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Electrolytic copper foil, method for producing same, and anode for high capacity li secondary battery including same

A technology of electrolytic copper foil and anode, applied in the field of electrolytic copper foil, which can solve the problems of increasing surface resistance and achieve high discharge capacity retention and low resistance

Active Publication Date: 2020-06-12
SK NEXILIS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, oxygen in the surface layer of copper foil has the disadvantage of increasing the surface resistance

Method used

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  • Electrolytic copper foil, method for producing same, and anode for high capacity li secondary battery including same
  • Electrolytic copper foil, method for producing same, and anode for high capacity li secondary battery including same
  • Electrolytic copper foil, method for producing same, and anode for high capacity li secondary battery including same

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Embodiment Construction

[0030] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0031] figure 1 is a schematic diagram showing a cross-sectional structure of an electrolytic copper foil according to an embodiment of the present invention.

[0032] refer to figure 1 , the electrolytic copper foil 110 has a first exposed surface 110a and a second exposed surface 110b opposite to the first exposed surface 110a, and includes: a first protective layer 112 forming the first exposed surface 110a; forming the second exposed surface 110a; the second protective layer 113 on the exposed surface 110b; and the copper film 111 between the first protective layer 112 and the second protective layer 113 .

[0033] In the present invention, the electrolytic copper foil 110 has a predetermined thickness, for example, a thickness of 4 μm to 30 μm. In the case where the thickness of the copper foil is less than 4 μm, it leads to a decrease in ...

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Abstract

The present invention relates to a copper foil current collector having high adhesion to an anode active material of a Li secondary battery. The present invention provides an electrolytic copper foilhaving a first surface and a second surface, the electrolytic copper foil comprising: a first protective layer on a first surface side; a second protective layer on a second surface side; and a copperfilm between the first and second protective layers, wherein the electrolytic copper foil has an oxygen thickness (OT) of 1.5 nm or more on the second surface. According to the present invention, itis possible to provide an electrolytic copper foil current collector for a Li secondary battery having high adhesion to an active material and low electric resistance.

Description

technical field [0001] The present invention relates to an electrolytic copper foil, and more specifically relates to an electrolytic copper foil having high adhesion to an active material of a lithium secondary battery. Background technique [0002] With the widespread use of portable home appliances such as smart phones and notebooks and the popularity of hybrid vehicles, the demand for lithium batteries is increasing rapidly. [0003] In lithium secondary batteries, the anode current collector is generally made of electrolytic copper foil. Electrodeposited copper foil is manufactured by a foil-making process utilizing an electroplating method to form a shiny surface (shiny surface) with a relatively low roughness on one side of the manufactured electrolytic copper foil and a relatively high roughness surface on the other side. matte surface. An active material such as carbon (Carbon)-based paste is coated on the matte surface of the electrolytic copper foil. [0004] I...

Claims

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Application Information

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IPC IPC(8): C25D1/04C25D5/48C25D3/38H01M4/66H01M10/052
CPCH01M10/052C25D1/04C25D3/38Y02E60/10C23C22/27H01M4/667H01M4/661C25D5/48H01M4/0438H01M10/0525
Inventor 金星玟李颜娜
Owner SK NEXILIS CO LTD
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