Modified carbon-phosphorus composite material as well as preparation method and application thereof

Abstract

The invention relates to the field of preparation and application of carbon-phosphorus composite materials, in particular to a modified carbon-phosphorus composite material and a preparation method and application thereof. 0.05-3 parts by weight of a conductive polymer; 0.05-5 parts by weight of an emulsifier; 0.2-2 parts by weight of a low surface energy modifier; according to the low-surface-energy composite material, the weight of the low-surface-energy composite material is increased by (3.987-3.993)% when the low-surface-energy composite material is placed in air for 30 days on the basis of the initial weight of the low-surface-energy composite material, the bonding forming agent and the low-surface-energy modifier are added, and all the components have a synergistic effect, so that the low-surface-energy composite material is prepared. The prepared modified carbon-phosphorus composite material has the advantages of being small in health harm, not prone to adhesion, resistant to oxidation and high in safety.

Description

Technical Field

[0001] This invention relates to the field of preparation and application of carbon-phosphorus composite materials, and particularly to a modified carbon-phosphorus composite material, its preparation method, and its application. Background Technology

[0002] Currently, carbon-phosphorus composite particles are typically micron-sized. However, micron-sized carbon-phosphorus composite particles present many problems during use. First, from a health hazard perspective, micron-sized carbon-phosphorus composite particles are highly prone to generating dust pollution during production, processing, and use. According to research data in the field of occupational health and safety, operators who are exposed to dusty environments for extended periods, after inhaling particulate matter with a diameter of less than 10 μm (PM10), can allow these particles to penetrate deep into the respiratory tract, easily causing respiratory inflammation, decreased lung function, and other health problems. Fine particulate matter with a diameter of less than 2.5 μm (PM2.5) can even penetrate the alveoli and enter the circulatory system, causing irreversible damage to the cardiovascular and nervous systems. Secondly, from the perspective of easy adhesion, micron-sized carbon-phosphorus composite particles, due to their small particle size, have a large specific surface area and high surface energy, making them highly susceptible to electrostatic adsorption. In the conveying system, frequent friction between the material particles and the pipe wall generates static electricity, causing the particle surface to become charged. The charged particles then exert Coulomb forces with the pipe wall, leading to particle adhesion. This can cause measurement errors in metering equipment, resulting in inaccurate material proportions and affecting product quality stability. Thirdly, from the perspective of easy oxidation, the large specific surface area of ​​micron-sized carbon-phosphorus composite particles also increases their contact area with air, significantly improving their reactivity. Furthermore, phosphorus is chemically reactive and easily oxidized in air, forming phosphorus oxides. Finally, from a safety perspective, during processing, operations such as stirring can generate heat from friction, potentially causing localized temperature increases. If these temperatures reach the particle's auto-ignition point, combustion or even explosion is highly likely. During transportation, bumps and collisions are unavoidable, leading to intense friction between particles and generating electrostatic sparks, which can cause fires or explosions.

[0003] CN116759556A discloses a method for preparing a phosphorus-carbon composite anode material, an anode, and a lithium-ion battery. The preparation method includes: A) mixing phosphorus and carbon materials to obtain a mixture; then pre-activating the mixture to obtain a pre-activated mixture; the pre-activation treatment causes the mixture to form at least one of surface oxidation, amination, sulfonation, and defects; the pre-activation treatment method is at least one of plasma treatment, acid oxidation treatment, and chemical grafting; B) mixing and crushing the pre-activated mixture with water and a dispersant to obtain a primary slurry; C) mixing and milling the primary slurry with a dispersing solvent to obtain a secondary slurry; D) drying the secondary slurry to obtain a phosphorus-carbon composite anode material. However, the particles of this carbon-phosphorus composite material are at the micron level, which means that it has the above-mentioned problems of high health hazards, easy adhesion, easy oxidation, and low safety. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a modified carbon-phosphorus composite material, its preparation method, and its application. By adding an adhesive molding agent and a low surface energy modifier, as well as the synergistic effect of each component, the modified carbon-phosphorus composite material prepared thereby has the advantages of low health hazards, non-adhesion, oxidation resistance, and high safety.

[0005] This invention provides a modified carbon-phosphorus composite material, the raw materials of which include the following components: 100 parts by weight of carbon-phosphorus composite material; Conductive polymer 0.05-3 parts by weight; Emulsifier 0.05-5 parts by weight; 0.2-2 parts by weight of low surface energy modifier; Adhesive molding agent 0.25-8 parts by weight, Based on the initial weight of the material, when the material is left in the air for 30 days, the weight gain of the material is (3.987-3.993)%. Furthermore, the material is in the centimeter range. Furthermore, the preparation method of the carbon-phosphorus composite material is as follows: porous carbon and red phosphorus are placed alternately in a quartz tube, then the quartz tube is evacuated, and then the vacuum quartz tube is placed in a tube furnace for heating. After the red phosphorus sublimates, it is deposited into the porous carbon. After cooling, the composite material is obtained.

[0006] Furthermore, the mass ratio of the porous carbon to red phosphorus is 1:(1-3).

[0007] Furthermore, the heating temperature is 450-550℃, and the heating time is 8-24h.

[0008] Furthermore, the carbon-phosphorus composite material serves as the basic framework, providing the fundamental properties of the modified carbon-phosphorus composite material. Carbon gives the modified carbon-phosphorus composite material chemical stability and mechanical strength, while phosphorus participates in electrochemical reactions.

[0009] Furthermore, the conductive polymer is poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate, and / or polyaniline.

[0010] Furthermore, the conjugated structure of poly(3,4-ethylenedioxythiophene) gives it intrinsic conductivity, but it needs to be compounded with polystyrene sulfonate and doped with the polystyrene sulfonate to form water-soluble poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate, thereby enabling processability.

[0011] Furthermore, the polyaniline is made conductive by protic acid doping, wherein the protic acid includes hydrochloric acid, sulfuric acid, camphor sulfonic acid, or toluene sulfonic acid.

[0012] Furthermore, the conductive polymer is used for electron transport, which can improve the conductivity of the modified carbon-phosphorus composite material.

[0013] Furthermore, the emulsifier is one or more of polyvinyl alcohol, polyethylene glycol, sodium hydroxymethyl cellulose, and sodium dodecylbenzene sulfonate.

[0014] Furthermore, the emulsifier is used to reduce the surface tension of the system, so that the components are uniformly dispersed in water and avoid agglomeration, thereby making the modified carbon-phosphorus composite material have uniform properties. In addition, the emulsifier is also used to improve interfacial compatibility, which can enhance the bonding force between the components, thereby improving the overall performance of the modified carbon-phosphorus composite material.

