Graphitization Furnace and Battery Production Equipment

Abstract

The present application provides a graphitization furnace and a battery production device. The graphitization furnace includes: a furnace body, in which a material passage is provided; a first electrode, arranged along the extending direction of the material passage and partially located in the material passage; the first electrode includes a substrate and a first wear-resistant conductive layer provided on the surface of the substrate; a second electrode, having a polarity opposite to that of the first electrode; the second electrode extends into the material passage and is arranged at an interval from the first electrode. This graphitization furnace has a long service life.

Description

Technical Field

[0001] The present application relates to the technical field of battery production equipment, and in particular to a graphitization furnace and battery production equipment. Background Art

[0002] In recent years, as the application scope of battery technology has become increasingly wider, batteries have been widely used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, as well as in many fields such as power tools, electric bicycles, electric motorcycles and electric vehicles.

[0003] Currently, carbon materials are widely used as negative electrode materials for batteries. Graphitized carbon materials (also known as graphite materials) have gained large-scale commercial application due to their long service life, stable structure, and low cost. The lifespan of a graphitization furnace, a device that produces graphite materials, is crucial for the production of graphite and batteries.

[0004] In view of this, how to improve the service life of the graphitization furnace is a technical problem that needs to be solved urgently. Summary of the Invention

[0005] The present application is made in view of the above-mentioned problems, and one of its purposes is to provide a graphitization furnace and battery production equipment, wherein the graphitization furnace has a long service life.

[0006] In order to achieve the above-mentioned object, the first aspect of the present application provides a graphitization furnace, comprising:

[0007] A furnace body, wherein a material channel is provided in the furnace body;

[0008] a first electrode, arranged along the extension direction of the material channel and partially located in the material channel; the first electrode comprises a substrate and a first wear-resistant conductive layer provided on the surface of the substrate;

[0009] The second electrode has a polarity opposite to that of the first electrode; the second electrode extends into the material channel and is spaced apart from the first electrode.

[0010] By providing a first wear-resistant conductive layer on the substrate surface of the first electrode, the wear resistance of the first electrode can be effectively improved, reducing the wear on the first electrode caused by the material in the material channel flowing downward along the first electrode. At the same time, it can provide good electrical conductivity to effectively heat the material and graphitize it. In addition, the first wear-resistant conductive layer can effectively isolate oxygen from direct contact with the first electrode, alleviating oxidation of the area of the first electrode corresponding to the insertion port. By providing the above-mentioned first wear-resistant conductive layer, the service life of the first electrode can be effectively extended, thereby improving the service life of the graphitization furnace.

[0011] In any embodiment, the first wear-resistant conductive layer includes a first binder, a first conductive agent, and a first wear-resistant filler. Thus, the first wear-resistant conductive layer contains the first conductive agent and the first wear-resistant filler, having good electrical conductivity and being able to improve the wear resistance of the first electrode.

[0012] In any embodiment, the first binder includes one or more of phenolic resin, epoxy resin, bismaleimide resin, vinyl resin, and cyanate resin.

[0013] In any embodiment, the first conductive agent includes one or more of carbon materials, metal materials, and conductive polymers.

[0014] In any embodiment, the first wear-resistant filler includes one or more of poly-L-glutamic acid graphene composite, boron carbide, silicon carbide, metal powder, and alumina powder.

[0015] In any embodiment, the carbon materials include one or more of graphene, graphene oxide, carbon fiber, and carbon nanotube; the metal materials include one or more of silver powder, copper powder, silver fiber, and copper fiber.

[0016] Using the above-mentioned first binder, first conductive agent, and first wear-resistant filler to form the first wear-resistant conductive layer is beneficial to make the first wear-resistant conductive layer have good wear resistance and electrical conductivity.

[0017] In any embodiment, the mass ratio of the first binder, the first conductive agent, and the first wear-resistant filler is 1~3:5~7:2~4. Thus, it is beneficial to make the first wear-resistant conductive layer have better wear resistance and electrical conductivity, and have a lower friction coefficient; thereby being beneficial to extending the service life of the first electrode and the graphitization furnace.

[0018] In any embodiment, the thickness of the first wear-resistant conductive layer is 30μm~200μm. Thus, it is beneficial to improve the wear resistance of the first electrode, delay the oxidation and wear of the first electrode, and further extend the service life of the first electrode.

[0019] In any embodiment, the thermal expansion coefficient of the first wear-resistant conductive layer is 10×10 -6 / ℃~100×10 -6 / ℃. Thus, the first wear-resistant conductive layer has a small thermal expansion coefficient and is not prone to cracking and failure.

[0020] In any embodiment, the number of grinding rotations of the first wear-resistant conductive layer under the conditions of 23±2℃ and relative humidity of 50±5% is 9000 rotations~11000 rotations. Thus, the first wear-resistant conductive layer has good wear resistance, can effectively enhance the ability of the first electrode to resist material erosion, and improve the service life of the first electrode.

[0021] In any embodiment, the friction coefficient of the first wear-resistant conductive layer is 0.2 to 0.4. Thus, the first wear-resistant conductive layer has a small friction coefficient, which is beneficial to further reduce the wear of the first electrode during the material flow in the material channel, thereby facilitating the improvement of the service life of the first electrode.

[0022] In any embodiment, the conductivity of the first wear-resistant conductive layer is 50 μS / cm to 1000 mS / cm. Thus, the first wear-resistant conductive layer has a suitable conductivity, which is beneficial to introducing current into the material to heat the material.

[0023] In any embodiment, the first electrode further includes a second wear-resistant conductive layer, and the second wear-resistant conductive layer is disposed between the substrate and the first wear-resistant conductive layer. Thus, a double-layer coating structure is formed by arranging the second wear-resistant conductive layer between the first wear-resistant conductive layer and the substrate, which is beneficial to further improving the wear resistance and oxidation resistance of the first electrode and extending the service life of the first electrode and the graphitization furnace.

[0024] In any embodiment, the material of the second wear-resistant conductive layer includes a second binder, a second conductive agent, and a second wear-resistant filler. Thus, by combining the second wear-resistant conductive layer with the above composition with the first wear-resistant conductive layer, the service life of the first electrode can be effectively extended.

