Electrode structure including insulating layer, manufacturing method thereof, and electrochemical device including the electrode

Patent metadata

Field	Value
Publication number	US-2015243964-A1
Application number	US-201414430487-A
Country	US
Kind code	A1
Filing date	May 8, 2014
Priority date	May 8, 2013
Publication date	Aug 27, 2015
Grant date	—

Abstract

Disclosed is a method for manufacturing an electrode structure including (S 1 ) coating and drying a slurry for an electrode active material layer on an electrode current collector placed on a heated bottom surface, (S 2 ) coating and drying a slurry for an insulating layer including inorganic particles, a binder, and a solvent, on a heated roller located at a predetermined distance from the bottom surface, and (S 3 ) transferring the dried slurry for an insulating layer to the dried slurry for an electrode active material layer on the bottom surface, and thermo-compressing the dried slurry for an insulating layer and the dried slurry for an electrode active material layer, to form an insulating layer on an electrode surface.

First claim

1 . A method for manufacturing an electrode structure, comprising:
(S 1 ) coating and drying a slurry for an electrode active material layer on an electrode current collector placed on a heated bottom surface; (S 2 ) coating and drying a slurry for an insulating layer including inorganic particles, a binder, and a solvent, on a heated roller located at a predetermined distance from the bottom surface; and (S 3 ) transferring the dried slurry for an insulating layer to the dried slurry for an electrode active material layer on the bottom surface, and thermo-compressing the dried slurry for an insulating layer and the dried slurry for an electrode active material layer, to form an insulating layer on an electrode surface.

2 . The method for manufacturing an electrode structure according to claim 1 , wherein when thermo-compressing the dried slurry for an insulating layer and the dried slurry for an electrode active material layer, a porous substrate is interposed between the dried slurry for an insulating layer and the dried slurry for an electrode active material layer.

3 . The method for manufacturing an electrode structure according to claim 1 , wherein a temperature of the heated bottom surface is from 40 to 200° C.

4 . The method for manufacturing an electrode structure according to claim 1 , wherein a temperature of the heated roller is from 40 to 200° C.

5 . The method for manufacturing an electrode structure according to claim 1 , wherein a distance between the heated bottom surface and the heated roller is from 0.01 to 10 mm.

6 . The method for manufacturing an electrode structure according to claim 1 , wherein a pressing condition for the thermo-compression is from 1 to 500 kgf/cm 2 .

7 . The method for manufacturing an electrode structure according to claim 1 , wherein the bottom surface is a shape of a belt connected to a transfer means.

8 . The method for manufacturing an electrode structure according to claim 1 , wherein the solvent is any one solvent selected from the group consisting of acetone, tetrahydrofuran, methylene chloride, chloroform, dimethylformamide, dimethylacetamide, hexamethylphosphoamide, acetonitrile, cyclohexanone, N-methyl-2-pyrrolidone (NMP), cyclohexane, and water (distilled water), or mixtures thereof.

9 . The method for manufacturing an electrode structure according to claim 1 , wherein the binder is any one binder polymer selected from the group consisting of polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethylmethacrylate, polybutylacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethylpolyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxyl methyl cellulose (CMC), and styrene-butadiene rubber (SBR), or mixtures thereof.

10 . The method for manufacturing an electrode structure according to claim 1 , wherein a thickness of the thermo-compressed insulating layer is from 1 to 100 μm.

11 . The method for manufacturing an electrode structure according to claim 1 , wherein an average grain diameter of the inorganic particles is from 0.001 to 10 μm.

12 . The method for manufacturing an electrode structure according to claim 1 , wherein a weight ratio of the inorganic particles and the binder polymer is from 50:50 to 99:1.

13 . The method for manufacturing an electrode structure according to claim 1 , wherein a thickness of the thermo-compressed electrode active material layer is from 0.5 to 200 μm.

14 . The method for manufacturing an electrode structure according to claim 1 , wherein an electrode active material included in the slurry for an electrode active material layer is a cathode active material, and the electrode structure is a cathode structure.

15 . The method for manufacturing an electrode structure according to claim 1 , wherein an electrode active material included in the slurry for an electrode active material layer is an anode active material, and the electrode structure is an anode structure.

16 . An electrode structure manufactured by the method for manufacturing an electrode structure according to claim 1 .

17 . The electrode structure according to claim 16 , wherein the electrode structure comprises an electrode current collector, an electrode active material layer disposed on the current collector, and an insulating layer disposed on the electrode active material layer and formed from a slurry for an insulating layer including inorganic particles, a binder, and a solvent.

18 . An electrochemical device comprising a cathode, an anode, and an electrolyte solution, wherein the at least one of the cathode and the anode is the electrode structure according to claim 16 .

19 . The electrochemical device according to claim 18 , wherein the electrochemical device is a lithium secondary battery.

Assignees

• Lg Chemical Ltd

Inventors

• Yu In-Gyoung
• Kim Seok-Koo
• Hong Jang-Hyuk
• Jin Sun-Mi
• Kim Jong-Hun

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/043

  involving compressing or compaction · CPC title

• H01M4/1393

  of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/625

  Carbon or graphite · CPC title