[0015] Furthermore, the low surface energy modifier is one or more of polydimethylsiloxane, polyvinylsiloxane, polymethylsiloxane, phenyl polytrimethylsiloxane, and polytetrafluoroethylene.

[0016] Furthermore, the low surface energy modifier is used to prevent oxygen in the air from reacting with the phosphorus element, wherein the phosphorus... The element is chemically reactive and easily oxidized in the air to form phosphorus oxides, which in turn changes the chemical composition and structure of the material, thus affecting its performance. The low surface energy modifier can form a coating layer, which acts as a barrier to prevent the air from directly contacting the phosphorus element, thus preventing the phosphorus element from being oxidized and maintaining the stability of the material.

[0017] Furthermore, the adhesive molding agent is one or more of polyacrylic acid, sodium polyacrylate, and lithium polyacrylate.

[0018] Furthermore, the adhesive molding agent is viscous and can adhere to the surface of micron-sized particles, bonding individual or small clusters of the micron-sized particles together.

[0019] Furthermore, the particle size of the material is on the order of centimeters. This invention provides a method for preparing a modified carbon-phosphorus composite material, the method comprising the following steps: Step 1: Primary mixing: First, take parts by weight of the carbon-phosphorus composite material and disperse it in water, then add parts by weight of the conductive polymer and parts by weight of the emulsifier to obtain a primary mixing solution; Step 2: Secondary mixing: Add parts by weight of the low surface energy modifier to the primary mixing solution in Step 1 to obtain a secondary mixing solution; Step 3: Three-stage mixing: First, add the adhesive molding agent in parts by weight to the secondary mixing solution in step 2 to obtain a three-stage mixing solution. Then, perform solid-liquid separation treatment on the three-stage mixing solution to obtain a filter cake. Step 4: Pressurization and drying: First, the filter cake is injected into the mold and the mold is pressurized to obtain a pressed blank. Then, the pressed blank is dried to obtain the modified carbon-phosphorus composite material.

[0020] Further, in step 1, the mass ratio of the carbon-phosphorus composite material to the water is 1:(2-5).

[0021] Further, in steps 1, 2, and 3, after adding parts by weight of the conductive polymer, parts by weight of the emulsifier, parts by weight of the low surface energy modifier, and parts by weight of the adhesive molding agent, the mixture is stirred for 5-30 minutes.

[0022] Furthermore, in step 3, the solid-liquid separation process is pressure filtration or centrifugation.

[0023] Furthermore, in step 4, the pressurization pressure is 0.2-0.8 MPa.

[0024] Furthermore, in step 4, the drying atmosphere is nitrogen or argon.

[0025] Furthermore, in step 4, the drying temperature is 100-150℃, the relative vacuum degree is <-0.08 MPa, and the time is 12-36h.

[0026] The present invention provides a battery comprising the modified carbon-phosphorus composite material.

[0027] Furthermore, the battery includes a lithium battery or a sodium battery.

[0028] Beneficial effects of the present invention 1. From the perspective of health hazards, micron-sized carbon-phosphorus composite material particles are prone to dust pollution during production, processing and use. The modified carbon-phosphorus composite material of the present invention, by adding a binder and molding agent, connects the micron-sized particles to form centimeter-sized particles, which significantly increases the particle size and thus reduces dust pollution.

[0029] 2. From the perspective of easy adhesion, micron-sized carbon-phosphorus composite material particles have a large specific surface area and high surface energy due to their small particle size, making them extremely prone to electrostatic adsorption. This can cause measurement errors in metering equipment and lead to inaccurate material proportions. The modified carbon-phosphorus composite material of this invention forms a coating layer on the particle surface by adding a low surface energy modifier, reducing the particle surface energy and decreasing electrostatic adsorption. At the same time, the adhesive molding agent can reduce the dispersion friction between particles through the bonding effect, thereby avoiding the problem of particles adhering to the pipe wall due to static electricity. This ensures the accuracy of material proportions and improves the stability of product quality.

[0030] 3. From the perspective of easy oxidation, micron-sized carbon-phosphorus composite material particles have a large specific surface area, so the contact area with air is also large. This significantly improves the reactivity of the material particles. In addition, phosphorus is chemically active and is easily oxidized in air to form phosphorus oxides. The modified carbon-phosphorus composite material of the present invention can form a coating layer by adding a low surface energy modifier, which acts as a barrier to prevent air from directly contacting phosphorus and prevent phosphorus from being oxidized, thereby maintaining the stability of the material.

[0031] 4. From a safety perspective, the modified carbon-phosphorus composite material of the present invention connects micron-sized particles to form centimeter-sized particles by adding a binder and molding agent. Compared with micron-sized particles, centimeter-sized particles can reduce the frictional heat generated between particles, thereby reducing the possibility of local temperature rising to the auto-ignition point. At the same time, the large-diameter particles can reduce the intensity of friction caused by bumps and collisions during transportation, thereby reducing the risk of static electricity and improving the safety of storage and transportation. Attached Figure Description

[0032] Figure 1 This is a particle appearance diagram of the modified carbon-phosphorus composite material in Example 1; Figure 2 The particle appearance diagram of the carbon-phosphorus composite material in Comparative Example 1 is shown. Figure 3 This is a comparison chart of the weight gain of the materials in Example 1 and Comparative Example 1. Detailed Implementation

[0033] Example 1 Modified carbon-phosphorus composite material sample 1 The raw materials include the following components: 100 parts by weight of carbon-phosphorus composite material; 3 parts by weight of conductive polymer solution; 5 parts by weight of emulsifier; 2 parts by weight of low surface energy modifier; and 8 parts by weight of adhesive molding agent. Based on the initial weight of the material, after being left in air for 30 days, the weight gain of the material is 3.993%. The particle appearance of the material is as follows: Figure 1 As shown.

[0034] The preparation method of carbon-phosphorus composite material is as follows: porous carbon and red phosphorus are placed alternately in a quartz tube, then the quartz tube is evacuated, and then the vacuum quartz tube is placed in a tube furnace for heating. After the red phosphorus sublimates, it is deposited into the porous carbon. After cooling, the carbon-phosphorus composite material is obtained. The mass ratio of porous carbon to red phosphorus is 1:3, the heating temperature is 550℃, and the heating time is 24h. The carbon-phosphorus composite material serves as the basic framework, providing the fundamental properties for the modified carbon-phosphorus composite material. Carbon contributes to the chemical stability and mechanical strength of the modified carbon-phosphorus composite material, while phosphorus participates in the electrochemical reaction.

[0035] The conductive polymer is poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate. The conjugated structure of poly(3,4-ethylenedioxythiophene) endows it with intrinsic conductivity, but it needs to be compounded with polystyrene sulfonate and doped with polystyrene sulfonate to form water-soluble poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate, thus enabling processability. The conductive polymer is used for electron transport and can improve the conductivity of modified carbon-phosphorus composites.