[0025] In any embodiment, the second binder includes one or more of phenolic resin, epoxy resin, bismaleimide resin, vinyl resin, and cyanate resin.

[0026] In any embodiment, the second conductive agent includes one or more of carbon materials, metal materials, and conductive polymers.

[0027] In any embodiment, the second wear-resistant filler includes one or more of poly-L-glutamic acid graphene composite, boron carbide powder, silicon carbide powder, metal powder, and alumina powder.

[0028] In any embodiment, the carbon materials include one or more of graphene, graphene oxide, carbon fiber, and carbon nanotube; the metal materials include one or more of silver powder, copper powder, silver fiber, and copper fiber.

[0029] Using the above second binder, second conductive agent, and second wear-resistant filler to form the second wear-resistant conductive layer is beneficial to endowing the second wear-resistant conductive layer with good wear resistance and conductivity.

[0030] In any implementation, the mass ratio of the second binder, the second conductive agent, and the second wear-resistant filler is 2-4:4-8:1-2. In this way, it is beneficial for the second wear-resistant conductive layer to have good wear resistance and good electrical conductivity at the same time.

[0031] In any implementation, the thickness ratio of the second wear-resistant conductive layer to the first wear-resistant conductive layer is 1:1-8.7. In this way, the thickness of the first wear-resistant conductive layer is equal to or greater than the thickness of the second wear-resistant conductive layer, which is beneficial for the first wear-resistant conductive layer to have good wear resistance and extend the service life of the first electrode.

[0032] In any implementation, the thickness ratio of the second wear-resistant conductive layer to the first wear-resistant conductive layer is 1:1-4.3. In this way, the thickness of the first wear-resistant conductive layer is equal to or thicker than that of the second wear-resistant conductive layer, which is more beneficial for extending the service life of the first electrode.

[0033] In any implementation, the thickness of the second wear-resistant conductive layer is 20μm-40μm. In this way, combined with the first wear-resistant conductive layer with a specific thickness, it is beneficial for extending the service life of the first electrode.

[0034] In any implementation, the thermal expansion coefficient ratio of the second wear-resistant conductive layer to the first wear-resistant conductive layer is 1:1-1.5. In this way, it is more beneficial to alleviate the cracking of the coating in an environment with a relatively high temperature in the material channel, and it can better take into account the internal expansion, facilitate the release of the internal expansion force, and is more beneficial for extending the service life of the first electrode.

[0035] In any implementation, the thermal expansion coefficient ratio of the second wear-resistant conductive layer to the first wear-resistant conductive layer is 1:1-1.2. In this way, the second wear-resistant conductive layer and the first wear-resistant conductive layer can be better matched, and at the same time, it is beneficial for the release of the internal expansion force and alleviates the cracking of the coating.

[0036] In any implementation, the thermal expansion coefficient of the second wear-resistant conductive layer is 5×10 -6 / ℃~30×10 -6 / ℃. In this way, the second wear-resistant conductive layer has a suitable thermal expansion coefficient. Combined with the first wear-resistant conductive layer with a specific thermal expansion coefficient, the first electrode can have a long service life.

[0037] In any implementation, the number of grinding rotations of the second wear-resistant conductive layer under the conditions of 23±2℃ and a relative humidity of 50±5% is 6000-8000 rotations. In this way, the second wear-resistant conductive layer has good wear resistance, which is beneficial for resisting the erosion of the material on the first electrode and is beneficial for improving the service life of the first electrode.

[0038] In any embodiment, the friction coefficient of the second wear-resistant conductive layer is 0.3 to 0.6.

[0039] In any embodiment, the conductivity of the second wear-resistant conductive layer is 10 μS / cm to 500 μS / cm. In this way, the second wear-resistant conductive layer has a high conductivity, which is beneficial to introducing current into the material to heat the material.

[0040] In any embodiment, the second electrode extends radially along the material channel.

[0041] In any embodiment, the number of the second electrodes is plural, and the plural second electrodes are arranged at intervals along the circumferential direction of the material channel. In this way, it is beneficial to make the electric field distribution in the cross section of the material channel more uniform, and beneficial to improving the uniformity of material graphitization.

[0042] In any embodiment, the first electrode is a positive electrode and the second electrode is a negative electrode.

[0043] The second aspect of the present application provides a battery production device, including the graphitization furnace of the first aspect of the present application, and the graphitization furnace is used for producing the negative electrode graphite material of the battery.

[0044] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are hereinafter specifically exemplified. Description of the Drawings

[0045] To better describe and illustrate the embodiments or examples provided by the present application, one or more drawings can be referred to. The additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed applications, the currently described embodiments or examples, and the currently understood best mode of these applications. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0046] Figure 1 is a schematic structural diagram of a graphitization furnace according to an embodiment of the present application;

[0047] Figure 2 is an enlarged structural view of the first electrode in the graphitization furnace according to an embodiment of the present application.

[0048] Description of the Reference Numerals:

[0049] 100, Graphitization Furnace; 110, Furnace Body; 111, Material Passage; 120, First Electrode; 121, Substrate; 122, First Wear-resistant Conductive Layer; 123, Second Wear-resistant Conductive Layer; 130, Second Electrode; 140, Power Supply; 151, Silo; 152, Feed Pipe; 153, Material Cut-off Valve; 160, Tail Gas Treatment Unit; 170, Cooling and Discharging Unit. Detailed Embodiments

[0050] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise specifically defined.

[0053] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0054] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0055] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0056] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application.

[0057] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "attachment", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0058] The "range" disclosed in the present application can be defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a specific range. The range defined in this way can include or not include the end values. Any end value can be independently included or not included, and can be combined arbitrarily, that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, ranges of 60-110 and 80-120 are also contemplated. In addition, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4, and 5 are also listed, the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In the present application, unless otherwise stated, the numerical range "a~b" represents an abbreviated representation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0~5" means that all real numbers between "0~5" have been fully listed in this article, and "0~5" is only an abbreviated representation of these numerical combinations. Additionally, when stating that a certain parameter is an integer ≥2, it is equivalent to listing that the parameter is, for example, the integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. For example, when stating that a certain parameter is an integer selected from "2~10", it is equivalent to listing the integers 2, 3, 4, 5, 6, 7, 8, 9, and 10.

