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CN-122000356-A - Electron/ion double-conductor slurry additive and preparation method and application thereof

CN122000356ACN 122000356 ACN122000356 ACN 122000356ACN-122000356-A

Abstract

The invention provides an electron/ion double-conductor slurry additive, a preparation method and application thereof, and belongs to the technical field of lithium batteries. According to the invention, the polymer with high ion conductivity is grafted on the carbon material with high electron conductivity, so that the mixed conductivity of electrons and ions is realized, and the multiplying power performance of the battery core is improved. Experimental results show that the first-cycle charge specific capacity of the battery assembled by the electronic/ionic double-conductor slurry additive is 318.4-334.6 milliampere hours/gram, and the first-cycle discharge specific capacity is 288.1-301.8 milliampere hours/gram.

Inventors

  • WANG GUOQING
  • BAI ZHENHUI

Assignees

  • 山东创能新材料有限公司
  • 北京创能惠通科技有限公司

Dates

Publication Date
20260508
Application Date
20260305

Claims (10)

  1. 1. An electron/ion double conductor paste additive comprising a carbon material and a polymer grafted onto the carbon material; the carbon material is at least one of carbon nano tube, graphene oxide and reduced graphene oxide; Monomers for preparing the polymer are glycerol diglycidyl ether, benzyl glycidyl ether, furan glycidyl ether, diglycidyl ether, 1, 3-bis (oxiran-2-ylmethoxy) benzene, 2-bis (trifluoromethyl) oxirane, 1, 4-bis (oxiran-2-ylmethoxy) butane, bis (4- (oxiran-2-ylmethoxy) phenyl) methane 1, 4-bis ((ethylene oxide-2-ylmethoxy) methyl) cyclohexane, 2'- (((((9H-fluorene-9, 9-diyl) bis (4, 1-phenylene)) bis (oxy)) bis (methylene)) bis (ethylene oxide) at least one of 2,2' - (2, 3,4, 5-octafluorohexane-1, 6-diyl) bis (ethylene oxide), resorcinol diglycidyl ether, and 1, 4-butanediol diglycidyl ether.
  2. 2. The method for preparing the electron/ion double-conductor paste additive according to claim 1, comprising the steps of: (1) Mixing a carbon material with an organic solvent to obtain a carbon material dispersion; (2) And (3) mixing the carbon material dispersion liquid obtained in the step (1) with a monomer and an initiator, and carrying out in-situ polymerization to obtain the electron/ion double-conductor slurry additive.
  3. 3. The method according to claim 2, wherein the organic solvent in the step (1) is at least one of dimethyl sulfoxide, N-methylpyrrolidone, N-dimethylformamide, sulfolane and absolute ethanol.
  4. 4. The method according to claim 2, wherein the initiator in the step (2) is at least one of aluminum triflate, scandium triflate, triethylborane, phosphazene base, lithium difluorooxalato borate, lithium hexafluorophosphate and lithium tetrafluoroborate.
  5. 5. The preparation method according to claim 2, wherein the mass of the initiator in the step (2) is 0.01-50% of the mass of the monomer.
  6. 6. The preparation method of claim 2, wherein the mass ratio of the carbon material in the step (1) to the monomer in the step (2) is 1:10 to 10:1.
  7. 7. The preparation method according to claim 2, wherein the in-situ polymerization temperature in the step (2) is 40-150 ℃, the in-situ polymerization time is 0.5-72 h, and the rate of heating to the in-situ polymerization temperature is 0.5-10 ℃ per minute.
  8. 8. The application of the electron/ion double-conductor slurry additive in the positive electrode plate, wherein the electron/ion double-conductor slurry additive is prepared by the electron/ion double-conductor slurry additive in the claim 1 or the preparation method in any one of claims 2-7.
  9. 9. The method for preparing the positive electrode plate according to claim 8, wherein the method comprises the steps of mixing an electron/ion double-conductor slurry additive, a solvent, a positive electrode material and an adhesive, and then drying to obtain the positive electrode plate.
  10. 10. The use according to claim 9, wherein the mass content of the positive electrode material in the positive electrode sheet is 20-98%, the mass content of the electron/ion double-conductor slurry additive in the positive electrode sheet is 0.1-25%, and the mass content of the adhesive in the positive electrode sheet is 0.1-30%.

