with a simple production process and the ability to reduce resistivity and thermal expansion coefficient.

[0008] It is also necessary to provide a graphene graphite electrode prepared using the above-mentioned graphene graphite electrode preparation method.

[0009] A method for preparing a graphene graphite electrode comprises the following steps: screening calcined petroleum coke to obtain calcined petroleum coke particles of a predetermined particle size; pulverizing the calcined petroleum coke to obtain calcined petroleum coke powder of a predetermined purity; A first mixture is obtained by stirring and mixing a predetermined amount of calcined petroleum coke particles, calcined petroleum coke powder, and high-purity graphite powder for a predetermined time, wherein the first mixture is heated during the stirring process so that the temperature of the first mixture is maintained at 140° C. to ensure that the open pores of the calcined petroleum coke are in a state of maximum openness; adding graphene to the first mixture and stirring and mixing the mixture at a temperature of 140° C. for a predetermined time, so that the graphene can penetrate into the open pores of the calcined petroleum coke, to obtain a second mixture; Adding a carbon resin binder to the second mixed material and kneading for a predetermined time to obtain a kneaded paste, and maintaining the temperature at not less than 160° C. during the kneading process; When the temperature of the kneaded paste drops to 100°C, it is added to a 1500-ton hydraulic horizontal molding machine and extruded into electrode embryos of predetermined specifications. The electrode embryos of predetermined specifications are calcined and impregnated, and then sent to a graphitization furnace for graphitization and then mechanically processed to obtain graphene graphite electrodes.

[0010] Preferably, the mass proportions of calcined petroleum coke, high-purity graphite powder, graphene, and carbon resin binder are: 68 to 72 parts of calcined petroleum coke, 12 to 14 parts of high-purity graphite powder, 14 to 20 parts of graphene, and 16 to 20 parts of carbon resin binder.

[0011] Preferably, the mass proportions of calcined petroleum coke particles and calcined petroleum coke powder in the calcined petroleum coke are: 30 to 34 parts of calcined petroleum coke particles and 38 to 42 parts of calcined petroleum coke powder; the calcined petroleum coke particles include 1# calcined petroleum coke particles with a particle size of 4 mm to 2 mm, 2# calcined petroleum coke particles with a particle size of 2 mm to 1 mm, and 3# calcined petroleum coke particles with a particle size of 1 mm to 0.5 mm, with 10 to 8 parts of 1# calcined petroleum coke particles, 14 to 12 parts of 2# calcined petroleum coke particles, and 10 to 6 parts of 3# calcined petroleum coke particles; the calcined petroleum coke powder is 4# calcined petroleum coke particles with a particle size of less than 0.5 mm, and the 200 mesh pass rate of the 4# calcined petroleum coke particles is controlled at 70% to 72%.

[0012] Preferably, the method further comprises the following steps: adding a curing agent during the kneading process, wherein the curing agent is added 15 minutes before the paste is formed.

[0013] Preferably, the curing agent is powdered phenolic resin, the carbon resin adhesive is liquid phenolic resin, and the ratio of the curing agent to the carbon resin adhesive is 1:20.

[0014] Preferably, the graphene is composite conductive graphene, and the number of layers of the composite conductive graphene is less than 10.

[0015] Preferably, the process of calcining and impregnating the electrode green body of predetermined specifications is: calcining→impregnation→calcining.

[0016] Preferably, the quality indicators of the graphene graphite electrode obtained are: resistivity 2.9 μΩm, thermal expansion coefficient 1.46×10-6 / ℃, compressive strength 12.3 MPa, true density 2.12 g / cm³, and elastic modulus 1.42 GPa.

[0017] A graphene graphite electrode is prepared by the above method, and the quality indicators of the graphene graphite electrode are: resistivity of 2.9 μΩm, thermal expansion coefficient of 1.46×10 -6 / ℃, true density 2.12g / cm³, elastic modulus 1.42GPa.

