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CN-121983521-A - Positive and negative electrode slurry, preparation method thereof, positive and negative electrode plates and sodium ion battery

CN121983521ACN 121983521 ACN121983521 ACN 121983521ACN-121983521-A

Abstract

The invention discloses a positive and negative electrode slurry and a preparation method thereof, a positive and negative electrode plate and a sodium ion battery, wherein the positive electrode slurry comprises a polyanion active material, a carbon nanotube, a superconducting carbon black, polyvinylidene fluoride and an organic solvent, the polyanion active material, the carbon nanotube, the superconducting carbon black and the polyvinylidene fluoride are mixed and dispersed in the organic solvent, the mass percentage of the polyanion active material, the carbon nanotube, the superconducting carbon black and the polyvinylidene fluoride is 90.0-98.0 percent (0.4-3.0 percent) (0.4-4.0 percent) (1.2-3.0 percent), the negative electrode slurry comprises a hard carbon active material, the superconducting carbon black, the carboxymethyl cellulose, the styrene-butadiene rubber and the aqueous solvent, and the hard carbon active material, the superconducting carbon black, the carboxymethyl cellulose and the styrene-butadiene rubber are mixed and dispersed in the aqueous solvent, wherein the mass percentage of the hard carbon active material, the superconducting carbon black, the carboxymethyl cellulose and the styrene-butadiene rubber is 90.0-95.0 percent (0.5-4.0 percent) (0.2-3.0 percent).

Inventors

  • LEI YUN
  • ZHANG ZHIFENG
  • SHI HAIMIN
  • DENG CHENGJUN

Assignees

  • 深圳市卡儿酷科技股份有限公司

Dates

Publication Date
20260505
Application Date
20241025

Claims (20)