[0036] The emulsifier is polyvinyl alcohol. The emulsifier is used to reduce the surface tension of the system, so that the components are uniformly dispersed in water and avoid agglomeration, thereby making the modified carbon-phosphorus composite material have uniform properties. In addition, the emulsifier is also used to improve interfacial compatibility and enhance the bonding force between the components, thereby improving the overall performance of the modified carbon-phosphorus composite material.

[0037] The low surface energy modifier is polydimethylsiloxane. It is used to prevent oxygen in the air from reacting with phosphorus. Phosphorus is chemically reactive and is easily oxidized in the air to form phosphorus oxides, which in turn changes the chemical composition and structure of the material, thus affecting its performance. The low surface energy modifier can form a coating layer, which acts as a barrier to prevent direct contact between air and phosphorus, thus preventing phosphorus from being oxidized and maintaining the stability of the material.

[0038] The adhesive molding agent is polyacrylic acid. The adhesive molding agent is sticky and can adhere to the surface of micron-sized particles, bonding individual or small clusters of micron-sized particles together. Through intermolecular forces, including van der Waals forces or hydrogen bonds, the micron-sized particles are connected to form centimeter-sized particles.

[0039] Preparation method of sample 1 Step 1: Primary mixing: First, take a weight portion of carbon-phosphorus composite material and disperse it in water, then add a weight portion of conductive polymer and a weight portion of emulsifier to obtain a primary mixing solution. The ratio of carbon-phosphorus composite material to water is 1:5. After adding the weight portion of conductive polymer and the weight portion of emulsifier, stir for 30 minutes.

[0040] Step 2: Secondary mixing: Add parts by weight of low surface energy modifier to the primary mixing solution in Step 1 and stir for 30 minutes to obtain a secondary mixing solution.

[0041] Step 3: Three-stage mixing: First, add the amount of binder and molding agent by weight to the two-stage mixing solution in Step 2 and stir for 30 minutes to obtain a three-stage mixing solution. Then, perform pressure filtration on the three-stage mixing solution to obtain a filter cake.

[0042] Step 4: Pressurization and drying: First, the filter cake is injected into the mold and the mold is pressurized to obtain a pressed blank. Then, the pressed blank is dried to obtain the modified carbon-phosphorus composite material. The pressurization pressure is 0.8 MPa, the drying atmosphere is nitrogen, the drying temperature is 150℃, the relative vacuum degree is <-0.08 MPa, and the time is 36h.

[0043] Lithium batteries, including sample 1 mentioned above.

[0044] Example 2 Modified carbon-phosphorus composite sample 2 The raw materials include the following components: 100 parts by weight of carbon-phosphorus composite material; 0.05 parts by weight of conductive polymer; 0.05 parts by weight of emulsifier; 0.2 parts by weight of low surface energy modifier; and 0.25 parts by weight of adhesive molding agent. Based on the initial weight of the material, after being left in air for 30 days, the weight gain of the material is 3.988%. The particle appearance of the material is similar to... Figure 1 resemblance.

[0045] The preparation method of carbon-phosphorus composite material is as follows: porous carbon and red phosphorus are placed alternately in a quartz tube, then the quartz tube is evacuated, and then the vacuum quartz tube is placed in a tube furnace for heating. After the red phosphorus sublimates, it is deposited into the porous carbon. After cooling, the composite material is obtained. The mass ratio of porous carbon to red phosphorus is 1:1, the heating temperature is 450℃, and the heating time is 8 hours. The carbon-phosphorus composite material serves as the basic framework, providing the fundamental properties for the modified carbon-phosphorus composite material. Carbon contributes to the chemical stability and mechanical strength of the modified carbon-phosphorus composite material, while phosphorus participates in the electrochemical reaction.

[0046] The conductive polymer is polyaniline, which becomes conductive through protic acid doping. Protic acids include hydrochloric acid, sulfuric acid, camphor sulfonic acid, or toluene sulfonic acid. The conductive polymer is used for electron transport and can improve the conductivity of modified carbon-phosphorus composites.

[0047] The emulsifier is polyethylene glycol. The emulsifier is used to reduce the surface tension of the system, so that the components are uniformly dispersed in water and avoid agglomeration, thereby making the modified carbon-phosphorus composite material have uniform properties. In addition, the emulsifier is also used to improve interfacial compatibility and enhance the bonding force between the components, thereby improving the overall performance of the modified carbon-phosphorus composite material.

[0048] The low surface energy modifier is polyvinylsiloxane. It is used to prevent oxygen in the air from reacting with phosphorus. Phosphorus is chemically reactive and is easily oxidized in the air to form phosphorus oxides, which in turn changes the chemical composition and structure of the material, thus affecting its performance. The low surface energy modifier can form a coating layer, which acts as a barrier to prevent air from directly contacting phosphorus and prevent phosphorus from being oxidized, thereby maintaining the stability of the material.

[0049] The adhesive molding agent is sodium polyacrylate. The adhesive molding agent is sticky and can adhere to the surface of micron-sized particles, bonding individual or small clusters of micron-sized particles together. Through intermolecular forces, including van der Waals forces or hydrogen bonds, the micron-sized particles are connected to form centimeter-sized particles.

[0050] Preparation method of sample 2 Step 1: Primary mixing: First, take a weight portion of carbon-phosphorus composite material and disperse it in water, then add a weight portion of conductive polymer and a weight portion of emulsifier to obtain a primary mixing solution. The ratio of carbon-phosphorus composite material to water is 1:2. After adding the weight portion of conductive polymer and the weight portion of emulsifier, stir for 5 minutes.

[0051] Step 2: Secondary mixing: Add parts by weight of low surface energy modifier to the primary mixing solution in Step 1 and stir for 5 minutes to obtain a secondary mixing solution.

[0052] Step 3: Three-stage mixing: First, add the amount of binder and molding agent by weight to the two-stage mixing solution in Step 2 and stir for 5 minutes to obtain a three-stage mixing solution. Then, centrifuge the three-stage mixing solution to obtain a filter cake.

[0053] Step 4: Pressurization and drying: First, the filter cake is injected into the mold and the mold is pressurized to obtain a compact. Then, the compact is dried to obtain the modified carbon-phosphorus composite material. The pressurization pressure is 0.2 MPa, the drying atmosphere is argon, the drying temperature is 100℃, the relative vacuum degree is <-0.08 MPa, and the time is 12h.

[0054] Sodium batteries, including sample 2 mentioned above.

[0055] Example 3 Modified carbon-phosphorus composite sample 3 The raw materials include the following components: 100 parts by weight of carbon-phosphorus composite material; 1.5 parts by weight of conductive polymer; 2.5 parts by weight of emulsifier; 1 part by weight of low surface energy modifier; and 4 parts by weight of adhesive molding agent. Based on the initial weight of the material, after being left in air for 30 days, the weight gain of the material is 3.990%. The particle appearance of the material is similar to... Figure 1 resemblance.