[0018] In the above-mentioned graphene graphite electrode preparation method, there is no need to carry out complex modification of asphalt. A predetermined amount of calcined petroleum coke particles, calcined petroleum coke powder, and high-purity graphite powder are simply mixed and stirred and heated to 140°C to ensure that the open pores of the calcined petroleum coke are in a state of maximum openness. Graphene is added to the first mixture and stirred. The strong dispersibility of graphene enables graphene to penetrate into the open pores of the calcined petroleum coke and reach the interior of the calcined petroleum coke, filling the pores of the calcined petroleum coke. A carbon resin adhesive is then added to the second mixture and kneaded to obtain a kneaded paste. The kneaded paste is extruded to obtain an electrode green body of predetermined specifications. After the electrode green body of predetermined specifications is calcined and impregnated, it is sent to a graphitization furnace for graphitization and mechanical processing to obtain a graphene graphite electrode. The quality indicators of the obtained graphene graphite electrode reach a resistivity of 2.9 μΩm and a thermal expansion coefficient of 1.46×10 -6 / ℃, compressive strength 12.3Mpa, true density 2.12g / cm³, elastic modulus 1.42GPa. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are further described below.

[0020] It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention; the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as there is no conflict between them; based on the embodiments or examples in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] The present application provides a method for preparing a graphene graphite electrode, comprising the following steps: Step S10, screening the calcined petroleum coke to obtain calcined petroleum coke particles of a predetermined particle size; pulverizing the calcined petroleum coke to obtain calcined petroleum coke powder; Step S20, stirring and mixing a predetermined amount of calcined petroleum coke particles, calcined petroleum coke powder, and high-purity graphite powder for a predetermined time to obtain a first mixture, wherein the temperature of the first mixture is maintained at 140° C. during the stirring process to ensure that the open pores of the calcined petroleum coke are in a state of maximum openness; wherein the mass fractions of calcined petroleum coke particles and calcined petroleum coke powder in the calcined petroleum coke are: calcined petroleum coke particles are 30 to 34 parts, and calcined petroleum coke powder is 38 to 42 parts; wherein the calcined petroleum coke particles are 30 to 34 parts, and the .... It includes 1# calcined petroleum coke particles with a particle size of 4mm to 2mm, 2# calcined petroleum coke particles with a particle size of 2mm to 1mm, and 3# calcined petroleum coke particles with a particle size of 1mm to 0.5mm, with 10 to 8 parts of 1# calcined petroleum coke particles, 14 to 12 parts of 2# calcined petroleum coke particles, and 10 to 6 parts of 3# calcined petroleum coke particles; the calcined petroleum coke powder is 4# calcined petroleum coke particles with a particle size of less than 0.5mm, and the 200 mesh pass rate of 4# calcined petroleum coke particles is controlled at 70% to 72%.

[0022] Step S30, adding graphene to the first mixture and stirring and mixing at a temperature of 140°C for a predetermined time, so that the graphene can penetrate into the open pores of the calcined petroleum coke to obtain a second mixture; in other embodiments, in order to ensure that the efficiency of graphene penetrating into the open pores of the calcined petroleum coke is higher, before adding the graphene to the first mixture, the kneading equipment containing the first mixture is vacuumed, and then the graphene is added to the calcined petroleum coke in a vacuum environment for mixing, and during the mixing process, the kneading equipment driven by a vibration device is vibrated at a high frequency to enable more graphene to penetrate into the open pores of the calcined petroleum coke.

[0023] In step S40, a carbon resin binder is added to the second mixed material and kneaded for a predetermined time to obtain a kneaded paste, and the temperature is maintained at no less than 160° C. The weight proportions of calcined petroleum coke, high-purity graphite powder, graphene, and carbon resin binder are as follows: 68 to 72 parts calcined petroleum coke, 12 to 14 parts high-purity graphite powder, 14 to 20 parts graphene, and 16 to 20 parts carbon resin binder.

[0024] Step S50: When the temperature of the kneaded paste drops to 100° C., the paste is added to a 1500-ton hydraulic horizontal molding machine and extruded into an electrode blank of predetermined specifications.

[0025] In step S60, the electrode green body of predetermined specifications is calcined and impregnated, then sent to a graphitization furnace for graphitization and mechanical processing to obtain a graphene-graphite electrode. Because the open pores of the calcined petroleum coke are open at high temperature, the surface adsorption properties of the calcined petroleum coke are improved. When mixed with graphene, the micron-sized graphene penetrates and embeds into the open pores, forming a stable interface through mechanical interlocking and atomic diffusion. This enhances the bonding strength between the particles of the mixed paste during the pressing process, and improves the density of the electrode of predetermined specifications after sintering. Furthermore, because the graphene fills the spongy open pores of the calcined petroleum coke, the probability of increased conductivity caused by the open pores in the calcined petroleum coke after graphitization is reduced.