[0059] In this application, in an open technical feature or technical solution described by words such as "containing", "including", and "comprising", without other specifications, additional members other than the listed members are not excluded. It can be regarded as providing both a closed feature or solution composed of the listed members and an open feature or solution that also includes additional members outside the listed members. For example, A includes a1, a2, and a3. Without other specifications, it may also include other members or may not include additional members. It can be regarded as providing both a feature or solution where "A is composed of a1, a2, and a3" and a feature or solution where "A not only includes a1, a2, and a3 but also includes other members". In this application, without other specifications, A (such as B) means that B is a non-limiting example of A, and it can be understood that A is not limited to B.

[0060] In this application, "optionally", "optional", and "option" mean that it can be either present or absent, that is, it refers to any one of two parallel options of "present" or "absent". If "optional" appears multiple times in a technical solution, without special specifications and without contradictions or mutual constraints, each "optional" is independent.

[0061] Currently, among the anode materials of batteries, carbon materials are widely used. Among them, graphitized carbon materials have been widely commercially applied due to advantages such as long service life, stable structure, and low cost. A graphitization furnace is a device that can generate graphite materials, and the length of its service life is extremely important for the production and manufacturing of graphite and batteries.

[0062] During the production process of a continuous graphitization furnace kiln, the positive electrode is inserted from the feeding end of the material along the extension direction of the material channel into the core temperature area of the material channel in the furnace body, and the negative electrode is inserted into the material channel from the side of the furnace body. The positive electrode and the negative electrode are spaced apart. After power is applied, an electric field is generated in the material channel. When the material in the material channel passes through this electric field, Joule heat will be generated based on its own resistance, thus forming a high-temperature area. After passing through this high-temperature area, the material can be graphitized.

[0063] The upper end of the positive electrode of the graphitization furnace usually needs to extend outside the furnace body for electrical connection with the power supply. During the operation of the continuous graphitization furnace, the inside of the furnace is generally slightly negative pressure, and a small amount of air will enter the material channel from the insertion port of the positive electrode. Moreover, the temperature in the material channel is relatively high, making the positive electrode (usually a graphite electrode) at the insertion port easily oxidized, resulting in the corresponding part of the positive electrode at the insertion port gradually becoming smaller due to oxidation. When it reaches a certain degree, the lower end of the positive electrode may fall into the furnace, affecting the service life of the graphitization furnace.

[0064] In addition, during the production process of a continuous graphitization furnace, the bottom of the positive electrode is close to the core temperature zone in the material channel, and the material in the material channel always flows downward along the positive electrode. During the flow of the material, it will cause significant wear to the positive electrode and also reduce the service life of the positive electrode.

[0065] Based on this, please refer to Figure 1 and Figure 2 , an embodiment of the present application provides a graphitization furnace 100, which includes a furnace body 110, a first electrode 120, and a second electrode 130. Among them, a material channel 111 is provided in the furnace body 110, and the material channel 111 extends from the upper part to the lower part of the furnace body 110; the first electrode 120 is arranged along the extension direction of the material channel 111 and partially arranged in the material channel 111; the first electrode 120 includes a substrate 121 and a first wear-resistant conductive layer 122 provided on the surface of the substrate 121; the second electrode 130 has a polarity opposite to that of the first electrode 120; the second electrode 130 extends into the material channel 111 and is arranged at an interval from the first electrode 120.

[0066] In the graphitization furnace 100 of the present application, by providing the first wear-resistant conductive layer 122 on the surface of the substrate 121, the wear resistance of the first electrode 120 can be effectively improved, and the wear caused to the substrate 121 when the material in the material channel 111 flows downward along the first electrode 120 can be reduced; at the same time, it can provide good conductivity to effectively heat the material to make it graphitized; and, the first wear-resistant conductive layer 122 can effectively isolate the direct contact between oxygen and the substrate 121, and alleviate the oxidation of the part of the substrate 121 corresponding to the insertion port. Through the above-mentioned first wear-resistant conductive layer 122, the service life of the first electrode 120 can be effectively extended, thereby improving the service life of the graphitization furnace 100.

[0067] It should be noted that the above-mentioned first electrode 120 is a positive electrode, and the second electrode 130 is a negative electrode. Both the first electrode 120 and the second electrode 130 can use graphite electrodes. The graphitization furnace 100 further includes a power supply 140, and the first electrode 120 and the second electrode 130 are respectively connected to the positive and negative electrodes of the power supply 140. If the graphitization furnace 100 is arranged vertically, that is, the material channel 111 is vertically arranged, and the material flows downward along the material channel 111 under the action of gravity, which is consistent with the natural flow law of the object, then the first electrode 120 extends in the vertical direction. If the graphitization furnace 100 is arranged horizontally, that is, the material channel is horizontally arranged, and the material flows along the material channel 111 in the horizontal direction, then the first electrode 120 extends in the horizontal direction. Figure 1 In the middle is a vertical graphitization furnace 100, and the extension direction of the material channel 111 in the graphitization furnace 100 is the vertical direction.

[0068] Understandably, the first wear-resistant conductive layer 122 refers to a coating with good wear resistance and good electrical conductivity at the same time.

[0069] In some of these embodiments, the first wear-resistant conductive layer 122 includes a first binder, a first conductive agent, and a first wear-resistant filler. Among them, the first binder includes one or more of phenolic resin, epoxy resin, bismaleimide resin, vinyl resin, and cyanate resin. The first conductive agent includes one or more of carbon materials, metal materials, and conductive polymers. Among them, the carbon materials include one or more of graphene, graphene oxide, carbon fiber, and carbon nanotubes; the metal materials include one or more of silver powder, copper powder, silver fiber, and copper fiber. The first wear-resistant filler includes one or more of poly-L-glutamic acid graphene composite, boron carbide powder, silicon carbide powder, metal powder, and alumina powder.

[0070] By using the above-mentioned first binder, first conductive agent, and first wear-resistant filler to form the first wear-resistant conductive layer 122, the first wear-resistant conductive layer 122 can have good wear resistance and electrical conductivity, with a small friction coefficient and good surface slidability. By providing the above-mentioned first wear-resistant conductive layer 122 on the surface of the substrate 121, it is beneficial to enable the first electrode 120 and the graphitization furnace 100 to have a long service life.

