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US-20260128326-A1 - CURRENT COLLECTOR COMPRISING CONDUCTIVE PRIMER LAYER AND ALL-SOLID-STATE BATTERY COMPRISING THE SAME

US20260128326A1US 20260128326 A1US20260128326 A1US 20260128326A1US-20260128326-A1

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 comprising the current collector, an all-solid-state battery comprising the same, and a method for manufacturing the electrode for the all-solid-state battery.

Inventors

  • Seung Hwan Moon
  • Gyeong Jun Chung
  • So Ri LEE
  • Seul Gi CHOI
  • Ju Yeon Lee
  • Jong Jung Kim

Assignees

  • HYUNDAI MOTOR COMPANY
  • KIA CORPORATION

Dates

Publication Date
20260507
Application Date
20250528
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 a binder having a three-dimensional network structure, wherein the binder of the three-dimensional network structure comprises a crosslinking 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 sphere-type conductive material.
  3. 3 . The current collector of claim 1 , wherein a BET specific surface area of the conductive material is 50 m 2 /g or greater and 100 m 2 /g or smaller.
  4. 4 . The current collector of claim 1 , wherein the polymer having the unsaturated bond is at least one selected from a 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 a weight ratio between the sulfur donor and the vulcanization accelerator is in a range of 1:1 to 1:5.
  7. 7 . The current collector of claim 1 , wherein a weight ratio between the polymer having the unsaturated bond and the vulcanizing agent is in a range of 5:1 to 10:1.
  8. 8 . The current collector of claim 1 , wherein a weight ratio between the conductive material and the binder of the three-dimensional network structure is in a range of 1:1 to 1:4.
  9. 9 . The current collector of claim 1 , wherein a thickness of the primer layer is 0.1 μm or larger and 20 μm or smaller.
  10. 10 . The current collector of claim 1 , wherein the substrate comprises at least one metal selected from a group consisting of Al, Ti, Ni, Cu, and SUS.
  11. 11 . The current collector of claim 1 , wherein a thickness of the substrate is 3 μm or larger and 30 μm or smaller.
  12. 12 . The current collector of claim 1 , wherein the substrate is present in a form of a foil, a mesh, or a foam.
  13. 13 . An electrode for an all-solid-state battery, comprising: the current collector according to claim 1 ; and an electrode layer disposed on the current collector, wherein the electrode layer comprises an electrode active material and a solid electrolyte.
  14. 14 . A method for manufacturing an electrode for an all-solid-state battery, the method comprising: preparing a primer layer slurry comprising a conductive material, a polymer having an unsaturated bond, and a vulcanizing agent; applying the primer layer slurry on a substrate so as to have a predetermined thickness and drying the primer layer slurry to form a primer layer on the substrate; additionally applying and drying an electrode slurry comprising an electrode active material and a solid electrolyte on the primer layer to form an electrode layer on the primer layer; and drying the primer layer under a temperature condition of 120° C. or higher and 180° C. or lower to perform a crosslinking between the polymer having the unsaturated bond and the vulcanizing agent.
  15. 15 . The method for manufacturing the electrode for the all-solid-state battery of claim 14 , wherein a weight ratio between the electrode active material and the solid electrolyte in the electrode slurry is in a range of 3:1 to 5:1.
  16. 16 . The method for manufacturing the electrode for the all-solid-state battery of claim 14 , wherein a content of the binder is 1 to 3 parts by weight, a content of the dispersant is 0 to 1 part by weight, and a content of the conductive material is 1 to 2 parts by weight, based on 100 parts by weight of a combination of all materials contained in the electrode slurry.
  17. 17 . The method for manufacturing the electrode for the all-solid-state battery of claim 14 , wherein each of the primer layer slurry and the electrode slurry comprises an organic solvent, wherein the organic solvent is at least one selected from the group consisting of butyl butyrate, hexyl butyrate, benzyl acetate o-xylene, toluene, dibromomethane, and anisole.
  18. 18 . The method for manufacturing the electrode for the all-solid-state battery of claim 14 , wherein the drying in the (S2) is performed at 90° C. to 120° C. for 60 minutes or smaller.
  19. 19 . The method for manufacturing the electrode for the all-solid-state battery of claim 14 , wherein the drying in the (S3) is performed at 90° C. to 120° C. for 60 minutes or smaller.
  20. 20 . An all-solid-state battery comprising the electrode for the all-solid-state battery according to claim 13 .