[0056] The preparation method of carbon-phosphorus composite material is as follows: porous carbon and red phosphorus are placed alternately in a quartz tube, then the quartz tube is evacuated, and then the vacuum quartz tube is placed in a tube furnace for heating. After the red phosphorus sublimates, it is deposited into the porous carbon. After cooling, the composite material is obtained. The mass ratio of porous carbon to red phosphorus is 1:2, the heating temperature is 500℃, and the heating time is 16h. The carbon-phosphorus composite material serves as the basic framework, providing the fundamental properties for the modified carbon-phosphorus composite material. Carbon contributes to the chemical stability and mechanical strength of the modified carbon-phosphorus composite material, while phosphorus participates in the electrochemical reaction.

[0057] The conductive polymers are poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate and polyaniline. The conjugated structure of poly(3,4-ethylenedioxythiophene) endows it with intrinsic conductivity, but it needs to be compounded with polystyrene sulfonate and doped with the polystyrene sulfonate to form water-soluble poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate, thus enabling processability. Polyaniline becomes conductive through protic acid doping, including hydrochloric acid, sulfuric acid, camphor sulfonic acid, or toluene sulfonic acid. These conductive polymers are used for electron transport and can improve the conductivity of modified carbon-phosphorus composites.

[0058] The emulsifier is sodium carboxymethyl cellulose. The emulsifier is used to reduce the surface tension of the system, so that the components are uniformly dispersed in water and avoid agglomeration, thereby making the modified carbon-phosphorus composite material have uniform properties. In addition, the emulsifier is also used to improve interfacial compatibility and enhance the bonding force between the components, thereby improving the overall performance of the modified carbon-phosphorus composite material.

[0059] The low surface energy modifier is polymethylsiloxane. It is used to prevent oxygen in the air from reacting with phosphorus. Phosphorus is chemically reactive and is easily oxidized in the air to form phosphorus oxides, which in turn changes the chemical composition and structure of the material, thus affecting its performance. The low surface energy modifier can form a coating layer, which acts as a barrier to prevent air from directly contacting phosphorus and prevent phosphorus from being oxidized, thereby maintaining the stability of the material.

[0060] The adhesive molding agent is lithium polyacrylate. The adhesive molding agent is sticky and can adhere to the surface of micron-sized particles, bonding individual or small clusters of micron-sized particles together. Through intermolecular forces, including van der Waals forces or hydrogen bonds, the micron-sized particles are connected to form centimeter-sized particles.

[0061] Preparation method of sample 3 Step 1: Primary mixing: First, take a weight portion of carbon-phosphorus composite material and disperse it in water, then add a weight portion of conductive polymer and a weight portion of emulsifier to obtain a primary mixing solution. The ratio of carbon-phosphorus composite material to water is 1:3. After adding the weight portion of conductive polymer and the weight portion of emulsifier, stir for 20 minutes.

[0062] Step 2: Secondary mixing: Add parts by weight of low surface energy modifier to the primary mixing solution in Step 1 and stir for 20 minutes to obtain a secondary mixing solution.

[0063] Step 3: Three-stage mixing: First, add the amount of binder and molding agent by weight to the two-stage mixing solution in Step 2 and stir for 20 minutes to obtain a three-stage mixing solution. Then, perform pressure filtration on the three-stage mixing solution to obtain a filter cake.

[0064] Step 4: Pressurization and drying: First, inject the filter cake into the mold and pressurize the mold to obtain a pressed blank. Then, dry the pressed blank to obtain the modified carbon-phosphorus composite material. The pressurization pressure is 0.5 MPa, the drying atmosphere is nitrogen, the drying temperature is 125℃, the relative vacuum degree is <-0.08 MPa, and the time is 24h.

[0065] Sodium batteries, including sample 3 mentioned above.

[0066] Example 4 Modified carbon-phosphorus composite sample 4 The raw materials include the following components: 100 parts by weight of carbon-phosphorus composite material; 2.5 parts by weight of conductive polymer; 2 parts by weight of emulsifier; 1 part by weight of low surface energy modifier; and 3 parts by weight of adhesive molding agent. Based on the initial weight of the material, after being left in air for 30 days, the weight gain of the material is 3.987%. The particle appearance of the material is similar to... Figure 1 resemblance.

[0067] The preparation method of carbon-phosphorus composite material is as follows: porous carbon and red phosphorus are placed alternately in a quartz tube, then the quartz tube is evacuated, and then the vacuum quartz tube is placed in a tube furnace for heating. After the red phosphorus sublimates, it is deposited into the porous carbon. After cooling, the composite material is obtained. The mass ratio of porous carbon to red phosphorus is 1:2, the heating temperature is 500℃, and the heating time is 16h. The carbon-phosphorus composite material serves as the basic framework, providing the fundamental properties for the modified carbon-phosphorus composite material. Carbon contributes to the chemical stability and mechanical strength of the modified carbon-phosphorus composite material, while phosphorus participates in the electrochemical reaction.

[0068] The conductive polymers are poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate and polyaniline. The conjugated structure of poly(3,4-ethylenedioxythiophene) endows it with intrinsic conductivity, but it needs to be compounded with polystyrene sulfonate and doped with the polystyrene sulfonate to form water-soluble poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate, thus enabling processability. Polyaniline becomes conductive through protic acid doping, including hydrochloric acid, sulfuric acid, camphor sulfonic acid, or toluene sulfonic acid. These conductive polymers are used for electron transport and can improve the conductivity of modified carbon-phosphorus composites.

[0069] The emulsifier is sodium dodecylbenzene sulfonate. The emulsifier is used to reduce the surface tension of the system, so that the components are uniformly dispersed in water and avoid agglomeration, thereby making the modified carbon-phosphorus composite material have uniform properties. In addition, the emulsifier is also used to improve interfacial compatibility and enhance the bonding force between the components, thereby improving the overall performance of the modified carbon-phosphorus composite material.

[0070] The low surface energy modifier is phenyl polytrimethylsiloxane. It is used to prevent oxygen in the air from reacting with phosphorus. Phosphorus is chemically reactive and is easily oxidized in the air to form phosphorus oxides, which in turn changes the chemical composition and structure of the material and affects its performance. The low surface energy modifier can form a coating layer, which acts as a barrier to prevent air from directly contacting phosphorus and prevent phosphorus from being oxidized, thereby maintaining the stability of the material.

[0071] The adhesive molding agent is polyacrylic acid and sodium polyacrylate. The adhesive molding agent is sticky and can adhere to the surface of micron-sized particles, bonding individual or small clusters of micron-sized particles together. Through intermolecular forces, including van der Waals forces or hydrogen bonds, the micron-sized particles are connected to form centimeter-sized particles.