[0071] In some of these embodiments, the mass ratio of the first binder, the first conductive agent, and the first wear-resistant filler in the first wear-resistant conductive layer 122 is 1 to 3: 5 to 7: 2 to 4. Controlling the components within the above ranges is beneficial to enable the first wear-resistant conductive layer 122 to have good wear resistance and electrical conductivity, with a low friction coefficient and good surface slidability; it is beneficial to extend the service life of the first electrode 120 and the graphitization furnace 100.

[0072] In some of these embodiments, the thickness of the first wear-resistant conductive layer 122 is 30μm to 200μm. Controlling the thickness of the first wear-resistant conductive layer 122 within the above range is beneficial to improving the wear resistance of the first electrode 120, delaying the oxidation and wear of the first electrode 120, and thus extending the service life of the first electrode 120.

[0073] Understandably, the thickness of the first wear-resistant conductive layer 122 can be 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm, 200μm, and any value within the range formed by any two of the above values.

[0074] In some of these embodiments, the coefficient of thermal expansion of the first wear-resistant conductive layer 122 is 10×10 -6 / ℃ to 100×10 -6 / ℃. Thus, the first wear-resistant conductive layer 122 has a small coefficient of thermal expansion, and it is not prone to cracking and failure under the condition of a relatively high temperature in the material channel 111.

[0075] Understandably, the coefficient of thermal expansion of the first wear-resistant conductive layer 122 can be 10×10 -6 / ℃, 20×10 -6 / ℃, 30×10 -6 / ℃, 40×10 -6 / ℃, 50×10 -6 / ℃, 60×10 -6 / ℃, 70×10 -6 / ℃, 80×10 -6 / ℃, 90×10 -6 / ℃, 100×10 -6 / ℃ and any value within the range formed by any two of the above values.

[0076] In some embodiments, the number of grinding rotations of the first wear-resistant conductive layer 122 under the conditions of 23±2℃ and a relative humidity of 50±5% is 9000 to 11000 rotations. Thus, the first wear-resistant conductive layer 122 has good wear resistance, can effectively improve the ability of the first electrode 120 to resist material erosion, and extend the service life of the first electrode 120.

[0077] In some embodiments, the friction coefficient of the first wear-resistant conductive layer 122 is 0.2 to 0.4. Thus, the first wear-resistant conductive layer 122 has a small friction coefficient and good slipperiness on its surface, which is beneficial to further reducing the wear of the substrate 121 during the material flow in the material channel 111, thereby being beneficial to extending the service life of the first electrode 120.

[0078] It can be understood that the friction coefficient of the first wear-resistant conductive layer 122 can be 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4 and any value within the range formed by any two of the above values.

[0079] In some embodiments, the conductivity of the first wear-resistant conductive layer 122 is 50 μS / cm to 1000 mS / cm. Thus, the first wear-resistant conductive layer 122 has a suitable conductivity, can effectively form conduction between the contact part of the substrate 121 and the power supply 140, and is beneficial to introducing current into the material to heat the material.

[0080] It is understandable that the conductivity of the first wear-resistant conductive layer 122 can be 50 μS / cm, 100 μS / cm, 500 μS / cm, 1 mS / cm, 10 mS / cm, 100 mS / cm, 300 mS / cm, 500 mS / cm, 800 mS / cm, 1000 mS / cm, and any value within the range formed by any two of the above values.

[0081] In some embodiments, the first electrode 120 further includes a second wear-resistant conductive layer 123, and the second wear-resistant conductive layer 123 is disposed between the substrate 121 and the first wear-resistant conductive layer 122. By providing the second wear-resistant conductive layer 123 inside the first wear-resistant conductive layer 122, a double-layer coating structure is formed, which is beneficial to further improving the wear resistance and oxidation resistance of the first electrode 120, and further extending the service life of the first electrode 120 and the service life of the graphitization furnace 100.

[0082] It is understandable that the second wear-resistant conductive layer 123 refers to a coating with good wear resistance and good electrical conductivity.

[0083] In some embodiments, the material of the second wear-resistant conductive layer 123 includes a second binder, a second conductive agent, and a second wear-resistant filler. Among them, the second binder includes one or more of phenolic resin, epoxy resin, bismaleimide resin, vinyl resin, and cyanate resin; the second conductive agent includes one or more of carbon materials, metal materials, and conductive polymers; among them, the carbon materials include one or more of graphene, graphene oxide, carbon fiber, and carbon nanotube; the metal materials include one or more of silver powder, copper powder, silver fiber, and copper fiber. The second wear-resistant filler includes one or more of poly-L-glutamic acid graphene composite, boron carbide powder, silicon carbide powder, metal powder, and alumina powder. Thus, by using the second wear-resistant conductive layer 123 composed of the above-mentioned second binder, second conductive agent, and second wear-resistant filler and combining it with the first wear-resistant conductive layer 122, the service life of the first electrode 120 can be effectively extended.

[0084] In some embodiments, the mass ratio of the second binder, the second conductive agent, and the second wear-resistant filler in the second wear-resistant conductive layer 123 is 2-4:4-8:1-2. Thus, it is beneficial to make the second wear-resistant conductive layer 123 have good wear resistance and good electrical conductivity.

[0085] In some of these embodiments, the thickness ratio of the second wear-resistant conductive layer 123 to the first wear-resistant conductive layer 122 is 1:1 to 8.7. In this way, making the thickness of the first wear-resistant conductive layer 122 equal to or greater than the thickness of the second wear-resistant conductive layer 123 is beneficial for the first wear-resistant conductive layer 122 to have better wear resistance, for the first electrode 120 to better maintain its double-layer coating structure during use, and for extending the service life of the first electrode 120.

[0086] Understandably, the thickness ratio of the second wear-resistant conductive layer 123 to the first wear-resistant conductive layer 122 can be 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:8.7, and any ratio within the range formed by any two of the above ratios.

[0087] Optionally, the thickness ratio of the second wear-resistant conductive layer 123 to the first wear-resistant conductive layer 122 is 1:1 to 4.3.