[0026] Furthermore, the method further comprises the following steps: adding a curing agent during the kneading process, wherein the curing agent is added 15 minutes before the paste is formed. The curing agent is a powdered phenolic resin, and the carbon resin adhesive is a liquid phenolic resin, which can be purchased from the market, such as PF4012 phenolic resin of Shandong Shengquan New Materials Co., Ltd. as a curing agent and EXP0326 (YJ) phenolic resin as a carbon resin adhesive, with the curing agent to carbon resin adhesive ratio being 1:20. The graphene is a composite conductive graphene, and the number of layers of the composite conductive graphene is less than 10 layers. Adding the curing agent 15 minutes before the paste is formed can ensure that the inherent properties of the curing agent are not destroyed, thereby improving the physical properties of the electrode, such as flexural strength, conductivity, thermal expansion coefficient, etc. In the prior art, curing agent and adhesive are generally added at the same time. During the stirring process, if the curing agent is added too early, it will be affected by temperature and physical shear force, which will reduce the physical properties of the curing agent, thereby affecting the final performance of the electrode. In addition, if the curing agent is added for a short time, the physical properties of the curing agent will not be fully exerted.

[0027] Furthermore, in this embodiment, the process of baking and impregnating the electrode green body of predetermined specifications is as follows: baking → impregnation → baking. Of course, in other embodiments, the electrode green body of predetermined specifications can be impregnated twice and baked three times according to actual needs.

[0028] The following examples further illustrate the above technical solution: wherein, the 1 part mentioned below refers to 1 kg of high-purity graphite powder as the benchmark, 32 parts of calcined petroleum coke particles, and 40 parts of calcined petroleum coke powder; 9 parts of 1# calcined petroleum coke particles, 13 parts of 2# calcined petroleum coke particles, and 8 parts of 3# calcined petroleum coke particles, and the 200-mesh pass rate of 4# calcined petroleum coke particles is controlled at 71%; in other examples, any one of the above ingredients can be selected as the benchmark parameter of one part by weight according to actual circumstances.

[0029] Example 1: 70 parts of calcined petroleum coke and 13 parts of high-purity graphite powder were stirred and mixed for 35 minutes to obtain a first mixture. During the stirring process, the first mixture was heated to maintain a temperature of 140°C. 17 parts of graphene were added to the first mixture and stirred and mixed at 140°C for 20 minutes to allow the graphene to penetrate the spongy open pores of the calcined petroleum coke, thereby obtaining a second mixture. 18 parts of a carbon resin adhesive were added to the second mixture and kneaded for 25 minutes to obtain a kneaded paste, with the temperature maintained at no less than 160°C during the kneading process. When the kneaded paste temperature dropped to 100°C, it was added to a 1500-ton hydraulic horizontal molding machine and extruded into an electrode blank of predetermined specifications. The electrode blank of predetermined specifications was then calcined and impregnated, and then transferred to a graphitization furnace for graphitization and mechanical processing to obtain a graphene-graphite electrode.

[0030] Comparative Example 1: 70 parts of calcined petroleum coke and 12 parts of high-purity graphite powder were stirred and mixed for 35 minutes to obtain a first mixture. During the stirring process, the mixture was heated to maintain a temperature of 140°C. 17 parts of graphene were added to 18 parts of a carbon resin binder and stirred and mixed for 20 minutes. The mixture was then added to the first mixture and stirred and mixed at 160°C for 25 minutes to obtain a kneaded paste. When the kneaded paste temperature dropped to 100°C, it was added to a 1500-ton hydraulic horizontal molding machine and extruded into an electrode blank of predetermined specifications. The electrode blank of predetermined specifications was then calcined and impregnated, then transferred to a graphitization furnace for graphitization and mechanical processing to obtain a graphene-graphite electrode.

