Electrode drying method

Patent metadata

Field	Value
Publication number	US-12040472-B2
Application number	US-202217592015-A
Country	US
Kind code	B2
Filing date	Feb 3, 2022
Priority date	Dec 21, 2016
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

Disclosed herein is an electrode drying method for drying a plurality of electrodes in the state in which the electrodes are stacked, the electrode drying method including interposing a hygroscopic film between adjacent ones of the electrodes and drying the electrodes in the state in which the hygroscopic film is interposed between the electrodes, wherein at least one of the surfaces of the hygroscopic film that faces the electrodes has an uneven structure, or an electrode drying method for drying an electrode sheet in the state in which the electrode sheet is wound, the electrode drying method including winding the electrode sheet with a hygroscopic film and drying the electrode sheet in the state in which the hygroscopic film is interposed between overlapping portions of the electrode sheet, wherein at least one of the surfaces of the hygroscopic film that is disposed opposite the electrode sheet has an uneven structure.

First claim

The invention claimed is:

1. An electrode drying method for drying a plurality of electrodes in a state in which the plurality of electrodes is stacked, the electrode drying method comprising:
interposing a hygroscopic film between adjacent ones of the plurality of electrodes to form a stack, in which the hygroscopic film is interposed between the adjacent ones of the plurality of electrodes; and
drying the stack in a drying furnace
wherein at least one surface of the hygroscopic film that faces one of the adjacent ones of the plurality of electrodes has an uneven structure defining airflow channels extending across the hygroscopic film from a first side to an opposing second side in a width dimension of the hygroscopic film, the uneven structure being any one selected from a group consisting of: a structure formed in the shape of waves having a round tile structure having curved valleys and curved ridges, and a structure formed in the shape of waves having a polygonal tile structure having polygonal valleys and polygonal ridges,
wherein, during the drying step, air within the drying furnace flows through the airflow channels between the adjacent ones of the plurality of electrodes to dry the electrodes.

2. The electrode drying method according to claim 1 , wherein an opposing surface of the hygroscopic film has a second uneven structure on an opposite side of the hygroscopic film from the at least one surface, wherein the second uneven structure is complementary to the uneven structure of the at least one surface.

3. The electrode drying method according to claim 1 , wherein the hygroscopic film is a film made of ester fiber, cellulose fiber, or alcohol fiber.

4. The electrode drying method according to claim 3 , wherein the alcohol fiber is made of a polyvinyl alcohol (PVA) resin.

5. The electrode drying method according to claim 1 , wherein a thickness of the hygroscopic film is equal to or smaller than a thickness of each of the plurality of electrodes.

6. The electrode drying method according to claim 1 , wherein an adsorptive material that is capable of adsorbing moisture (H 2 O) is coated on the at least one surface of the hygroscopic film.

7. An electrode drying method for drying an electrode sheet in a state in which the electrode sheet is wound, the electrode drying method comprising:
winding the electrode sheet with a hygroscopic film into a wound roll, in which the hygroscopic film is interposed between adjacent layers of the wound electrode sheet; and
drying the wound roll in a drying furnace
wherein at least one surface of the hygroscopic film that is disposed opposite the electrode sheet has an uneven structure defining airflow channels extending across the hygroscopic film from a first side to an opposing second side in a width dimension of the hygroscopic film, the uneven structure being any one selected from a group consisting of: a structure formed in the shape of waves having a round tile structure having curved valleys and curved ridges, and a structure formed in the shape of waves having a polygonal tile structure having polygonal valleys and polygonal ridges,
wherein, during the drying step, air within the drying furnace flows through the airflow channels between the adjacent layers of the wound electrode sheet to dry the electrode sheet.

8. The electrode drying method according to claim 7 , wherein an opposing surface of the hygroscopic film has a second uneven structure on an opposite side of the hygroscopic film from the at least one surface, wherein the second uneven structure is complementary to the uneven structure of the at least one surface.

9. The electrode drying method according to claim 7 , wherein the hygroscopic film is a film made of ester fiber, cellulose fiber, or alcohol fiber.

10. The electrode drying method according to claim 9 , wherein the alcohol fiber is made of a polyvinyl alcohol (PVA) resin.

11. The electrode drying method according to claim 7 , wherein a thickness of the hygroscopic film is equal to or smaller than a thickness of the electrode sheet.

12. The electrode drying method according to claim 7 , wherein an adsorptive material that is capable of adsorbing moisture (H 2 O) is coated on the at least one surface of the hygroscopic film.

Assignees

• Lg Energy Solution Ltd

Inventors

• Jeong Hee-Seok
• Lee Myung-Ki
• Song Joo-Yong
• Ahn Ji-Hee

Classifications

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/8882

  Heat treatment, e.g. drying, baking · CPC title

• H01M4/139 Primary

  Processes of manufacture · CPC title

• H01M4/04

  Processes of manufacture in general · CPC title

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title