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the benefit of priority to Korean Patent Application No. 10-2024-0154679, filed in the Korean Intellectual Property Office on Nov. 4, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to a current collector which has a primer layer disposed on one surface of a substrate and comprising a conductive material and a binder having a three-dimensional network structure to maximize adhesion thereof to an electrode layer, thereby improving performance and durability of an all-solid-state battery, an electrode for an all-solid-state battery comprising the same, and an all-solid-state battery comprising the same. BACKGROUND All-solid-state batteries have the advantage of securing high energy density and safety, and are in the spotlight as a new type of battery that may replace existing lithium-ion batteries. However, since the all-solid-state battery uses a solid as an electrolyte, 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 an essential task for enhancing the characteristics of the cell. In particular, the low adhesion force at the interface between the current collector and the electrode layer may induce easy separation of solid particles from the electrode during the process, and an increase in resistance at the interface due to a decrease in the contact area during the repeated charge/discharge process may occur. These problems may have a greater adverse effect while the charge/discharge process is continued, and reduce the movement path of electrons and ions to reduce the charge/discharge efficiency, and may rapidly deteriorate the overall durability of the battery to significantly reduce the electrochemical performance of the all-solid-state battery. Therefore, there is a need for a current collector design having a new structure capable of maintaining the unique performance of the current collector while maximizing the adhesive force at the interface between the electrode layer and the current collector. SUMMARY The present disclosure has been made to solve the above-mentioned problems occurring in the prior art while advantages achieved by the prior art are maintained intact. An aspect of the present disclosure provides a current collector capable of solving the above problems, an electrode for an all-solid-state battery comprising the same, and an all-solid-state battery comprising the same. More specifically, the present disclosure provides a current collector comprising a primer layer disposed on one surface of a substrate and comprising a conductive material and a binder having a three-dimensional network structure to maximize the adhesive force between the primer layer and an electrode layer and to minimize volume change during a charging/discharging process, thereby minimizing the durability deterioration of an electrode and an all-solid-state battery. The technical problems to be solved by the present disclosure are not limited to the aforementioned problems, and any other technical problems not mentioned herein will be clearly understood from the following description by those skilled in the art to which the present disclosure pertains. In order to achieve the purpose, (1) the present disclosure provides a current collector comprising: a substrate; and a primer layer disposed on the substrate, wherein the primer layer comprises a conductive material and a binder having a three-dimensional network structure, wherein the binder of the three-dimensional network structure comprises a crosslinking between a polymer having an unsaturated bond and a vulcanizing agent. (2) The present disclosure provides the current collector of the (1), wherein the conductive material is a sphere-type conductive material. (3) The present disclosure provides the current collector of the (1) or (2), wherein a BET specific surface area of the conductive material is about 50 m2/g or greater and about 100 m2/g or smaller. (4) The present disclosure provides the current collector of one of the (1) to (3), wherein the polymer having the unsaturated bond is at least one selected from a group consisting of styrene-butadiene rubber, nitrile-butadiene rubber, and butadiene rubber. (5) The present disclosure provides the current collector of one of the (1) to (4), wherein the vulcanizing agent comprises a sulfur donor and a vulcanization accelerator. (6) The present disclosure provides the current collector of one of the (1) to (5), wherein a weight ratio between the sulfur donor and the vulcanization accelerator is in a range of 1:1 to 1:5. (7) The present disclosure provides the current collector of one of the (1) to (6), wherein a weight ratio between the polymer having the unsaturated bond and the vulcanizing agent is in a range of 5:1 to 10:1. (8) The present disclosure