[0031] Comparative Example 2: 70 parts of calcined petroleum coke, 12 parts of high-purity graphite powder, and 17 parts of graphene were stirred and mixed for 50 minutes to obtain a first mixture. During stirring, the first mixture was heated to maintain a temperature of 140°C. 18 parts of a carbon resin binder were added to the first mixture and kneaded for 25 minutes to obtain a kneaded paste, with the temperature maintained at no less than 160°C throughout the kneading process. When the kneaded paste temperature dropped to 100°C, it was added to a 1500-ton hydraulic horizontal molding machine and extruded into an electrode blank of predetermined specifications. The electrode blank of predetermined specifications was then calcined and impregnated, then transferred to a graphitization furnace for graphitization and mechanical processing to obtain a graphene-graphite electrode.

[0032] The comparison of the test results of the final products of the samples prepared in the above three ways is shown in Table 1. It can be seen from Table 1 that the quality index of the graphene graphite electrode in Example 1 is the best: Table 1

[0033] Furthermore, based on the preparation scheme in Example 1, samples were prepared according to different timings of adding the curing agent: Example 2: 70 parts of calcined petroleum coke and 12 parts of high-purity graphite powder were stirred and mixed for 35 minutes to obtain a first mixture. During the stirring process, the first mixture was heated to maintain a temperature of 140°C. 17 parts of graphene were added to the first mixture and stirred and mixed at 140°C for 20 minutes to allow the graphene to enter the spongy open pores of the calcined petroleum coke, thereby obtaining a second mixture. 18 parts of a carbon resin binder and 0.9 parts of a curing agent were added to the second mixture and kneaded for 25 minutes to obtain a kneaded paste. The temperature was maintained at no less than 160°C during the kneading process. When the kneaded paste temperature dropped to 100°C, it was added to a 1500-ton hydraulic horizontal molding machine and extruded into an electrode blank of predetermined specifications. The electrode blank of predetermined specifications was then calcined and impregnated, and then transferred to a graphitization furnace for graphitization to obtain a graphene-graphite electrode.

[0034] Example 3: 70 parts of calcined petroleum coke and 12 parts of high-purity graphite powder were stirred and mixed for 35 minutes to obtain a first mixture. During the stirring process, the first mixture was heated to maintain a temperature of 140°C. 17 parts of graphene were added to the first mixture and stirred and mixed at 140°C for 20 minutes to allow the graphene to enter the spongy open pores of the calcined petroleum coke, thereby obtaining a second mixture. 18 parts of a carbon resin binder were added to the second mixture and kneaded for 25 minutes to obtain a kneaded paste. Ten minutes after the addition of the carbon resin binder, 0.9 parts of a curing agent were added and kneaded for 15 minutes, with the temperature maintained at no less than 160°C throughout the kneading process. When the kneaded paste temperature dropped to 100°C, it was added to a 1500-ton hydraulic horizontal molding machine and extruded into electrodes of predetermined specifications. The electrode green sheets of predetermined specifications were then calcined and impregnated, and then transferred to a graphitization furnace for graphitization and mechanical processing to obtain graphene-graphite electrodes.

[0035] Example 4: 70 parts of calcined petroleum coke and 12 parts of high-purity graphite powder were stirred and mixed for 35 minutes to obtain a first mixture. During the stirring process, the first mixture was heated to maintain a temperature of 140°C. 17 parts of graphene were added to the first mixture and stirred and mixed at 140°C for 20 minutes to allow the graphene to penetrate the sponge-like open pores of the calcined petroleum coke, thereby obtaining a second mixture. 18 parts of a carbon resin binder were added to the second mixture and kneaded for 25 minutes to obtain a kneaded paste. 20 minutes after the addition of the carbon resin binder, 0.9 parts of a curing agent were added and kneaded for 5 minutes, with the temperature maintained at no less than 160°C throughout the kneading process. When the kneaded paste temperature dropped to 100°C, it was added to a 1500-ton hydraulic horizontal molding machine and extruded into an electrode blank of predetermined specifications. The electrode blank of predetermined specifications was then subjected to calcination and impregnation treatment, and then transferred to a graphitization furnace for graphitization and mechanical processing to obtain a graphene-graphite electrode.

