Method of manufacturing secondary battery electrode containing PTC material and electrode manufactured thereby

Patent metadata

Field	Value
Publication number	US-10608289-B2
Application number	US-201515510070-A
Country	US
Kind code	B2
Filing date	Nov 19, 2015
Priority date	Dec 16, 2014
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

Disclosed herein is a method of manufacturing a secondary battery electrode containing a positive temperature coefficient (PTC) material, the method including (a) applying first slurry including a first mixture and a solvent mixed with each other to one surface of a planar current collector to generate a PTC material after drying, (b) applying second slurry including a second mixture, including an electrode active material, and a solvent mixed with each other to the first slurry applied to the current collector, which is in a non-dried state, and (c) drying the first slurry and the second slurry applied to the current collector.

First claim

The invention claimed is:

1. A method of manufacturing a secondary battery electrode containing a positive temperature coefficient (PTC) material, the method comprising:
(a) applying a first slurry comprising a first mixture and a solvent mixed with each other to one surface of a planar current collector to generate a PTC material after drying, wherein the first mixture comprises a polymer material, conductive particles, and a first binder;
(b) applying a second slurry comprising a second mixture, comprising an electrode active material, and a solvent mixed with each other to the first slurry, which is in a non-dried state such that a mixed layer is formed, wherein the second mixture comprises an electrode active material, a conducting agent, and a second binder; and
(c) drying the first slurry and the second slurry applied to the current collector, wherein the first slurry is applied to have a thickness of 0.1 μm to less than 20 μm, and the second slurry is applied to have a thickness of 5 μm to 300 μm, wherein the thickness of the second slurry is larger than the thickness of the first slurry.

2. The method according to claim 1 , wherein the first binder and the second binder have different compositions.

3. The method according to claim 1 , wherein the first binder and the second binder have a same composition.

4. The method according to claim 1 , wherein the polymer material has a content of 1 to 60 weight % based on a total weight of the first mixture.

5. The method according to claim 1 , wherein the conductive particles have a content of 1 to 60 weight % based on a total weight of the first mixture.

6. The method according to claim 1 , wherein the binder has a content of 1 to 60 weight % based on a total weight of the first mixture.

7. The method according to claim 1 , wherein, at step (a), the first slurry is applied using gravure coating or die coating.

8. The method according to claim 1 , wherein, at step (b), the second slurry is applied using die coating.

9. The method according to claim 1 , wherein, at step (b), the second slurry starts to be applied before completion of application of the first slurry over the one surface of the current collector.

10. The method according to claim 1 , wherein, at step (b), the first slurry is applied to at least a portion of the current collector, and the second slurry starts to be applied within 0.01 seconds to 5 minutes thereafter.

11. A secondary battery electrode manufactured by the method according to claim 1 .

12. The secondary battery electrode according to claim 11 , wherein the secondary battery electrode comprises:
a planar current collector;
a first mixture layer and a second mixture layer formed on the current collector, the first mixture layer containing a PTC material, the second mixture layer containing an electrode active material; and
a mixed layer located between the first mixture layer and the second mixture layer, the first mixture layer and the second mixture layer being mixed with each other in the mixed layer.

13. An electrode assembly comprising the secondary battery electrode according to claim 11 .

14. A secondary battery having the electrode assembly according to claim 13 received in a battery case together with an electrolytic solution.

15. A battery pack comprising the secondary battery according to claim 14 as a unit cell.

16. A device comprising the battery pack according to claim 15 as a power source.

17. The device according to claim 16 , wherein the device is selected from a group consisting of a mobile phone, a portable computer, a smartphone, a smart pad, a tablet PC, a netbook computer, a wearable electronic device, an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a power storage apparatus.

18. A method of manufacturing a secondary battery electrode containing a positive temperature coefficient (PTC) material, the method comprising:
(a) applying a first slurry comprising a first mixture and a solvent mixed with each other to one surface of a planar current collector to generate a PTC material after drying, wherein the first mixture comprises a polymer material, conductive particles, and a first binder;
(b) applying a second slurry comprising a second mixture, comprising an electrode active material, and a solvent mixed with each other to the first slurry, which is in a non-dried state such that a mixed layer is formed, and the second mixture comprises an electrode active material, a conducting agent, and a second binder; and
(c) drying the first slurry and the second slurry applied to the current collector, wherein the first slurry is applied to have a thickness of 0.1 μm to less than 20 μm using a gravure coating, and
the second slurry is applied to have a thickness of 5 μm to 300 μm using a die-coating, wherein the thickness of the second slurry is larger than the thickness of the first slurry.

19. The method of claim 1 , wherein the polymer material consists of a semi-crystalline thermoplastic polymer or a thermosetting polymer.

20. The method of claim 18 , wherein the polymer material consists of a semi-crystalline thermoplastic polymer or a thermosetting polymer.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Kyoung Ho
• Kim Je Young
• Hah Hoe Jin
• Kim Chae Ah

Classifications

• H01G11/28

  arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives · CPC title

• H01M10/4235 Primary

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01C7/02

  having positive temperature coefficient · CPC title

• H01M4/621

  Binders · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title