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CN-122025634-A - Superconductive graphene conductive agent, preparation method thereof and alkaline zinc-manganese battery

CN122025634ACN 122025634 ACN122025634 ACN 122025634ACN-122025634-A

Abstract

The invention provides a superconductive graphene conductive agent, a preparation method thereof and an alkaline zinc-manganese battery, wherein the superconductive graphene conductive agent comprises carbon black, carbon nano tubes, graphene and a solvent, wherein the carbon black is dispersed by a small molecular dispersing agent, the carbon nano tubes are covalently functionalized, the graphene is dispersed by a large molecular dispersing agent, and the specific surface areas of the carbon black, the carbon nano tubes and the graphene are sequentially increased to form gradients, so that a multidimensional and three-dimensional synergistic efficient conductive network is constructed. The conductive agent utilizes carbon materials with different structures, different specific surface areas and different dosage proportions to construct a multidimensional, three-dimensional and stable efficient conductive network in a gradient manner, and meanwhile, dispersing agents or functionalization with corresponding sizes are selected according to the characteristics of the carbon materials, so that the problem that the carbon materials are difficult to uniformly disperse in composite use is effectively solved. The alkaline zinc-manganese dioxide battery using the conductive agent has excellent multiplying power performance and high-low temperature service life.

Inventors

  • LU QIHUA

Assignees

  • 南平市延平鑫东来科技有限公司

Dates

Publication Date
20260512
Application Date
20260126

Claims (13)

  1. 1. A superconductive graphene conductive agent is characterized by comprising carbon black, carbon nanotubes, graphene and a solvent; The carbon black is carbon black dispersed by a small molecular dispersant; The carbon nanotubes are covalent functionalized carbon nanotubes; The graphene is graphene dispersed by a macromolecular dispersing agent; And the specific surface areas of the carbon black, the carbon nano tube and the graphene are sequentially increased to form a gradient, so that a multidimensional and three-dimensional synergistic efficient conductive network is constructed.
  2. 2. The superconducting graphene conductive agent according to claim 1, wherein: the specific surface area of the carbon black is 50-300m 2 /g; The specific surface area of the carbon nano tube is 400-800m 2 /g; The specific surface area of the graphene is 1000-1500m 2 /g; the composite structure is specifically: the carbon black is filled in the tiny gaps of the conductive agent based on the zero-dimensional point structure of the carbon black, and primary point contact is established; the carbon nano tube is based on a one-dimensional linear structure and is used as a long-distance wire to be connected with a conductive agent to form a long Cheng Daodian bridge, and a long-distance bridging and penetrating toughness framework is established; The graphene provides a broadband conductive plane based on a two-dimensional surface structure of the graphene, an intrinsic conductive path is established, and active substances are coated and connected.
  3. 3. The superconducting graphene conductive agent according to claim 1, wherein: the carbon nanotube is selected from one of carboxylated carbon nanotube, hydroxylated carbon nanotube and aminated carbon nanotube.
  4. 4. The superconducting graphene conductive agent according to claim 1, wherein: The small-molecule dispersing agent is selected from one of octyl phenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, sorbitan ester, polysorbate, glycerol stearate, coco diethanolamide, stearic acid, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate; The macromolecular dispersing agent is selected from one of sodium carboxymethyl cellulose, polyvinylpyrrolidone, polyethylene oxide, polypropylene oxide, polyimide, sodium lignin sulfonate, sodium polyacrylate and styrene-maleic anhydride copolymer.
  5. 5. A superconducting graphene conductive agent according to claim 1, wherein the solvent is selected from one of cyclohexanone, acetone, butanone, N-methylpyrrolidone, acetylacetone, methyl isobutyl ketone, isophorone, and dipropone.
  6. 6. A preparation method of a superconductive graphene conductive agent is characterized by comprising the following steps: S1, dissolving and dispersing a small molecular dispersing agent in a solvent by utilizing a sand mill, and adding carbon black into the sand mill in batches for grinding and dispersing to obtain a dispersing liquid A; S2, dissolving and dispersing the macromolecular dispersing agent in a solvent by utilizing a sand mill, and adding graphene into the sand mill in batches for grinding and dispersing to obtain a dispersing liquid B; s3, sequentially adding the dispersion liquid A, the dispersion liquid B and the covalent functionalized carbon nanotubes into a high-speed shearing machine according to a proportion to uniformly disperse, and adjusting the required solid content by using a solvent to obtain the superconductive graphene conductive agent; The specific surface areas of the carbon black, the carbon nano tube and the graphene are sequentially increased to form a gradient, so that the prepared superconductive graphene conductive agent can construct a multidimensional and three-dimensional synergistic efficient conductive network.
  7. 7. The method of claim 6, wherein: The consumption of the small molecular dispersing agent is 10-30% of the mass consumption of the carbon black; The dosage of the macromolecular dispersing agent is 1-5% of the mass dosage of the graphite.
  8. 8. The method of claim 6, wherein: the mass consumption ratio of the carbon black to the covalent functionalized carbon nano tube to the graphene is (60-80)/(10-20).
  9. 9. The method of claim 6, wherein the superconducting graphene conductive agent has a solids content of 40% -70%.
  10. 10. The method of claim 6, wherein: the specific surface area of the carbon black is 50-300m 2 /g; The specific surface area of the carbon nano tube is 400-800m 2 /g; The specific surface area of the graphene is 1000-1500m 2 /g; the composite structure is specifically: the carbon black is filled in the tiny gaps of the conductive agent based on the zero-dimensional point structure of the carbon black, and primary point contact is established; the carbon nano tube is based on a one-dimensional linear structure and is used as a long-distance wire to be connected with a conductive agent to form a long Cheng Daodian bridge, and a long-distance bridging and penetrating toughness framework is established; The graphene provides a broadband conductive plane based on a two-dimensional surface structure of the graphene, an intrinsic conductive path is established, and active substances are coated and connected.
  11. 11. The method of claim 6, wherein the carbon nanotubes are selected from one of carboxylated carbon nanotubes, hydroxylated carbon nanotubes, and aminated carbon nanotubes.
  12. 12. The method of claim 6, wherein: The small-molecule dispersing agent is selected from one of octyl phenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, sorbitan ester, polysorbate, glycerol stearate, coco diethanolamide, stearic acid, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate; The macromolecular dispersing agent is selected from one of sodium carboxymethyl cellulose, polyvinylpyrrolidone, polyethylene oxide, polypropylene oxide, polyimide, sodium lignin sulfonate, sodium polyacrylate and styrene-maleic anhydride copolymer; The solvent is one selected from cyclohexanone, acetone, butanone, N-methyl pyrrolidone, acetylacetone, methyl isobutyl ketone, isophorone and dipropyl ketone.
  13. 13. An alkaline zinc-manganese cell characterized in that the alkaline manganese cell comprises the superconducting graphene conductive agent according to any one of claims 1 to 5 or comprises the superconducting graphene conductive agent prepared by the method according to any one of claims 6 to 12.