[0036] Based on the preparation scheme in Example 1, the test results of the samples prepared according to different addition timings of the three curing agents are compared in Table 2. It can be seen from Table 2 that the quality index of the graphene graphite electrode in Example 3 is the best: Table 2

Claims

1. A method for preparing a graphene graphite electrode, characterized in that: The following steps are involved: Screening the calcined petroleum coke to obtain calcined petroleum coke particles of a predetermined particle size; pulverizing the calcined petroleum coke to obtain calcined petroleum coke powder of a predetermined purity; A first mixture is obtained by stirring and mixing a predetermined amount of calcined petroleum coke particles, calcined petroleum coke powder, and high-purity graphite powder for a predetermined time, wherein the first mixture is heated during the stirring process so that the temperature of the first mixture is maintained at 140° C. to ensure that the open pores of the calcined petroleum coke are in a state of maximum openness; adding graphene to the first mixture and stirring and mixing the mixture at a temperature of 140° C. for a predetermined time, so that the graphene can penetrate into the open pores of the calcined petroleum coke, to obtain a second mixture; Adding a carbon resin binder to the second mixed material and kneading for a predetermined time to obtain a kneaded paste, and maintaining the temperature at not less than 160° C. during the kneading process; When the temperature of the kneaded paste drops to 100°C, it is added to a 1500-ton hydraulic horizontal molding machine and extruded into electrode embryos of predetermined specifications. The electrode embryos of predetermined specifications are calcined and impregnated, and then sent to a graphitization furnace for graphitization and then mechanically processed to obtain graphene graphite electrodes.

2. The method for preparing a graphene graphite electrode according to claim 1, wherein: The mass proportions of calcined petroleum coke, high-purity graphite powder, graphene, and carbon resin binder are as follows: calcined petroleum coke is 68 to 72 parts, high-purity graphite powder is 12 to 14 parts, graphene is 14 to 20 parts, and carbon resin binder is 16 to 20 parts.

3. The method for preparing a graphene graphite electrode according to claim 2, wherein: The mass proportions of calcined petroleum coke particles and calcined petroleum coke powder in the calcined petroleum coke are: calcined petroleum coke particles are 30 to 34 parts, and calcined petroleum coke powder is 38 to 42 parts; the calcined petroleum coke particles include 1# calcined petroleum coke particles with a particle size of 4 mm to 2 mm, 2# calcined petroleum coke particles with a particle size of 2 mm to 1 mm, and 3# calcined petroleum coke particles with a particle size of 1 mm to 0.5 mm, with 10 to 8 parts of 1# calcined petroleum coke particles, 14 to 12 parts of 2# calcined petroleum coke particles, and 10 to 6 parts of 3# calcined petroleum coke particles; the calcined petroleum coke powder is 4# calcined petroleum coke particles with a particle size of less than 0.5 mm, and the 200 mesh pass rate of 4# calcined petroleum coke particles is controlled at 70% to 72%.

4. The method for preparing a graphene graphite electrode according to claim 2 or 3, wherein: Add curing agent during the kneading process. The timing of adding curing agent is: add curing agent 15 minutes before the paste is produced.

5. The method for preparing a graphene graphite electrode according to claim 4, wherein: The curing agent is powdered phenolic resin, the carbon resin adhesive is liquid phenolic resin, and the ratio of the curing agent to the carbon resin adhesive is 1:

20.

6. The method for preparing a graphene graphite electrode according to claim 5, wherein: The graphene is composite conductive graphene, and the number of layers of the composite conductive graphene is less than 10.

7. The method for preparing a graphene graphite electrode according to claim 1, wherein: The process of baking and impregnating the electrode green body of predetermined specifications is as follows: baking→impregnation→baking.

8. The method for preparing a graphene graphite electrode according to claim 6, wherein: The quality indicators of the graphene graphite electrode obtained are: resistivity 2.9μΩm, thermal expansion coefficient 1.46×10-6 / ℃, compressive strength 12.3Mpa, true density 2.12g / cm³, and elastic modulus 1.42GPa.

9. A graphene graphite electrode, which is prepared by any one of the graphene graphite electrode preparation methods described in 1 to 8 above, and the quality indicators of the graphene graphite electrode are: resistivity of 2.9 μΩm, thermal expansion coefficient of 1.46×10 -6 / ℃, true density 2.12g / cm³, elastic modulus 1.42GPa.

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