[0072] Preparation method of sample 4 Step 1: Primary mixing: First, take parts by weight of carbon-phosphorus composite material and disperse it in water, then add parts by weight of conductive polymer and parts by weight of emulsifier to obtain a primary mixing solution. The ratio of carbon-phosphorus composite material to water is 1:3. After adding parts by weight of conductive polymer and parts by weight of emulsifier, stir for 16 minutes.

[0073] Step 2: Secondary mixing: Add parts by weight of low surface energy modifier to the primary mixing solution in Step 1 and stir for 15 minutes to obtain a secondary mixing solution.

[0074] Step 3: Three-stage mixing: First, add the amount of binder and molding agent by weight to the two-stage mixing solution in Step 2 and stir for 12 minutes to obtain a three-stage mixing solution. Then, centrifuge the three-stage mixing solution to obtain a filter cake.

[0075] Step 4: Pressurization and drying: First, the filter cake is injected into the mold and the mold is pressurized to obtain a pressed blank. Then, the pressed blank is dried to obtain the modified carbon-phosphorus composite material. The pressurization pressure is 0.4 MPa, the drying atmosphere is nitrogen, the drying temperature is 115℃, the relative vacuum degree is <-0.08 MPa, and the time is 15h.

[0076] Lithium batteries, including sample 4 mentioned above.

[0077] Example 5 Modified carbon-phosphorus composite material sample 5 The raw materials include the following components: 100 parts by weight of carbon-phosphorus composite material; 2 parts by weight of conductive polymer; 1 part by weight of emulsifier; 0.75 parts by weight of low surface energy modifier; and 1.5 parts by weight of adhesive molding agent. Based on the initial weight of the material, after being left in air for 30 days, the weight gain of the material is 3.992%. The particle appearance of the material is similar to... Figure 1 resemblance.

[0078] The preparation method of carbon-phosphorus composite material is as follows: porous carbon and red phosphorus are placed alternately in a quartz tube, then the quartz tube is evacuated, and then the vacuum quartz tube is placed in a tube furnace for heating. After the red phosphorus sublimates, it is deposited into the porous carbon. After cooling, the carbon-phosphorus composite material is obtained. The mass ratio of porous carbon to red phosphorus is 1:1.8, the heating temperature is 460℃, and the heating time is 14h. The carbon-phosphorus composite material serves as the basic framework, providing the basic properties of the modified carbon-phosphorus composite material. Carbon gives the modified carbon-phosphorus composite material chemical stability and mechanical strength, while phosphorus participates in the electrochemical reaction.

[0079] The conductive polymer is poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate. The conjugated structure of poly(3,4-ethylenedioxythiophene) endows it with intrinsic conductivity, but it needs to be compounded with polystyrene sulfonate and doped with polystyrene sulfonate to form water-soluble poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate, thus enabling processability. The conductive polymer is used for electron transport and can improve the conductivity of modified carbon-phosphorus composites.

[0080] The emulsifiers are polyvinyl alcohol and polyethylene glycol. The emulsifiers are used to reduce the surface tension of the system, so that the components are uniformly dispersed in water and avoid agglomeration, thereby making the modified carbon-phosphorus composite material have uniform properties. In addition, the emulsifiers are also used to improve interfacial compatibility and enhance the bonding force between the components, thereby improving the overall performance of the modified carbon-phosphorus composite material.

[0081] Low surface energy modifiers are polydimethylsiloxane and polyvinylsiloxane. Low surface energy modifiers are used to prevent oxygen in the air from reacting with phosphorus. Phosphorus is chemically reactive and is easily oxidized in the air to form phosphorus oxides, which in turn changes the chemical composition and structure of the material, thus affecting its performance. Low surface energy modifiers can form a coating layer, which acts as a barrier to prevent air from directly contacting phosphorus, preventing phosphorus from being oxidized, and thus maintaining the stability of the material.

[0082] The adhesive molding agent is polyacrylic acid and sodium polyacrylate. The adhesive molding agent is sticky and can adhere to the surface of micron-sized particles, bonding individual or small clusters of micron-sized particles together. Through intermolecular forces, including van der Waals forces or hydrogen bonds, the micron-sized particles are connected to form centimeter-sized particles.

[0083] Preparation method of sample 5 Step 1: Primary mixing: First, take a weight portion of carbon-phosphorus composite material and disperse it in water, then add a weight portion of conductive polymer and a weight portion of emulsifier to obtain a primary mixing solution. The ratio of carbon-phosphorus composite material to water is 1:3.5. After adding the weight portion of conductive polymer and the weight portion of emulsifier, stir for 13 minutes.

[0084] Step 2: Secondary mixing: Add parts by weight of low surface energy modifier to the primary mixing solution in Step 1 and stir for 12 minutes to obtain a secondary mixing solution.

[0085] Step 3: Three-stage mixing: First, add the amount of binder and molding agent by weight to the two-stage mixing solution in Step 2 and stir for 16 minutes to obtain a three-stage mixing solution. Then, filter the three-stage mixing solution by pressure to obtain a filter cake.

[0086] Step 4: Pressurization and drying: First, the filter cake is injected into the mold and pressurized to obtain a pressed blank. Then, the pressed blank is dried to obtain the modified carbon-phosphorus composite material. The pressurization pressure is 0.6 MPa, the drying atmosphere is nitrogen, the drying temperature is 120℃, the relative vacuum degree is <-0.08 MPa, and the time is 12h.

[0087] Lithium batteries, including sample 5 mentioned above.

[0088] Example 6 Modified carbon-phosphorus composite material sample 6 The raw materials include the following components: 100 parts by weight of carbon-phosphorus composite material; 0.48 parts by weight of conductive polymer; 0.35 parts by weight of emulsifier; 0.55 parts by weight of low surface energy modifier; and 1.3 parts by weight of adhesive molding agent. Based on the initial weight of the material, after being left in air for 30 days, the weight gain of the material was 3.991%. The particle appearance of the material is similar to... Figure 1 resemblance.

[0089] The preparation method of carbon-phosphorus composite material is as follows: porous carbon and red phosphorus are placed alternately in a quartz tube, then the quartz tube is evacuated, and then the vacuum quartz tube is placed in a tube furnace for heating. After the red phosphorus sublimates, it is deposited into the porous carbon. After cooling, the carbon-phosphorus composite material is obtained. The mass ratio of porous carbon to red phosphorus is 1:1.6, the heating temperature is 455℃, and the heating time is 20h. The carbon-phosphorus composite material serves as the basic framework, providing the basic properties of the modified carbon-phosphorus composite material. Carbon gives the modified carbon-phosphorus composite material chemical stability and mechanical strength, while phosphorus participates in the electrochemical reaction.