[0088] In some of these embodiments, the thickness of the second wear-resistant conductive layer 123 is 20 μm to 40 μm. In this way, combined with the first wear-resistant conductive layer 122 with a thickness of 30 μm to 200 μm, it is beneficial for extending the service life of the first electrode 120. Understandably, the thickness of the second wear-resistant conductive layer 123 can be 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, 31 μm, 32 μm, 33 μm, 34 μm, 35 μm, 36 μm, 37 μm, 38 μm, 39 μm, 40 μm, and any value within the range formed by any two of the above values.

[0089] In some of these embodiments, the thermal expansion coefficient ratio of the second wear-resistant conductive layer 123 to the first wear-resistant conductive layer 122 is 1:1 to 1.5. In this way, making the thermal expansion coefficients of the second wear-resistant conductive layer 123 and the first wear-resistant conductive layer 122 close can enable the second wear-resistant conductive layer 123 and the first wear-resistant conductive layer 122 to better match, which is more beneficial for alleviating the cracking of the coating in an environment with a relatively high temperature in the material channel 111, and is beneficial for extending the service life of the first electrode 120. Setting the thermal expansion coefficient of the first wear-resistant conductive layer 122 to be equal to that of the second wear-resistant conductive layer 123, or slightly larger than the thermal expansion coefficient of the second wear-resistant conductive layer 123, can better balance the internal expansion and facilitate the release of the internal expansion force.

[0090] It can be understood that the thermal expansion coefficient ratio of the second wear-resistant conductive layer 123 to the first wear-resistant conductive layer 122 can be 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, and any ratio within the range formed by any two of the above ratios.

[0091] Optionally, the ratio of the coefficient of thermal expansion of the second wear-resistant conductive layer 123 to that of the first wear-resistant conductive layer 122 is 1:1 to 1.2. In this way, the second wear-resistant conductive layer 123 and the first wear-resistant conductive layer 122 can be better matched, and at the same time, it is beneficial to the release of internal expansion force and alleviates the situation of coating cracking.

[0092] In some embodiments, the coefficient of thermal expansion of the second wear-resistant conductive layer 123 is 5×10 -6 / °C to 30×10 -6 / °C. In this way, the second wear-resistant conductive layer 123 has a suitable coefficient of thermal expansion. When combined with the first wear-resistant conductive layer 122 with a specific coefficient of thermal expansion, the first electrode 120 can have a longer service life.

[0093] It can be understood that the coefficient of thermal expansion of the second wear-resistant conductive layer 123 can be 5×10 -6 / °C, 8×10 -6 / °C, 10×10 -6 / °C, 12×10 -6 / °C, 15×10 -6 / °C, 18×10 -6 / °C, 20×10 -6 / °C, 22×10 -6 / °C, 25×10 -6 / °C, 28×10 -6 / °C, 30×10 -6 / °C and any value within the range formed by any two of the above values.

[0094] In some embodiments, the number of grinding rotations of the second wear-resistant conductive layer 123 at 23±2°C and a relative humidity of 50±5% is 6000 to 8000 rotations. In this way, the second wear-resistant conductive layer 123 has good wear resistance, which is beneficial to resisting the erosion of the material on the substrate 121 and is beneficial to improving the service life of the first electrode 120.

[0095] In some embodiments, the friction coefficient of the second wear-resistant conductive layer 123 is 0.3 to 0.6. In this way, the second wear-resistant conductive layer 123 has a small friction coefficient. After the first wear-resistant conductive layer 122 is worn, the second wear-resistant conductive layer 123 can still keep the surface of the first electrode 120 in good sliding property, which is beneficial to reducing the wear of the material on the first electrode 120.

[0096] It can be understood that the friction coefficient of the second wear-resistant conductive layer 123 can be 0.3, 0.32, 0.35, 0.38, 0.4, 0.42, 0.45, 0.48, 0.5, 0.52, 0.55, 0.58, 0.6, or any value within the range formed by any two of the above values.

[0097] In some embodiments, the conductivity of the second wear-resistant conductive layer 123 is 10 μS / cm to 500 mS / cm. In this way, the second wear-resistant conductive layer 123 has a high conductivity, which can effectively form a conduction between the contact part of the first electrode 120 and the power supply 140, facilitating the introduction of current into the material for heating the material. It can be understood that the conductivity of the second wear-resistant conductive layer 123 can be 10 μS / cm, 50 μS / cm, 100 μS / cm, 200 μS / cm, 500 μS / cm, 800 μS / cm, 1 mS / cm, 100 mS / cm, 200 mS / cm, 300 mS / cm, 400 mS / cm, 500 mS / cm, or any value within the range formed by any two of the above values.

[0098] As Figure 1 shown, in some embodiments, the second electrode 130 extends radially along the material channel 111; the number of the second electrodes 130 is multiple, and the multiple second electrodes 130 are arranged at intervals along the circumferential direction of the material channel 111. In this way, it is beneficial to make the electric field distribution in the cross-section of the material channel 111 more uniform, and beneficial to improving the uniformity of material graphitization.

[0099] Optionally, the second electrode 130 can be arranged at the middle and lower part of the furnace body 110, and the first electrode 120 and the second electrode 130 are arranged perpendicular to each other.

[0100] In some embodiments, the graphitization furnace 100 further includes a feeding unit, and the feeding unit includes a feed bin 151 and a feed pipe 152. The feed bin 151 is arranged above the furnace body 110, and the feed bin 151 is communicated with the material channel 111 in the furnace body 110 through the feed pipe 152, and is used to feed the material to be graphitized into the material channel 111. Optionally, a material cut-off valve 153 can also be arranged at the connection of the feed bin 151 and the feed pipe 152 to control the flow of the material in the material channel 111.

[0101] In some of these embodiments, the graphitization furnace 100 further includes an exhaust gas treatment unit 160, and the exhaust gas treatment unit 160 is communicated with the upper part of the material channel 111. The material entering the graphitization furnace 100 is a graphitizable carbonaceous material, such as petroleum coke, coal coke, and asphalt, etc. After the material enters the material channel 111 of the graphitization furnace 100 from the feeding unit, it is graphitized in the material channel 111 to obtain the negative electrode graphite material product. The volatile exhaust gas escaping during the graphitization of the material is collected in the upper part of the material channel 111 and then enters the exhaust gas treatment unit 160 for exhaust gas treatment.