Description

Superconductive graphene conductive agent, preparation method thereof and alkaline zinc-manganese battery Technical Field The invention relates to the technical field of batteries, in particular to a superconductive graphene conductive agent, a preparation method thereof and an alkaline zinc-manganese battery. Background The alkaline manganese cell has the characteristics of high discharge power, long shelf life, convenient and quick use, high cost performance and the like, and is dominant in a plurality of primary cells. With the increasing range of applications of alkaline manganese cells, people put higher and higher demands on the use of alkaline manganese cells in high power states and long life in different temperature environments. Therefore, materials, formulations, structural members and the like selected for the alkaline manganese cell need to be optimized to try to make the electrode material exert electrical properties to a greater extent, and particularly, it is required to reduce the internal resistance of the cell, reduce the electrode passivation behavior of the cell in the discharging process, and improve the stability of the electrode structure to ensure that the alkaline manganese cell has a longer service life. For the alkaline manganese cell, the conductive agent is used in the electrode manufacturing process to increase the electronic conductivity between active substances and between the active substances and the current collector, so that a conductive network is formed on the surface of the active substances to accelerate the electronic transmission rate, and the alkaline manganese cell has excellent discharge characteristics. The current conductive agents are basically prepared based on carbon-based materials (such as conductive carbon black, carbon nano tubes, graphene and the like), are mostly used in a single structure, have path defects on electron transmission, are unfavorable for large-current discharge of batteries and are used in a severe temperature environment, and even if the defects of the single structure are overcome by adopting carbon-based materials for compounding, the situation of poor dispersion of the conductive agents is difficult to avoid, so that the conductive agents have better conductive effects. Disclosure of Invention The invention aims to solve the technical problems of providing a superconductive graphene conductive agent, a preparation method thereof and an alkaline zinc-manganese battery, wherein a multidimensional, three-dimensional and stable efficient conductive network is constructed by utilizing carbon materials with different structures, different specific surface areas and different dosage proportions in a gradient manner, and meanwhile, the problem that the carbon materials are difficult to uniformly disperse in the compounding use is effectively solved by selecting dispersing agents or functionalization of corresponding sizes according to the carbon materials with different structures and different specific surface areas. In a first aspect, the invention provides a superconductive graphene conductive agent applied to an alkaline zinc-manganese battery, which comprises carbon black, carbon nanotubes, graphene and a solvent; The carbon black is carbon black dispersed by a small molecular dispersant; The carbon nanotubes are covalent functionalized carbon nanotubes; The graphene is graphene dispersed by a macromolecular dispersing agent; And the specific surface areas of the carbon black, the carbon nano tube and the graphene are sequentially increased to form a gradient, so that a multidimensional and three-dimensional synergistic efficient conductive network is constructed. Further, the specific surface area of the carbon black is 50-300m 2/g, the specific surface area of the carbon nano tube is 400-800m 2/g, and the specific surface area of the graphene is 1000-1500m 2/g; The composite structure specifically comprises carbon black filled in a small gap of a conductive agent based on a zero-dimensional point structure of the carbon black to establish primary point contact, carbon nanotubes connected with the conductive agent as long-distance lines based on a one-dimensional linear structure of the carbon nanotubes to form a long Cheng Daodian bridge to establish a long-distance bridging and penetrating toughness skeleton, and graphene provided with a broadband conductive plane based on a two-dimensional surface structure of the graphene to establish an intrinsic conductive path to coat and connect active substances. Further, the carbon nanotube is one selected from carboxylated carbon nanotubes, hydroxylated carbon nanotubes and aminated carbon nanotubes. Further, the small-molecule dispersing agent is selected from one of octyl phenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, sorbitan ester, polysorbate, glycerol stearate, coco diethanolamide, stearic acid, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate; The macro