  1. 1. The positive electrode slurry for the battery is characterized by comprising a polyanion active material, carbon nanotubes, superconducting carbon black, polyvinylidene fluoride and an organic solvent, wherein the polyanion active material, the carbon nanotubes, the superconducting carbon black and the polyvinylidene fluoride are mixed and dispersed in the organic solvent, and the mass percentage of the polyanion active material, the carbon nanotubes, the superconducting carbon black and the polyvinylidene fluoride is (90.0% -98.0%):0.4% -3.0%) (0.4% -4.0%) (1.2% -3.0%).
  2. 2. The positive electrode slurry according to claim 1, wherein the mass percentage of the polyanionic active material, the carbon nanotube, the superconducting carbon black, and the polyvinylidene fluoride in the positive electrode slurry is (93.0% -95.0%) (1.0% -2.5%) (1.2% -2.5%).
  3. 3. The positive electrode slurry according to claim 1, wherein the positive electrode slurry is coated on the surface of a positive electrode current collector of the battery, and the coating density of the positive electrode slurry is 13.0mg/cm 2 ～30.4mg/cm 2 .
  4. 4. The positive electrode slurry according to claim 3, wherein the coating density of the positive electrode slurry is 13.5mg/cm 2 ～25.2mg/cm 2 .
  5. 5. The positive electrode slurry according to claim 1, wherein the organic solvent comprises at least N-methylpyrrolidone or acetone.
  6. 6. A positive electrode slurry preparation method for preparing the positive electrode slurry according to any one of claims 1 to 5, characterized by comprising: providing polyvinylidene fluoride, superconducting carbon black, carbon nanotubes and polyanion active material in a dry powder state; Mixing the polyvinylidene fluoride, the superconducting carbon black, the carbon nanotubes and the polyanion active material with an organic solvent to obtain the positive electrode slurry, wherein the organic solvent at least comprises N-methyl pyrrolidone or acetone.
  7. 7. The method for producing a positive electrode slurry according to claim 6, comprising: adding the polyvinylidene fluoride into the organic solvent, stirring and preparing polyvinylidene fluoride glue solution; adding the superconducting carbon black into the polyvinylidene fluoride glue solution, stirring and preparing a mixed glue solution A; Adding the carbon nano tube into the mixed glue solution A, stirring and preparing a mixed glue solution B; and adding the polyanion active material into the mixed glue solution B, stirring and preparing the anode slurry.
  8. 8. The method for producing a positive electrode slurry according to claim 6, comprising: Mixing and adding the polyvinylidene fluoride, the superconducting carbon black, the carbon nano tube and the polyanion active material into the organic solvent, and stirring to obtain a mixture D; And adding the organic solvent into the mixture D, stirring and preparing the positive electrode slurry.
  9. 9. The negative electrode slurry for the battery is characterized by comprising a hard carbon active substance, superconducting carbon black, carboxymethyl cellulose, styrene-butadiene rubber and an aqueous solvent, wherein the hard carbon active substance, the superconducting carbon black, the carboxymethyl cellulose and the styrene-butadiene rubber are mixed and dispersed in the aqueous solvent, and the mass percentage of the hard carbon active substance, the superconducting carbon black, the carboxymethyl cellulose and the styrene-butadiene rubber is 90.0% -95.0%) (0.5% -4.0%) (0.2% -3.0%) (1.2% -3.0%).
  10. 10. The anode slurry according to claim 9, wherein the mass percentage of the hard carbon active material, the superconducting carbon black, the carboxymethyl cellulose and the styrene-butadiene rubber in the anode slurry is (93.0% -94.5%) (1.0% -3.0%) (0.5% -2.0%) (1.5% -2.5%).
  11. 11. The anode slurry according to claim 9, wherein the anode slurry is coated on the surface of an anode current collector of the battery, and the coating density of the anode slurry is 5.2mg/cm 2 ～12.6mg/cm 2 .
  12. 12. The anode slurry of claim 11, wherein the anode slurry has a coating density of 5.4mg/cm 2 ～10.2mg/cm 2 .
  13. 13. The anode slurry according to claim 9, wherein the aqueous solvent has a conductivity of less than 8 μs/cm.
  14. 14. The anode slurry according to claim 9, wherein the aqueous solvent comprises at least deionized water.
  15. 15. A negative electrode slurry preparation method for preparing the negative electrode slurry according to any one of claims 9 to 14, characterized by comprising: providing carboxymethyl cellulose, superconducting carbon black, hard carbon active material and emulsion-like styrene butadiene rubber in a dry powder state; Mixing the carboxymethyl cellulose, the superconducting carbon black, the hard carbon active material, the styrene-butadiene rubber and the aqueous solvent to obtain the negative electrode slurry, wherein the conductivity of the aqueous solvent is less than 8 mu S/cm.
  16. 16. The method for producing a negative electrode slurry according to claim 15, characterized by comprising: Adding the carboxymethyl cellulose into an aqueous solvent, and stirring to prepare carboxymethyl cellulose gum solution; Adding the superconducting carbon black into the carboxymethyl cellulose gum solution, stirring and preparing mixed gum solution C; And adding the hard carbon active substance into the mixed glue solution C, stirring, and adding styrene-butadiene rubber after stirring to prepare the negative electrode slurry.
  17. 17. The method for producing a negative electrode slurry according to claim 15, characterized by comprising: Mixing and adding 40% -50% of the superconducting carbon black, the hard carbon active substance, the styrene-butadiene rubber and the provided carboxymethyl cellulose into the water-based solvent, and kneading for a certain period of time to form a dough-like mixture E; and adding an aqueous solvent and the rest of carboxymethyl cellulose into the mixture E, and stirring to prepare the negative electrode slurry.
  18. 18. The positive electrode plate is characterized by comprising a positive electrode aluminum foil and the positive electrode slurry according to any one of claims 1-5, wherein the positive electrode slurry is coated on the surface of the positive electrode aluminum foil.
  19. 19. The positive electrode tab of claim 18, wherein the positive electrode tab has positive electrode tabs formed at an end thereof, the number of positive electrode tabs being greater than or equal to 2.
  20. 20. The negative electrode plate is characterized by comprising a negative electrode aluminum foil and the negative electrode slurry according to any one of claims 9-14, wherein the negative electrode slurry is coated on the surface of the negative electrode aluminum foil.