[0102] In some of these embodiments, the graphitization furnace 100 further includes a cooling and discharging unit 170. The cooling and discharging unit 170 is arranged below the furnace body 110 and is communicated with the bottom of the material channel 111, and is mainly used for cooling the graphitized material and discharging the material at the same time. Specifically, as Figure 1 shown, the cooling and discharging unit 170 is provided with a water-cooled jacket, and the cooling medium can be circulating water. The graphitized material can be fully cooled through the cooling and discharging unit 170, and the cooled material can be discharged through a discharging system (not shown in the figure), and the discharging system can be a discharging screw.

[0103] An embodiment of the present application provides a battery production device (not shown in the figure). The battery production device includes the graphitization furnace 100 described above in the present application, and the graphitization furnace 100 is used for producing the negative electrode graphite material of the battery. By adopting the graphitization furnace 100 described above in the present application, the battery production device of the present application has a relatively high service life.

[0104] It can be understood that in addition to including the graphitization furnace 100 to produce the negative electrode graphite material of the battery, the battery production device may further include related devices for producing other materials of the battery.

[0105] The battery production device can be a battery production line. Multiple devices in the battery production line can be arranged in the same centralized place, or can also be arranged in separate different places.

[0106] It should be noted that in the above-mentioned various embodiments of the present application, only some structures in the graphitization furnace 100 are listed. In addition to the structures involved in the above-mentioned embodiments, the graphitization furnace 100 in the present application may further include other system structures of the graphitization furnace in the related art, for example, the electrical system of the electrode, the clamping system of the electrode, etc. The related technical solutions of each system can refer to the specific descriptions in the related art, and will not be specifically described herein.

[0107] To make the technical problems, technical solutions and beneficial effects solved by this application clearer, the following will further elaborate on this application in combination with embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of them. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits this application and its application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by this application.

[0108] For those technical or conditions not specified in the embodiments, they shall be carried out according to the technologies or conditions described in the literature in this field or according to the product specifications. For the reagents or instruments without indicating the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0109] Example 1:

[0110] (1) Preparation of the first electrode

[0111] Mix the second binder phenolic resin, the mixture of the second conductive agent graphene and carbon nanotubes (mass ratio 2:8), and the mixture of the second wear-resistant filler poly-L-glutamic acid and graphene (mass ratio 3:7) according to the mass ratio of 2.5:7.5:1, add the solvent ethanol, stir evenly to form a second slurry with a solid content of 70%, coat the above second slurry on the graphite substrate, and dry it at 90 °C to form a second wear-resistant conductive layer with a thickness of 20 μm. Among them, the thermal expansion coefficient of the second wear-resistant conductive layer is 20×10 -6 / °C, the number of grinding rotations is 6000 rotations, the friction coefficient is 0.3, and the conductivity is 400 mS / cm.

[0112] Mix the first binder epoxy resin, the mixture of the first conductive agent graphene oxide and aluminum powder (mass ratio 4:6), and the mixture of the first wear-resistant filler poly-L-glutamic acid and graphene (mass ratio 3:7) according to the mass ratio of 1:5:4, add the solvent ethanol, stir evenly to form a first slurry with a solid content of 70%, coat the above first slurry on the second wear-resistant conductive layer, and dry it at 90 °C to form a second wear-resistant conductive layer with a thickness of 30 μm, thereby obtaining the first electrode. Among them, the thermal expansion coefficient of the first wear-resistant conductive layer is 25×10 -6 / °C, the number of grinding rotations is 9000 rotations, the friction coefficient is 0.25, and the conductivity is 100 mS / cm.

[0113] (2) Electrode assembly

[0114] The above-mentioned first electrode is used as the positive electrode of the graphitization furnace and installed in the material channel of the vertical graphitization furnace, and the first electrode is arranged along the extension direction of the material channel; a graphite electrode is used as the negative electrode, installed in the middle and lower part of the furnace body of the graphitization furnace, extending into the material channel and arranged at intervals with the first electrode. The negative electrode is arranged horizontally, and the number of negative electrodes is 6. A plurality of negative electrodes are arranged at intervals along the circumferential direction of the material channel to assemble the graphitization furnace.

[0115] (3)Service life evaluation

[0116] When using the above graphitization furnace to produce graphite, when the furnace resistance reaches 1.2 mΩ, the first electrode is extended into the material channel until the furnace resistance is reduced to about 0.5 mΩ. After testing, when using this graphitization furnace to produce 300 tons of graphite, the extension length of the first electrode into the material channel is 16 cm.

[0117] It can be understood that under the condition of producing the same amount of graphite, if the extension length of the first electrode into the material channel is shorter, the longer the first electrode can be used, indicating that the service life of the first electrode is longer; on the contrary, if the extension length of the first electrode into the material channel is longer, the shorter the first electrode can be used, indicating that the service life of the first electrode is shorter.

[0118] Example 2:

[0119] (1)Preparation of the first electrode

[0120] The second binder bis-maleimide resin, the second conductive agent mixture of graphene and carbon nanotubes (mass ratio 4:6), and the second wear-resistant filler mixture of poly-L-glutamic acid and graphene (mass ratio 4:6) are mixed in a mass ratio of 2:7:1, and solvent ethanol is added and stirred evenly to form a second slurry with a solid content of 70%. The above second slurry is coated on the graphite substrate and dried at 90 °C to form a second wear-resistant conductive layer with a thickness of 20 μm. Among them, the thermal expansion coefficient of the second wear-resistant conductive layer is 30×10 -6 / °C, the number of grinding rotations is 6500 rotations, the friction coefficient is 0.35, and the conductivity is 350 mS / cm.

[0121] The first binder vinyl resin, the first conductive agent mixture of graphene oxide and aluminum powder (mass ratio 6:4), and the first wear-resistant filler mixture of poly-L-glutamic acid and graphene (mass ratio 4:6) are mixed in a mass ratio of 2:5:4, and solvent ethanol is added and stirred evenly to form a first slurry with a solid content of 70%. The above first slurry is coated on the second wear-resistant conductive layer and dried at 90 °C to form a second wear-resistant conductive layer with a thickness of 30 μm, thereby obtaining the first electrode. Among them, the thermal expansion coefficient of the first wear-resistant conductive layer is 30×10 -6 / °C, the number of grinding rotations is 10,000, the friction coefficient is 0.3, and the conductivity is 90 mS / cm.

