Electrode for secondary battery including carbon nanotube sheet

Patent metadata

Field	Value
Publication number	US-2019027755-A1
Application number	US-201716069296-A
Country	US
Kind code	A1
Filing date	Oct 19, 2017
Priority date	Oct 26, 2016
Publication date	Jan 24, 2019
Grant date	—

Abstract

The present disclosure provides an electrode for a secondary battery, characterized in that a carbon nanotube sheet is provided on one surface or both surfaces of a current collector, and an electrode mixture layer containing an electrode active material is applied on the carbon nanotube sheet.

First claim

1 . An electrode for a secondary battery comprising:
a carbon nanotube sheet provided on one surface or both surfaces of a collector, an electrode mixture layer containing an electrode active material which is coated onto the carbon nanotube sheet

2 . The electrode for a secondary battery according to claim 1 , wherein the carbon nanotube sheet has a sheet structure including a plurality of pores.

3 . The electrode for a secondary battery according to claim 2 , wherein the carbon nanotube sheet has a porosity of 40% to 80%.

4 . The electrode for a secondary battery according to claim 1 , wherein the electrode mixture layer is formed by applying an electrode mixture slurry in which an electrode active material, a conductive material, and a binder are mixed onto the carbon nanotube sheet provided on the one surface or both surfaces of the current collector, and drying and rolling the nanotube sheet.

5 . The electrode for a secondary battery according to claim 4 , wherein at least a part of the electrode mixture slurry penetrates into and bond to the pore of the carbon nanotube sheet to form the electrode mixture layer.

6 . The electrode for a secondary battery according to claim 5 , wherein the carbon nanotube sheet is bonded to the current collector by the binder of the electrode mixture slurry penetrating the pore.

7 . The electrode for a secondary battery according to claim 1 , wherein the carbon nanotube sheet has a thickness of 5 micrometers to 20 micrometers.

8 . The electrode for a secondary battery according to claim 1 , wherein the carbon nanotube sheet is provided on at least 50% of a total area of the one surface of the current collector.

9 . The electrode for a secondary battery according to claim 8 , wherein the carbon nanotube sheet is provided on 100% of the total area of the one surface of the current collector.

10 . An apparatus for manufacturing the electrode for a secondary battery according to claim 1 , comprising:
a first roller on which a long sheet-like carbon nanotube sheet is wound; a second roller on which a long sheet-like current collector is wound; a third roller configured to simultaneously wind the current collector and the carbon nanotube sheet in a state in which the carbon nanotube sheet is provided on the current collector; a fourth roller configured to simultaneously support the current collector and the carbon nanotube sheet on a lower surface of the current collector between the first roller or the second roller and the third roller so that the carbon nanotube sheet is adhered to an upper surface of the current collector; and a slurry applying portion configured to apply an electrode mixture slurry to an upper surface of the carbon nanotube sheet provided on the current collector between the third roller and the fourth roller.

11 . The apparatus according to claim 10 , wherein:
the first roller is located at the same height as an extension line or at a relatively low height relative to the extension line with respect to the extension line connecting the third roller and the fourth roller so that the carbon nanotube sheet remains in a tensioned state due to tension applied to the carbon nanotube sheet located at a low height; and the second roller is located at a relatively low height relative to the first roller with respect to the extension line so that the current collector is supplied to a portion opposite the slurry applying portion.

12 . The apparatus according to claim 10 , further comprising:
a drying unit configured to dry the electrode mixture slurry applied onto the carbon nanotube sheet; and a roller configured to roll a carbon nanotube sheet disposed on the current collector and the dried electrode mixture slurry to form an electrode mixture layer.

13 . A method of manufacturing the electrode for a secondary battery according to claim 1 , comprising:
a) a process of simultaneous supplying and closely adhering a carbon nanotube sheet onto a current collector continuously supplied; b) a process of applying an electrode mixture slurry onto the carbon nanotube sheet placed in close contact with the current collector; and c) a process of drying and rolling the current collector coated with the electrode mixture slurry to form an electrode mixture layer.

14 . The method according to claim 13 , wherein:
in process a), carbon nanotubes are supplied to a position lower than or equal to a height at which the electrode mixture slurry is applied; and the current collector is supplied at a relatively low height when compared with the carbon nanotube sheet.

15 . The method according to claim 13 , wherein at least a part of the electrode mixture slurry applied in process b) penetrates into pores of the carbon nanotube sheet and bonds to form the electrode mixture layer.

Assignees

• Lg Chemical Ltd

Inventors

• You Min Kyu
• Uhm In Sung
• Mok Eun Kyung

Classifications

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/13 Primary

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

• H01M4/667

  in the form of layers, e.g. coatings · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M4/0402

  Methods of deposition of the material · CPC title