[0090] The conductive polymer is polyaniline, which becomes conductive through protic acid doping. Protic acids include hydrochloric acid, sulfuric acid, camphor sulfonic acid, or toluene sulfonic acid. The conductive polymer is used for electron transport and can improve the conductivity of modified carbon-phosphorus composites.

[0091] The emulsifiers are sodium carboxymethyl cellulose and sodium dodecylbenzene sulfonate. The emulsifiers are used to reduce the surface tension of the system, so that the components are uniformly dispersed in water and avoid agglomeration, thereby making the modified carbon-phosphorus composite material have uniform properties. In addition, the emulsifiers are also used to improve interfacial compatibility and enhance the bonding force between the components, thereby improving the overall performance of the modified carbon-phosphorus composite material.

[0092] The low surface energy modifiers are polymethylsiloxane and polytetrafluoroethylene. They are used to prevent oxygen in the air from reacting with phosphorus. Phosphorus is chemically reactive and easily oxidized in the air to form phosphorus oxides, which in turn changes the chemical composition and structure of the material, thus affecting its performance. The low surface energy modifier can form a coating layer, which acts as a barrier to prevent direct contact between air and phosphorus, thus preventing phosphorus from being oxidized and maintaining the stability of the material.

[0093] The adhesive molding agent is sodium polyacrylate and lithium polyacrylate. The adhesive molding agent is sticky and can adhere to the surface of micron-sized particles, bonding individual or small clusters of micron-sized particles together. Through intermolecular forces, including van der Waals forces or hydrogen bonds, the micron-sized particles are connected to form centimeter-sized particles.

[0094] Preparation method of sample 6 Step 1: Primary mixing: First, take parts by weight of carbon-phosphorus composite material and disperse it in water, then add parts by weight of conductive polymer and parts by weight of emulsifier to obtain a primary mixing solution. The ratio of carbon-phosphorus composite material to water is 1:4. After adding parts by weight of conductive polymer and parts by weight of emulsifier, stir for 15 minutes.

[0095] Step 2: Secondary mixing: Add parts by weight of low surface energy modifier to the primary mixing solution in Step 1 and stir for 15 minutes to obtain a secondary mixing solution.

[0096] Step 3: Three-stage mixing: First, add the amount of binder and molding agent by weight to the two-stage mixing solution in Step 2 and stir for 15 minutes to obtain a three-stage mixing solution. Then, perform pressure filtration on the three-stage mixing solution to obtain a filter cake.

[0097] Step 4: Pressurization and drying: First, the filter cake is injected into the mold and pressurized to obtain a pressed blank. Then, the pressed blank is dried to obtain the modified carbon-phosphorus composite material. The pressurization pressure is 0.5 MPa, the drying atmosphere is nitrogen, the drying temperature is 115℃, the relative vacuum degree is <-0.08 MPa, and the time is 15h.

[0098] Lithium batteries, including sample 6 mentioned above.

[0099] Example 7 Modified carbon-phosphorus composite sample 7 The raw materials include the following components: 100 parts by weight of carbon-phosphorus composite material; 0.6 parts by weight of conductive polymer; 0.45 parts by weight of emulsifier; 0.65 parts by weight of low surface energy modifier; and 1.35 parts by weight of adhesive molding agent. Based on the initial weight of the material, after being left in air for 30 days, the weight gain of the material is 3.988%. The particle appearance of the material is similar to... Figure 1 resemblance.

[0100] The preparation method of carbon-phosphorus composite material is as follows: porous carbon and red phosphorus are placed alternately in a quartz tube, then the quartz tube is evacuated, and then the vacuum quartz tube is placed in a tube furnace for heating. After the red phosphorus sublimates, it is deposited into the porous carbon. After cooling, the carbon-phosphorus composite material is obtained. The mass ratio of porous carbon to red phosphorus is 1:1.5, the heating temperature is 490℃, and the heating time is 15h. The carbon-phosphorus composite material serves as the basic framework, providing the basic properties of the modified carbon-phosphorus composite material. Among them, carbon gives the modified carbon-phosphorus composite material chemical stability and mechanical strength, while phosphorus participates in the electrochemical reaction.

[0101] The conductive polymer is polyaniline, which becomes conductive through protic acid doping. Protic acids include hydrochloric acid, sulfuric acid, camphor sulfonic acid, or toluene sulfonic acid. The conductive polymer is used for electron transport and can improve the conductivity of modified carbon-phosphorus composites.

[0102] The emulsifiers are polyvinyl alcohol and sodium carboxymethyl cellulose. The emulsifiers are used to reduce the surface tension of the system, so that the components are uniformly dispersed in water and avoid agglomeration, thereby making the modified carbon-phosphorus composite material have uniform properties. In addition, the emulsifiers are also used to improve interfacial compatibility and enhance the bonding force between the components, thereby improving the overall performance of the modified carbon-phosphorus composite material.

[0103] The low surface energy modifiers are polydimethylsiloxane and polytetrafluoroethylene. They are used to prevent oxygen in the air from reacting with phosphorus. Phosphorus is chemically reactive and easily oxidized in the air to form phosphorus oxides, which in turn changes the chemical composition and structure of the material, thus affecting its performance. The low surface energy modifiers can form a coating layer, which acts as a barrier to prevent direct contact between air and phosphorus, thus preventing phosphorus from being oxidized and maintaining the stability of the material.

[0104] The adhesive molding agent is polyacrylic acid, sodium polyacrylate and lithium polyacrylate. The adhesive molding agent is sticky and can adhere to the surface of micron-sized particles, bonding individual or small clusters of micron-sized particles together. Through intermolecular forces, including van der Waals forces or hydrogen bonds, the micron-sized particles are connected to form centimeter-sized particles.

[0105] Preparation method of sample 7 Step 1: Primary mixing: First, take parts by weight of carbon-phosphorus composite material and disperse it in water, then add parts by weight of conductive polymer and parts by weight of emulsifier to obtain a primary mixing solution. The ratio of carbon-phosphorus composite material to water is 1:4.5. After adding parts by weight of conductive polymer and parts by weight of emulsifier, stir for 16 minutes.

[0106] Step 2: Secondary mixing: Add parts by weight of low surface energy modifier to the primary mixing solution in Step 1 and stir for 16 minutes to obtain a secondary mixing solution.

[0107] Step 3: Three-stage mixing: First, add the amount of binder and molding agent by weight to the two-stage mixing solution in Step 2 and stir for 16 minutes to obtain a three-stage mixing solution. Then, centrifuge the three-stage mixing solution to obtain a filter cake.