[0122] (2) Electrode assembly

[0123] Use the above-mentioned first electrode as the positive electrode of the graphitization furnace, install it in the material channel of the vertical graphitization furnace, and set the first electrode along the extension direction of the material channel; use a graphite electrode as the negative electrode, install it in the middle and lower part of the furnace body of the graphitization furnace, extend it into the material channel and set it at intervals with the first electrode. The negative electrode is arranged horizontally, and the number of negative electrodes is 6. Multiple negative electrodes are arranged at intervals along the circumferential direction of the material channel to assemble the graphitization furnace.

[0124] (3) Service life evaluation

[0125] Use the above-mentioned graphitization furnace to produce graphite. When the furnace resistance reaches 1.2 mΩ, extend the first electrode into the material channel until the furnace resistance drops to about 0.5 mΩ. After testing, when using this graphitization furnace to produce 300 tons of graphite, the extension length of the first electrode into the material channel is 13 cm.

[0126] Example 3:

[0127] (1) Preparation of the first electrode

[0128] Mix the second binder cyanate resin, the second conductive agent mixture of graphene and graphene oxide (mass ratio 5:5), and the second wear-resistant filler mixture of poly-L-glutamic acid and graphene (mass ratio 6:4) in a mass ratio of 3:6:1, add the solvent ethanol, stir evenly to form a second slurry with a solid content of 70%. Coat the above second slurry on the graphite substrate and dry it at 90 °C to form a second wear-resistant conductive layer with a thickness of 20 μm. Among them, the thermal expansion coefficient of the second wear-resistant conductive layer is 28×10 -6 / °C, the number of grinding rotations is 7,000, the friction coefficient is 0.4, and the conductivity is 300 mS / cm.

[0129] Mix the first binder epoxy resin, the first conductive agent mixture of graphene oxide and aluminum powder (mass ratio 4:6), and the first wear-resistant filler mixture of poly-L-glutamic acid and graphene (mass ratio 5:5) in a mass ratio of 3:5:4, add the solvent ethanol, stir evenly to form a first slurry with a solid content of 70%. Coat the above first slurry on the second wear-resistant conductive layer and dry it at 90 °C to form a first wear-resistant conductive layer with a thickness of 30 μm, thereby obtaining the first electrode. Among them, the thermal expansion coefficient of the first wear-resistant conductive layer is 35×10 -6 / °C, the number of grinding rotations is 11,000, the friction coefficient is 0.4, and the conductivity is 80 mS / cm.

[0130] (2) Electrode assembly

[0131] Use the above-mentioned first electrode as the positive electrode of the graphitization furnace, install it in the material channel of the vertical graphitization furnace, and arrange the first electrode along the extension direction of the material channel; use a graphite electrode as the negative electrode, install it in the middle and lower part of the furnace body of the graphitization furnace, extend it into the material channel and set it at intervals with the first electrode. The negative electrode is arranged horizontally, and the number of negative electrodes is 6. The multiple negative electrodes are arranged at intervals along the circumferential direction of the material channel to assemble the graphitization furnace.

[0132] (3)Service life evaluation

[0133] When using the above graphitization furnace to produce graphite, when the furnace resistance reaches 1.2 mΩ, extend the first electrode into the material channel until the furnace resistance drops to about 0.5 mΩ. After testing, when using this graphitization furnace to produce 300 tons of graphite, the length that the first electrode extends into the material channel is 10 cm.

[0134] Comparative example 1:

[0135] (1)Electrode assembly

[0136] Use a graphite electrode as the positive electrode of the graphitization furnace, install it in the material channel of the vertical graphitization furnace, and arrange the first electrode along the extension direction of the material channel; use a graphite electrode as the negative electrode, install it in the middle and lower part of the furnace body of the graphitization furnace, extend it into the material channel and set it at intervals with the first electrode. The negative electrode is arranged horizontally, and the number of negative electrodes is 6. The multiple negative electrodes are arranged at intervals along the circumferential direction of the material channel to assemble the graphitization furnace.

[0137] (2)Service life evaluation

[0138] When using the above graphitization furnace to produce graphite, when the furnace resistance reaches 1.2 mΩ, extend the first electrode into the material channel until the furnace resistance drops to about 0.5 mΩ. After testing, when using this graphitization furnace to produce 300 tons of graphite, the length that the first electrode extends into the material channel is 210 cm.

[0139] Testing method:

[0140] (1)Thermal expansion coefficient test

[0141] Provide a graphite sample with a coating as a composite sample, and provide a graphite sample without a coating as a matrix sample; use precision measuring tools to measure the cross-sectional area A of the coating on the composite sample c and the cross-sectional area A of the matrix s ; in the same experimental environment, use a dilatometer to measure the thermal expansion coefficient α of the matrix sample s and the thermal expansion coefficient α of the composite sample b ; according to the formula α c = (αb A b -α s A s ) / A c Calculate the coefficient of thermal expansion of the coating, where A b is the total cross-sectional area of the composite sample.

[0142] (2)Abrasion rotation times test

[0143] Use a JM-1 type paint film abrasion tester to evaluate the anti-wear ability of the coating under the action of friction at 23±2°C and relative humidity of 50±5%. Specifically: Provide a circular graphite sample with a coating, install the sample on the abrasion tester, and use a trimmed rubber grinding wheel for sanding; during the test, observe the wear condition of the coating surface, and stop sanding when obvious wear or wear-through of the coating occurs, and record the abrasion rotation times at this time.

[0144] (3)Coefficient of friction test

[0145] Take two graphite samples with a coating of 200mm×80mm. Fix one sample on the test plate of a PCF-03 coefficient of friction tester with double-sided tape, and cut the other sample to the appropriate size according to the test requirements and fix it on a special slider; gently place the slider with the sample on the center of the sample on the test plate, insert the vertical pin at the front of the slider into the pin hole of the sensor to ensure that the device sensor returns to the origin; press the test button to start the test, and the instrument automatically records the data and calculates the coefficient of friction.