Description

Positive and negative electrode slurry, preparation method thereof, positive and negative electrode plates and sodium ion battery Technical Field The invention relates to the technical field of sodium ion batteries, in particular to positive and negative electrode slurry and a preparation method thereof, a positive and negative electrode plate and a sodium ion battery. Background The battery is required to have high multiplying power and high energy density in the use fields of automobile start-stop batteries, tool battery cores and the like, and the common positive electrode material of the sodium ion battery is layered oxide or Prussian blue to be manufactured into a winding type multipolar ear structure, however, the multipolar ear sodium ion battery adopting the positive electrode material is complex in process, inflammable or toxic gas is easy to separate out at high temperature, and the risk is high. Disclosure of Invention The embodiment of the invention provides photovoltaic equipment. The positive electrode slurry for the battery comprises a polyanion active material, a carbon nano tube, superconducting carbon black, polyvinylidene fluoride and an organic solvent, wherein the polyanion active material, the carbon nano tube, the superconducting carbon black and the polyvinylidene fluoride are mixed and dispersed in the organic solvent, and the mass percentage of the polyanion active material, the carbon nano tube, the superconducting carbon black and the polyvinylidene fluoride is 90.0% -98.0% > (0.4% -3.0% >) (0.4% -4.0% >) (1.2% -3.0%). The positive electrode slurry of the embodiment of the application is applied to a sodium ion battery, and the use of layered oxide or Prussian blue in a positive electrode material is canceled while higher discharge multiplying power is realized, so that the safety of the sodium ion battery is improved. In some embodiments, the mass percentage of the polyanion active material, the carbon nanotube, the superconductive carbon black and the polyvinylidene fluoride in the positive electrode slurry is (93.0% -95.0%), 1.0% -2.5%, 1.2% -2.5%. In some embodiments, the positive electrode slurry is coated on the surface of the positive electrode current collector of the battery, and the coating density of the positive electrode slurry is 13.0mg/cm 2～30.4mg/cm2. In some embodiments, the coating density of the positive electrode slurry is 13.5mg/cm 2～25.2mg/cm2. In some embodiments, the organic solvent comprises at least N-methylpyrrolidone or acetone. The embodiment of the application provides a preparation method of positive electrode slurry, which is used for preparing the positive electrode slurry of any embodiment, and comprises the following steps: providing polyvinylidene fluoride, superconducting carbon black, carbon nanotubes and polyanion active material in a dry powder state; mixing polyvinylidene fluoride, superconducting carbon black, carbon nanotubes and polyanion active material with an organic solvent to obtain a positive electrode slurry, wherein the organic solvent at least comprises N-methyl pyrrolidone or acetone. In some embodiments, the positive electrode slurry preparation method includes: Adding polyvinylidene fluoride into an organic solvent, and stirring to prepare polyvinylidene fluoride glue solution; adding superconducting carbon black into polyvinylidene fluoride glue solution, stirring and preparing mixed glue solution A; Adding the carbon nano tube into the mixed glue solution A, and stirring to prepare a mixed glue solution B; and adding the polyanion active material into the mixed glue solution B, stirring and preparing the anode slurry. In some embodiments, the positive electrode slurry preparation method includes: mixing polyvinylidene fluoride, superconducting carbon black, carbon nano tubes and polyanion active material, adding the mixture into an organic solvent, and stirring to obtain a mixture D; And adding an organic solvent into the mixture D, stirring and preparing the positive electrode slurry. The embodiment of the application provides a negative electrode slurry for a battery, which comprises a hard carbon active substance, superconducting carbon black, carboxymethyl cellulose, styrene-butadiene rubber and a water-based solvent, wherein the hard carbon active substance, the superconducting carbon black, the carboxymethyl cellulose and the styrene-butadiene rubber are mixed and dispersed in the water-based solvent, and the mass percentage of the hard carbon active substance, the superconducting carbon black, the carboxymethyl cellulose and the styrene-butadiene rubber is (90.0% -95.0%), 0.5% -4.0%, 0.2% -3.0%, and 1.2% -3.0%. In some embodiments, the mass percentage of the hard carbon active material, the superconducting carbon black, the carboxymethyl cellulose and the styrene-butadiene rubber in the anode slurry is 93.0% -94.5% > (1.0% -3.0% >) (0.5% -2.0% >) (1.5% -2.5% >). In some embodiments, the negative electrode slurry is