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CN-122000359-A - Current collector comprising conductive primer layer and all-solid-state battery comprising same

CN122000359ACN 122000359 ACN122000359 ACN 122000359ACN-122000359-A

Abstract

Disclosed are a current collector having a primer layer comprising a conductive material and a binder having a three-dimensional network structure, an electrode for an all-solid-state battery including the current collector, and a method of manufacturing the electrode for an all-solid-state battery.

Inventors

  • WEN CHENGHUAN
  • ZHENG JINGJUN
  • LI SHAOLI
  • Cui Seqi
  • LI ZHUYAN
  • Jin Zhongding

Assignees

  • 现代自动车株式会社
  • 起亚株式会社

Dates

Publication Date
20260508
Application Date
20250620
Priority Date
20241104

Claims (20)

  1. 1. A current collector, comprising: A substrate, and A primer layer disposed on the substrate, Wherein the primer layer comprises a conductive material and an adhesive having a three-dimensional network structure, Wherein the adhesive having a three-dimensional network structure comprises a cross-link between a polymer having an unsaturated bond and a vulcanizing agent.
  2. 2. The current collector of claim 1, wherein the conductive material is a spherical conductive material.
  3. 3. The current collector according to claim 1, wherein the BET specific surface area of the conductive material is 50m 2 /g or greater and 100m 2 /g or less.
  4. 4. The current collector according to claim 1, wherein the polymer having an unsaturated bond is at least one selected from the group consisting of styrene-butadiene rubber, nitrile-butadiene rubber and butadiene rubber.
  5. 5. The current collector of claim 1, wherein the vulcanizing agent comprises a sulfur donor and a vulcanization accelerator.
  6. 6. The current collector of claim 5, wherein the weight ratio of the sulfur donor to the vulcanization accelerator is in the range of 1:1 to 1:5.
  7. 7. The current collector according to claim 1, wherein a weight ratio of the polymer having an unsaturated bond to the vulcanizing agent is in a range of 5:1 to 10:1.
  8. 8. The current collector according to claim 1, wherein a weight ratio of the conductive material to the binder having a three-dimensional network structure is in a range of 1:1 to 1:4.
  9. 9. The current collector according to claim 1, wherein the primer layer has a thickness of 0.1 μm or more and 20 μm or less.
  10. 10. The current collector of claim 1, wherein the substrate comprises at least one metal selected from Al, ti, ni, cu and SUS.
  11. 11. The current collector according to claim 1, wherein the thickness of the substrate is 3 μm or more and 30 μm or less.
  12. 12. A current collector according to claim 1, wherein the substrate is in the form of a foil, mesh or foam.
  13. 13. An electrode for an all-solid state battery, comprising: a current collector according to any one of claims 1 to 12, and An electrode layer disposed on the current collector, Wherein the electrode layer contains an electrode active material and a solid electrolyte.
  14. 14. A method of manufacturing an electrode for an all-solid battery, the method comprising the steps of: s1, preparing primer layer slurry containing conductive material, polymer with unsaturated bond and vulcanizing agent; s2, coating the primer layer slurry on a substrate to have a predetermined thickness, and drying the primer layer slurry to form a primer layer on the substrate; S3 step of additionally coating and drying an electrode slurry containing an electrode active material and a solid electrolyte on the primer layer to thereby form an electrode layer on the primer layer, and And S4, drying the primer layer under the temperature condition of 120 ℃ or more and 180 ℃ or less so as to crosslink the polymer with unsaturated bonds and the vulcanizing agent.
  15. 15. The method for manufacturing an electrode for an all-solid battery according to claim 14, wherein a weight ratio of the electrode active material to the solid electrolyte in the electrode slurry is in a range of 3:1 to 5:1.
  16. 16. The method for manufacturing an electrode for an all-solid battery according to claim 14, wherein the electrode slurry contains a binder, a dispersant, and a conductive material in addition to the electrode active material and the solid electrolyte, and the content of the binder is 1 to 3 parts by weight, the content of the dispersant is 0 to 1 part by weight, and the content of the conductive material is 1 to 2 parts by weight, based on 100 parts by weight of the combination of all materials contained in the electrode slurry.
  17. 17. The method for manufacturing an electrode for an all-solid battery according to claim 14, wherein the primer layer slurry and the electrode slurry each contain an organic solvent, Wherein the organic solvent is at least one selected from butyl butyrate, hexyl butyrate, benzyl acetate, o-xylene, toluene, dibromomethane and anisole.
  18. 18. The method for manufacturing an electrode for an all-solid battery according to claim 14, wherein the drying in step S2 is performed at 90 ℃ to 120 ℃ for 60 minutes or less.
  19. 19. The method for manufacturing an electrode for an all-solid battery according to claim 14, wherein the drying in step S3 is performed at 90 ℃ to 120 ℃ for 60 minutes or less.
  20. 20. An all-solid battery comprising the electrode for an all-solid battery according to claim 13.

