Electrode Drying Method

Patent metadata

Field	Value
Publication number	US-2019173075-A1
Application number	US-201716323696-A
Country	US
Kind code	A1
Filing date	Nov 6, 2017
Priority date	Dec 21, 2016
Publication date	Jun 6, 2019
Grant date	—

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

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; and drying the plurality of electrodes in a state in which the hygroscopic film is interposed between the adjacent ones of the plurality of electrodes, 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.

2 . 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; and drying the electrode sheet in a state in which the hygroscopic film is interposed between overlapping portions of the electrode sheet, wherein at least one of surfaces of the hygroscopic film that is disposed opposite the electrode sheet has an uneven structure.

3 . The electrode drying method according to claim 1 , wherein the uneven structure is a convex structure or a concave and convex combination structure.

4 . The electrode drying method according to claim 3 , wherein the uneven structure is any one selected from a group consisting of: a structure having embossed curved domes, a structure having embossed polygonal domes, a round tile structure having curved valleys and curved ridges, and a polygonal tile structure having polygonal valleys and polygonal ridges.

5 . (canceled)

6 . (canceled)

7 . The electrode drying method according to claim 1 , wherein the uneven structures formed on the opposite surfaces of the hygroscopic film are complementary concave and convex combination structures or corresponding convex structures.

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

9 . The electrode drying method according to claim 8 , wherein the alcohol fiber is made of a polyvinyl alcohol (PVA) resin.

10 . 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.

11 . (canceled)

12 . The electrode drying method according to claim 1 , wherein an adsorptive material that is capable of adsorbing moisture (H2O) is coated on at least one surface of the hygroscopic film.

13 - 16 . (canceled)

17 . An electrode manufactured through an electrode drying method according to claim 1 .

18 . The electrode drying method according to claim 2 , wherein the uneven structure is a convex structure or a concave and convex combination structure.

19 . The electrode drying method according to claim 18 , wherein the uneven structure is any one selected from a group consisting of: a structure having embossed curved domes, a structure having embossed polygonal domes, a round tile structure having curved valleys and curved ridges, and a polygonal tile structure having polygonal valleys and polygonal ridges.

20 . The electrode drying method according to claim 2 , wherein the uneven structures formed on the opposite surfaces of the hygroscopic film are complementary concave and convex combination structures or corresponding convex structures.

21 . The electrode drying method according to claim 2 , wherein the hygroscopic film is a film made of ester fiber, cellulose fiber, or alcohol fiber.

22 . The electrode drying method according to claim 21 , wherein the alcohol fiber is made of a polyvinyl alcohol (PVA) resin.

23 . The electrode drying method according to claim 2 , wherein a thickness of the hygroscopic film is equal to or smaller than a thickness of each of the plurality of electrodes.

24 . The electrode drying method according to claim 2 , wherein an adsorptive material that is capable of adsorbing moisture (H2O) is coated on at least one surface of the hygroscopic film.

25 . An electrode manufactured through an electrode drying method according to claim 2 .

Assignees

• Lg Chemical Ltd

Inventors

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

Classifications

• H01M4/621

  Binders · CPC title

• H01M4/0404 Primary

  by coating on electrode collectors · CPC title

• H01M4/1391

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

• H01M4/0471

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

• H01M4/04

  Processes of manufacture in general · CPC title