[0108] Step 4: Pressurization and drying: First, the filter cake is injected into the mold and the mold is pressurized to obtain a pressed blank. Then, the pressed blank is dried to obtain the modified carbon-phosphorus composite material. The pressurization pressure is 0.6 MPa, the drying atmosphere is argon, the drying temperature is 120℃, the relative vacuum degree is <-0.08 MPa, and the time is 12h.

[0109] Lithium batteries, including sample 7 mentioned above.

[0110] Example 8 8 modified carbon-phosphorus composite material samples The raw materials include the following components: 100 parts by weight of carbon-phosphorus composite material; 0.52 parts by weight of conductive polymer; 0.65 parts by weight of emulsifier; 0.55 parts by weight of low surface energy modifier; and 6 parts by weight of adhesive molding agent. Based on the initial weight of the material, after being left in air for 30 days, the weight gain of the material is 3.991%. The particle appearance of the material is similar to... Figure 1 resemblance.

[0111] The preparation method of carbon-phosphorus composite material is as follows: porous carbon and red phosphorus are placed alternately in a quartz tube, then the quartz tube is evacuated, and then the vacuum quartz tube is placed in a tube furnace for heating. After the red phosphorus sublimates, it is deposited into the porous carbon. After cooling, the carbon-phosphorus composite material is obtained. The mass ratio of porous carbon to red phosphorus is 1:1.8, the heating temperature is 475℃, and the heating time is 16h. The carbon-phosphorus composite material serves as the basic framework, providing the basic properties of the modified carbon-phosphorus composite material. Carbon gives the modified carbon-phosphorus composite material chemical stability and mechanical strength, while phosphorus participates in the electrochemical reaction.

[0112] The conductive polymer is polyaniline, which becomes conductive through protic acid doping. Protic acids include hydrochloric acid, sulfuric acid, camphor sulfonic acid, or toluene sulfonic acid. The conductive polymer is used for electron transport and can improve the conductivity of modified carbon-phosphorus composites.

[0113] The emulsifiers are polyvinyl alcohol, polyethylene glycol, and sodium carboxymethyl cellulose. The emulsifiers are used to reduce the surface tension of the system, so that the components are uniformly dispersed in water and avoid agglomeration, thereby making the modified carbon-phosphorus composite material have uniform properties. In addition, the emulsifiers are also used to improve interfacial compatibility and enhance the bonding force between the components, thereby improving the overall performance of the modified carbon-phosphorus composite material.

[0114] Low surface energy modifiers include polydimethylsiloxane, polyvinylsiloxane, and polymethylsiloxane. These modifiers are used to prevent oxygen in the air from reacting with phosphorus. Phosphorus is chemically reactive and easily oxidized in the air to form phosphorus oxides, which in turn alters the chemical composition and structure of the material, affecting its performance. Low surface energy modifiers can form a coating layer, acting as a barrier to prevent direct contact between air and phosphorus, thus preventing phosphorus oxidation and maintaining the stability of the material.

[0115] The adhesive molding agent is polyacrylic acid, sodium polyacrylate and lithium polyacrylate. The adhesive molding agent is sticky and can adhere to the surface of micron-sized particles, bonding individual or small clusters of micron-sized particles together. Through intermolecular forces, including van der Waals forces or hydrogen bonds, the micron-sized particles are connected to form centimeter-sized particles.

[0116] Preparation method of sample 8 Step 1: Primary mixing: First, take a weight portion of carbon-phosphorus composite material and disperse it in water, then add a weight portion of conductive polymer and a weight portion of emulsifier to obtain a primary mixing solution. The ratio of carbon-phosphorus composite material to water is 1:3.5. After adding the weight portion of conductive polymer and the weight portion of emulsifier, stir for 18 minutes.

[0117] Step 2: Secondary mixing: Add parts by weight of low surface energy modifier to the primary mixing solution in Step 1 and stir for 18 minutes to obtain a secondary mixing solution.

[0118] Step 3: Three-stage mixing: First, add the amount of binder and molding agent by weight to the two-stage mixing solution in Step 2 and stir for 18 minutes to obtain a three-stage mixing solution. Then, centrifuge the three-stage mixing solution to obtain a filter cake.

[0119] Step 4: Pressurization and drying: First, the filter cake is injected into the mold and pressurized to obtain a pressed blank. Then, the pressed blank is dried to obtain the modified carbon-phosphorus composite material. The pressurization pressure is 0.8 MPa, the drying atmosphere is nitrogen, the drying temperature is 540℃, the relative vacuum degree is <-0.08 MPa, and the time is 11h.

[0120] Lithium batteries, including sample 8 mentioned above.

[0121] Example 9 Modified carbon-phosphorus composite material sample 9 The raw materials include the following components: 100 parts by weight of carbon-phosphorus composite material; 0.72 parts by weight of conductive polymer; 0.45 parts by weight of emulsifier; 0.38 parts by weight of low surface energy modifier; and 3.25 parts by weight of adhesive molding agent. Based on the initial weight of the material, after being left in air for 30 days, the weight gain of the material is 3.990%. The particle appearance of the material is similar to... Figure 1 resemblance.

[0122] The preparation method of carbon-phosphorus composite material is as follows: porous carbon and red phosphorus are placed alternately in a quartz tube, then the quartz tube is evacuated, and then the vacuum quartz tube is placed in a tube furnace for heating. After the red phosphorus sublimates, it is deposited into the porous carbon. After cooling, the carbon-phosphorus composite material is obtained. The mass ratio of porous carbon to red phosphorus is 1:2, the heating temperature is 485℃, and the heating time is 24h. The carbon-phosphorus composite material serves as the basic framework, providing the fundamental properties for the modified carbon-phosphorus composite material. Carbon contributes to the chemical stability and mechanical strength of the modified carbon-phosphorus composite material, while phosphorus participates in the electrochemical reaction.

[0123] The conductive polymers are poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate and polyaniline. The conjugated structure of poly(3,4-ethylenedioxythiophene) endows it with intrinsic conductivity, but it needs to be compounded with polystyrene sulfonate and doped with the polystyrene sulfonate to form water-soluble poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate, thus enabling processability. Polyaniline becomes conductive through protic acid doping, including hydrochloric acid, sulfuric acid, camphor sulfonic acid, or toluene sulfonic acid. These conductive polymers are used for electron transport and can improve the conductivity of modified carbon-phosphorus composites.

[0124] The emulsifier is polyvinyl alcohol. The emulsifier is used to reduce the surface tension of the system, so that the components are uniformly dispersed in water and avoid agglomeration, thereby making the modified carbon-phosphorus composite material have uniform properties. In addition, the emulsifier is also used to improve interfacial compatibility and enhance the bonding force between the components, thereby improving the overall performance of the modified carbon-phosphorus composite material.