Description

Electron/ion double-conductor slurry additive and preparation method and application thereof Technical Field The invention belongs to the technical field of lithium batteries, and particularly relates to an electronic/ionic double-conductor slurry additive, a preparation method and application thereof. Background With the rapid development of consumer electronics markets and new energy automobiles, the demand for high specific energy lithium ion batteries is increasing. Layered oxide type cathode materials have been widely used due to their high specific discharge capacity and energy density. However, the layered oxide has poor electron conductivity, so that it is difficult to meet the requirement of high-power charge and discharge by relying on the electron conductivity of the layered oxide alone, and the rate performance still has room for improvement. As the energy density of the battery cell is gradually increased, the surface capacity of the positive electrode plate is further increased. However, as the thickness of the electrode increases, the electrolyte is difficult to fully infiltrate the electrode close to the current collector side, so that lithium ion conduction is difficult, and the rate capability of the battery cell is severely restricted. Therefore, how to improve the rate capability of the battery cell is a technical problem to be solved in the art. Disclosure of Invention The invention aims to provide an electron/ion double-conductor slurry additive, a preparation method and application thereof. The electron/ion double-conductor slurry additive provided by the invention can improve the multiplying power performance of the battery core. In order to achieve the above object, the present invention provides the following technical solutions: the invention provides an electron/ion double-conductor slurry additive, which comprises a carbon material and a polymer grafted on the carbon material; the carbon material is at least one of carbon nano tube, graphene oxide and reduced graphene oxide; Monomers for preparing the polymer are glycerol diglycidyl ether, benzyl glycidyl ether, furan glycidyl ether, diglycidyl ether, 1, 3-bis (oxiran-2-ylmethoxy) benzene, 2-bis (trifluoromethyl) oxirane, 1, 4-bis (oxiran-2-ylmethoxy) butane, bis (4- (oxiran-2-ylmethoxy) phenyl) methane 1, 4-bis ((ethylene oxide-2-ylmethoxy) methyl) cyclohexane, 2'- (((((9H-fluorene-9, 9-diyl) bis (4, 1-phenylene)) bis (oxy)) bis (methylene)) bis (ethylene oxide) at least one of 2,2' - (2, 3,4, 5-octafluorohexane-1, 6-diyl) bis (ethylene oxide), resorcinol diglycidyl ether, and 1, 4-butanediol diglycidyl ether. The invention also provides a preparation method of the electron/ion double-conductor slurry additive, which comprises the following steps: (1) Mixing a carbon material with an organic solvent to obtain a carbon material dispersion; (2) And (3) mixing the carbon material dispersion liquid obtained in the step (1) with a monomer and an initiator, and carrying out in-situ polymerization to obtain the electron/ion double-conductor slurry additive. Preferably, the organic solvent in the step (1) is at least one of dimethyl sulfoxide, N-methyl pyrrolidone, N-dimethylformamide, sulfolane and absolute ethanol. Preferably, the initiator in the step (2) is at least one of aluminum triflate, scandium triflate, triethylborane, phosphazene base, lithium difluorooxalato borate, lithium hexafluorophosphate and lithium tetrafluoroborate. Preferably, the mass of the initiator in the step (2) is 0.01-50% of the mass of the monomer. Preferably, the mass ratio of the carbon material in the step (1) to the monomer in the step (2) is 1:10-10:1. Preferably, the in-situ polymerization temperature in the step (2) is 40-150 ℃, the in-situ polymerization time is 0.5-72 h, and the rate of heating to the in-situ polymerization temperature is 0.5-10 ℃ per minute. The invention also provides an application of the electron/ion double-conductor slurry additive in the positive plate, or the electron/ion double-conductor slurry additive prepared by the preparation method in the technical scheme. Preferably, the preparation method of the positive electrode plate comprises the steps of mixing an electron/ion double-conductor slurry additive, a solvent, a positive electrode material and an adhesive, and then drying to obtain the positive electrode plate. Preferably, the mass content of the positive electrode material in the positive electrode plate is 20-98%, the mass content of the electron/ion double-conductor slurry additive in the positive electrode plate is 0.1-25%, and the mass content of the adhesive in the positive electrode plate is 0.1-30%. The invention provides an electron/ion double-conductor slurry additive, which comprises a carbon material and a polymer grafted on the carbon material; the carbon material is at least one of carbon nano tube, graphene oxide and reduced graphene oxide; the monomer from which the polymer is prepared is at least o