[0146] (4)Conductivity test

[0147] Provide a graphite sample with a coating, ensure that the coating surface is flat, clean, free of oil stains, impurities, etc. to ensure good contact between the probe and the coating; gently place the four probes of the four-probe tester on the coating surface so that the probes are in close contact with the coating and keep the spacing between the probes equal; turn on the tester, set an appropriate current value, pass current through the two outer probes by a constant current source, and measure the potential difference between the two middle probes at the same time; according to the measured current I, voltage U and probe spacing S, substitute them into the formula ρ = 2πSU / I to calculate the resistivity ρ; and then obtain the coating conductivity σ = 1 / ρ.

[0148] It should be noted that this application is not limited to the above embodiments. The above embodiments are only examples, and embodiments with the same composition and the same effect as the technical idea within the technical solution scope of this application are included in the technical scope of this application. In addition, within the scope of not departing from the gist of this application, various deformations that those skilled in the art can think of are imposed on the embodiments, and other ways constructed by combining some constituent elements in the embodiments are also included in the scope of this application.

Claims

1. A graphitization furnace, characterized in that, Comprising: A furnace body, within which a material passage is provided; A first electrode, arranged along the extending direction of the material passage and partially located within the material passage; the first electrode includes a substrate and a first wear-resistant conductive layer provided on the surface of the substrate; A second electrode, having a polarity opposite to that of the first electrode; the second electrode extends into the material passage and is arranged at an interval from the first electrode; The first wear-resistant conductive layer includes a first binder, a first conductive agent, and a first wear-resistant filler; the first binder includes one or more of phenolic resin, epoxy resin, bismaleimide resin, vinyl resin, and cyanate resin; the first conductive agent includes one or more of carbon materials, metal materials, and conductive polymers; the first wear-resistant filler includes one or more of poly-L-glutamic acid graphene composite, boron carbide powder, silicon carbide powder, metal powder, and alumina powder; the mass ratio of the first binder, the first conductive agent, and the first wear-resistant filler is 1 - 3:5 - 7:2 - 4; The friction coefficient of the first wear-resistant conductive layer is 0.2 - 0.4; the first electrode further includes a second wear-resistant conductive layer, which is provided between the substrate and the first wear-resistant conductive layer; the material of the second wear-resistant conductive layer includes a second binder, a second conductive agent, and a second wear-resistant filler; the mass ratio of the second binder, the second conductive agent, and the second wear-resistant filler is 2 - 4:4 - 8:1 - 2; the ratio of the thermal expansion coefficient of the second wear-resistant conductive layer to that of the first wear-resistant conductive layer is 1:1 - 1.

5.

2. The graphitization furnace according to claim 1, characterized in that, The carbon material includes one or more of graphene, graphene oxide, carbon fiber, and carbon nanotube.

3. The graphitization furnace according to claim 1, wherein The metal material includes one or more of silver powder, copper powder, silver fiber, and copper fiber.

4. The graphitization furnace according to any one of claims 1 to 3, characterized in that, The thickness of the first wear-resistant conductive layer is 30μm - 200μm.

5. The graphitization furnace according to any one of claims 1 to 3, characterized in that, The coefficient of thermal expansion of the first wear-resistant conductive layer is 10×10 -6 / °C to 100×10 -6 / °C.

6. The graphitization furnace according to any one of claims 1 to 3, characterized in that, The number of grinding rotations of the first wear-resistant conductive layer under the conditions of 23 ± 2°C and relative humidity of 50 ± 5% is 9000 - 11000 rotations.

7. The graphitization furnace according to any one of claims 1 to 3, characterized in that, The conductivity of the first wear-resistant conductive layer is 50μS / cm - 1000mS / cm.

8. The graphitization furnace according to any one of claims 1 to 3, characterized in that, The second binder includes one or more of phenolic resin, epoxy resin, bismaleimide resin, vinyl resin, and cyanate resin.

9. The graphitization furnace according to any one of claims 1 to 3, characterized in that, The second conductive agent includes one or more of carbon materials, metal materials, and conductive polymers.

10. The graphitization furnace according to any one of claims 1 to 3, characterized in that, The second wear-resistant filler includes one or more of poly-L-glutamic acid graphene composite, boron carbide powder, silicon carbide powder, metal powder, and alumina powder.

11. The graphitization furnace according to any one of claims 1 to 3, characterized in that, The ratio of the thickness of the second wear-resistant conductive layer to that of the first wear-resistant conductive layer is 1:1 - 8.

7.

12. The graphitization furnace according to claim 11, characterized in that, The ratio of the thickness of the second wear-resistant conductive layer to that of the first wear-resistant conductive layer is 1:1 - 4.

3.

13. The graphitization furnace according to any one of claims 1 to 3 and 12, characterized in that, The thickness of the second wear-resistant conductive layer is 20μm - 40μm.

14. The graphitization furnace according to any one of claims 1 to 3 and 12, characterized in that, The ratio of the thermal expansion coefficient of the second wear-resistant conductive layer to that of the first wear-resistant conductive layer is 1:1 - 1.

2.

15. The graphitization furnace according to any one of claims 1 to 3 and 12, characterized in that, The coefficient of thermal expansion of the second wear-resistant conductive layer is 5×10 -6 / °C to 30×10 -6 / °C.

16. The graphitization furnace according to any one of claims 1 to 3 and 12, characterized in that, The number of grinding rotations of the second wear-resistant conductive layer under the conditions of 23 ± 2°C and relative humidity of 50 ± 5% is 6000 - 8000 rotations.

17. The graphitization furnace according to any one of claims 1 to 3 and 12, characterized in that, The friction coefficient of the second wear-resistant conductive layer is 0.3 - 0.

6.

18. The graphitization furnace according to any one of claims 1 to 3 and 12, characterized in that, The conductivity of the second wear-resistant conductive layer is 10 μS / cm to 500 μS / cm.

19. The graphitization furnace according to any one of claims 1 to 3 and 12, characterized in that, The second electrode extends radially along the material channel.

20. The graphitization furnace according to any one of claims 1 to 3 and 12, characterized in that, The number of the second electrodes is multiple, and the multiple second electrodes are arranged at intervals along the circumferential direction of the material channel.

21. The graphitization furnace according to any one of claims 1 to 3 and 12, characterized in that, The first electrode is a positive electrode, and the second electrode is a negative electrode.

22. A battery production device, characterized in that, Comprising the graphitization furnace according to any one of claims 1 to 21, the graphitization furnace is used for producing graphite materials for batteries.

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