Method of Producing Electrode for All-Solid-State Battery with Improved Adhesive Strength

Patent metadata

Field	Value
Publication number	US-2022165999-A1
Application number	US-202117376743-A
Country	US
Kind code	A1
Filing date	Jul 15, 2021
Priority date	Nov 23, 2020
Publication date	May 26, 2022
Grant date	—

Abstract

A method of producing an electrode includes applying a binder solution comprising a first binder onto a substrate to form an undried adhesive layer, applying an electrode solution comprising an electrode active material and a second binder onto the undried adhesive layer to form an active material layer, and drying the undried adhesive layer and the active material layer.

First claim

What is claimed is:

1 . A method of producing an electrode, the method comprising:
applying a binder solution containing a first binder onto a substrate to form an undried adhesive layer; applying an electrode solution containing an electrode active material and a second binder onto the undried adhesive layer to form an active material layer; and drying the undried adhesive layer and the active material layer.

2 . The method according to claim 1 , wherein the first binder comprises at least one binder selected from the group consisting of butadiene rubber (BR), nitrile butadiene rubber (NBR), hydrogenated nitrile butadiene rubber (HNBR), polyvinylidene difluoride (PVDF), polytetrafluoroethylene (PTFE), carboxymethylcellulose (CMC), and combinations thereof.

3 . The method according to claim 1 , wherein the binder solution has a viscosity of 5,000 cp to 10,000 cp.

4 . The method according to claim 1 , wherein the second binder comprises at least one binder selected from the group consisting of butadiene rubber (BR), nitrile butadiene rubber (NBR), hydrogenated nitrile butadiene rubber (HNBR), polyvinylidene difluoride (PVDF), polytetrafluoroethylene (PTFE), carboxymethylcellulose (CMC), and combinations thereof.

5 . The method according to claim 1 , wherein the electrode solution has a viscosity of 5,000 cp to 10,000 cp.

6 . The method according to claim 1 , wherein a thickness ratio of the undried adhesive layer to the active material layer is 1:1 to 1:20.

7 . The method according to claim 1 , wherein forming the undried adhesive layer and forming the active material layer are repeatedly performed before the drying.

8 . The method according to claim 1 , wherein the drying is performed at 80 to 120° C.

9 . The method according to claim 1 , wherein the drying is performed for 10 minutes to 2 hours.

10 . The method according to claim 1 , wherein material exchange occurs between the undried adhesive layer and the active material layer during the drying to cause an interlayer boundary to disappear. ii. A method of producing an electrode for an all-solid-state battery, the method comprising:
forming an undried adhesive layer by applying a binder solution comprising a first binder and a solvent onto a current collector; forming an active material layer on the undried adhesive layer by applying an electrode solution comprising an electrode active material and a second binder onto the undried adhesive layer; and drying the undried adhesive layer and the active material layer, wherein material exchange occurs between the undried adhesive layer and the active material layer during the drying to produce the electrode.

12 . The method according to claim 11 , wherein the first binder comprises at least one selected from the group consisting of butadiene rubber (BR), nitrile butadiene rubber (NBR), hydrogenated nitrile butadiene rubber (HNBR), polyvinylidene difluoride (PVDF), polytetrafluoroethylene (PTFE), carboxymethylcellulose (CMC), and combinations thereof.

13 . The method according to claim 12 , wherein the solvent comprises at least one selected from the group consisting of butylate, toluene, xylene, anisole, hexane, heptane, dibromomethane, dichloroethane, dichlorohexane, ethanol, glycol ether, and combinations thereof.

14 . The method according to claim 13 , wherein the binder solution has a viscosity of 5,000 cp to 10,000 cp.

15 . The method according to claim 11 , wherein the second binder comprises at least one selected from the group consisting of butadiene rubber (BR), nitrile butadiene rubber (NBR), hydrogenated nitrile butadiene rubber (HNBR), polyvinylidene difluoride (PVDF), polytetrafluoroethylene (PTFE), carboxymethylcellulose (CMC), and combinations thereof.

16 . The method according to claim 11 , wherein the electrode solution further comprises a solid electrolyte and a second solvent.

17 . The method according to claim 11 , wherein the electrode solution has a viscosity of 5,000 cp to 10,000 cp.

18 . The method according to claim 11 , wherein a thickness ratio of the undried adhesive layer to the active material layer is 1:1 to 1:20.

19 . The method according to claim 11 , wherein the drying is performed at a temperature of 80 to 120° C. for a time period of 10 minutes to 2 hours.

20 . The method according to claim 11 , wherein the first binder and the second binder are the same.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Kwon Tae Young
• Chung Gyeong Jun
• Lee Ju Yeon
• Jung Sung Hoo
• Kim Sang Mo
• Seok Hoon

Classifications

• H01M4/139 Primary

  Processes of manufacture · CPC title

• H01M4/622

  being polymers · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M4/0404 Primary

  by coating on electrode collectors · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title