Description

Current collector comprising conductive primer layer and all-solid-state battery comprising same Cross Reference to Related Applications The present application claims priority from korean patent application No. 10-2024-0154679, filed on the korean intellectual property office on month 4 of 2024, the entire contents of which are incorporated herein by reference. Technical Field The present invention relates to a current collector having a primer layer disposed on one surface of a substrate, the primer layer comprising a conductive material and an adhesive having a three-dimensional network structure to maximize adhesion thereof to an electrode layer, thereby improving performance and durability of an all-solid battery, an electrode for an all-solid battery comprising the current collector, and an all-solid battery comprising the electrode. Background All-solid-state batteries have the advantage of ensuring high energy density and safety, and are attracting attention as a new battery that can replace existing lithium ion batteries. However, since all-solid batteries use solids as electrolytes, minimizing the resistance at the interface between the current collector and the electrode layer and the interface between the electrode layer and the solid electrolyte layer is a necessary task to improve battery characteristics. In particular, the adhesion at the interface between the current collector and the electrode layer is low, which may cause solid particles to easily fall off from the electrode during manufacturing, and an increase in resistance at the interface may occur due to a decrease in contact area during repeated charge and discharge. These problems may have greater adverse effects as the charge and discharge process continues, and may reduce the movement paths of electrons and ions, reduce charge and discharge efficiency, and may rapidly deteriorate the overall durability of the battery, significantly reducing the electrochemical performance of the all-solid battery. Accordingly, there is a need for a current collector design with a new structure that maximizes adhesion at the interface between the electrode layer and the current collector while maintaining unique properties of the current collector. Disclosure of Invention The present invention aims to solve the above-mentioned problems occurring in the prior art while maintaining the advantages achieved by the prior art. An aspect of the present invention provides a current collector capable of solving the above-described problems, an electrode for an all-solid-state battery including the current collector, and an all-solid-state battery including the electrode. More particularly, the present invention provides a current collector including a primer layer disposed on one surface of a substrate, the primer layer including a conductive material and a binder having a three-dimensional network structure to maximize adhesion between the primer layer and an electrode layer and minimize volume change during charge/discharge, thereby minimizing degradation of durability of an electrode and an all-solid battery. The technical problems to be solved by the present invention are not limited to the above-described problems, and any other technical problems not mentioned herein will be clearly understood by those skilled in the art to which the present invention pertains from the following description. To achieve the object, (1) the present invention provides a current collector comprising a substrate, and a primer layer disposed on the substrate, wherein the primer layer comprises a conductive material and an adhesive having a three-dimensional network structure, wherein the adhesive of the three-dimensional network structure comprises a cross-link between a polymer having an unsaturated bond and a vulcanizing agent. (2) The present invention provides the current collector of (1), wherein the conductive material is a spherical conductive material. (3) The present invention provides the current collector of (1) or (2), wherein the BET specific surface area of the conductive material is about 50m 2/g or greater and about 100m 2/g or less. (4) The present invention provides the current collector of any one of (1) to (3), wherein the polymer having an unsaturated bond is at least one selected from the group consisting of styrene-butadiene rubber, nitrile-butadiene rubber and butadiene rubber. (5) The present invention provides the current collector of any one of (1) to (4), wherein the vulcanizing agent includes a sulfur donor and a vulcanization accelerator. (6) The present invention provides the current collector of any one of (1) to (5), wherein the weight ratio of the sulfur donor to the vulcanization accelerator is in the range of 1:1 to 1:5. (7) The present invention provides the current collector of any one of (1) to (6), wherein the weight ratio of the polymer having an unsaturated bond to the vulcanizing agent is in the range of 5:1 to 10:1. (8) The presen