[0125] Low surface energy modifiers are polydimethylsiloxane and polyvinylsiloxane. Low surface energy modifiers are used to prevent oxygen in the air from reacting with phosphorus. Phosphorus is chemically reactive and is easily oxidized in the air to form phosphorus oxides, which in turn changes the chemical composition and structure of the material, thus affecting its performance. Low surface energy modifiers can form a coating layer, which acts as a barrier to prevent air from directly contacting phosphorus, preventing phosphorus from being oxidized, and thus maintaining the stability of the material.

[0126] The adhesive molding agent is polyacrylic acid, sodium polyacrylate and lithium polyacrylate. The adhesive molding agent is sticky and can adhere to the surface of micron-sized particles, bonding individual or small clusters of micron-sized particles together. Through intermolecular forces, including van der Waals forces or hydrogen bonds, the micron-sized particles are connected to form centimeter-sized particles.

[0127] Preparation method of sample 9 Step 1: Primary mixing: First, take a weight portion of carbon-phosphorus composite material and disperse it in water, then add a weight portion of conductive polymer and a weight portion of emulsifier to obtain a primary mixing solution. The ratio of carbon-phosphorus composite material to water is 1:4.5. After adding the weight portion of conductive polymer and the weight portion of emulsifier, stir for 25 minutes.

[0128] Step 2: Secondary mixing: Add parts by weight of low surface energy modifier to the primary mixing solution in Step 1 and stir for 20 minutes to obtain a secondary mixing solution.

[0129] Step 3: Three-stage mixing: First, add the amount of binder and molding agent by weight to the two-stage mixing solution in Step 2 and stir for 20 minutes to obtain a three-stage mixing solution. Then, perform pressure filtration on the three-stage mixing solution to obtain a filter cake.

[0130] Step 4: Pressurization and drying: First, the filter cake is injected into the mold and pressurized to obtain a pressed blank. Then, the pressed blank is dried to obtain the modified carbon-phosphorus composite material. The pressurization pressure is 0.55 MPa, the drying atmosphere is nitrogen, the drying temperature is 110℃, the relative vacuum degree is <-0.08 MPa, and the time is 16h.

[0131] Sodium batteries, including the aforementioned sample 9.

[0132] Comparative Example 1 Carbon-phosphorus composite materials The raw material comprises the following components: 1 part by weight of porous carbon; 3 parts by weight of red phosphorus. Based on the initial weight of the material, after being left in air for 30 days, the weight gain of the material is 86.450%. The particle appearance of the material is as follows: Figure 2 As shown.

[0133] Preparation method of carbon-phosphorus composite materials Porous carbon and red phosphorus are placed alternately in a quartz tube. The quartz tube is then evacuated and placed in a tube furnace for heating. The red phosphorus sublimates and deposits into the porous carbon. After cooling, the product is obtained. The heating temperature is 550℃ and the time is 24h.

[0134] Lithium batteries, including the aforementioned carbon-phosphorus composite material.

[0135] The mass changes of the materials in Examples 1-9 and Comparative Example 1 after being exposed to air for 30 days are shown in Table 1 and... Figure 3 As shown.

[0136] Table 1. Mass changes of materials in Examples 1-9 and Comparative Example 1 after being exposed to air for 30 days.

[0137] In summary, Examples 1-9 are modified carbon-phosphorus composite materials, and Comparative Example 1 is a carbon-phosphorus composite material in the prior art. That is, the modified carbon-phosphorus composite material prepared by this invention through the addition of a binder and a low surface energy modifier, as well as the synergistic effect of each component, produces centimeter-sized particles. Compared with the micron-sized particles in the prior art, it has advantages such as lower health hazards, less adhesion, higher oxidation resistance, and higher safety. The oxidation resistance is shown in Table 1 and... Figure 3 As shown, when the materials in Examples 1-9 were left in the air for 30 days, the weight of the materials increased by only (3.987-3.993)%, while that in Comparative Example 1 increased by 86.450%. This means that the modified carbon-phosphorus composite material in this invention has excellent antioxidant properties and produced unexpected technical effects.

[0138] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any modifications or equivalent changes made based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. A modified carbon-phosphorus composite material, characterized in that, The raw materials include the following components: 100 parts by weight of carbon-phosphorus composite material; Conductive polymer 0.05-3 parts by weight; Emulsifier 0.05-5 parts by weight; 0.2-2 parts by weight of low surface energy modifier; Adhesive molding agent 0.25-8 parts by weight, Based on the initial weight of the material, when the material is left in the air for 30 days, the weight gain of the material is (3.987-3.993)%.

2. The material according to claim 1, characterized in that, The preparation method of the carbon-phosphorus composite material is as follows: porous carbon and red phosphorus are placed alternately in a quartz tube, then the quartz tube is evacuated, and then the vacuum quartz tube is placed in a tube furnace for heating. After the red phosphorus sublimates, it is deposited into the porous carbon. After cooling, the composite material is obtained.

3. The material according to claim 1, characterized in that, The conductive polymer is poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate, and / or polyaniline.

4. The material according to claim 1, characterized in that, The emulsifier is one or more of polyvinyl alcohol, polyethylene glycol, sodium hydroxymethyl cellulose, and sodium dodecylbenzene sulfonate.

5. The material according to claim 1, characterized in that, The low surface energy modifier is one or more of polydimethylsiloxane, polyvinylsiloxane, polymethylsiloxane, phenyl polytrimethylsiloxane, and polytetrafluoroethylene.

6. The material according to claim 1, characterized in that, The adhesive molding agent is one or more of polyacrylic acid, sodium polyacrylate, and lithium polyacrylate.

7. A method for preparing the material according to any one of claims 1-6, characterized in that, The method includes the following steps: Step 1: Primary mixing: First, take parts by weight of the carbon-phosphorus composite material and disperse it in water, then add parts by weight of the conductive polymer and parts by weight of the emulsifier to obtain a primary mixing solution; Step 2: Secondary mixing: Add parts by weight of the low surface energy modifier to the primary mixing solution in Step 1 to obtain a secondary mixing solution; Step 3: Three-stage mixing: First, add the adhesive molding agent in parts by weight to the secondary mixing solution in step 2 to obtain a three-stage mixing solution. Then, perform solid-liquid separation treatment on the three-stage mixing solution to obtain a filter cake. Step 4: Pressurization and drying: First, the filter cake is injected into the mold and the mold is pressurized to obtain a pressed blank. Then, the pressed blank is dried to obtain the modified carbon-phosphorus composite material.

8. The method according to claim 7, characterized in that, In step 1, the mass ratio of the carbon-phosphorus composite material to the water is 1:(2-5).

9. A battery, characterized in that, The battery comprises the material according to any one of claims 1-6.

10. The battery according to claim 9, characterized in that, The battery includes a lithium battery or a sodium battery.

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