Surface treatment method for copper foil, surface treated copper foil and copper foil for negative electrode collector of lithium ion secondary battery

A technology of surface treatment and copper foil, which is applied in the field of copper foil for negative electrode collectors, can solve the problems of increasing battery size and failing to meet long-term life, and achieves excellent adhesion and ultrasonic adhesion, and compatibility with active materials Excellent adhesion and ultrasonic adhesion

Inactive Publication Date: 2013-01-16
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The negative electrode current collector of lithium-ion rechargeable batteries is made by coating carbon (graphite) mixed with a binder (binder) as an active material on both surfaces of copper foil, pressurized, and dried. In the case of high-capacity and long-term charging and discharging, it cannot meet the needs of applications such as hybrid vehicles or electric vehicles.
[0005] For example, the current collection capacity of the negative electrode current collector can be increased by increasing the thickness of the active material composed of carbon mixed with the binder, but it is technically difficult to form a uniform thickness on both sides of the copper foil used as the current collector. Layered carbon
Moreover, the thicker layer of carbon active material increases the size of the battery, which is also inappropriate

Method used

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  • Surface treatment method for copper foil, surface treated copper foil and copper foil for negative electrode collector of lithium ion secondary battery
  • Surface treatment method for copper foil, surface treated copper foil and copper foil for negative electrode collector of lithium ion secondary battery
  • Surface treatment method for copper foil, surface treated copper foil and copper foil for negative electrode collector of lithium ion secondary battery

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Experimental program
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no. 1 approach

[0046] The surface treatment method of copper foil and the surface-treated copper foil according to the first embodiment of the present invention will be described.

[0047] Substrate

[0048] In the first embodiment of the present invention, the substrate to be subjected to surface treatment is made of copper (oxygen-free copper, Oxygen-free copper) that does not undergo surface treatment (hereinafter referred to as untreated) and does not contain oxygen. Rolled copper foil (hereinafter referred to as untreated oxygen-free rolled copper foil).

[0049] When the rolled copper foil made of oxygen-free copper is used, the ingot rolled into copper foil does not contain impurities, and the properties of the copper foil do not change, and there is no concern about brittleness in particular.

[0050] As a method of roughening the surface of the base material, for example, as a negative electrode current collector used in lithium-ion rechargeable batteries, in order to improve the...

specific example

[0117] For example, the conveying speed is set to 6-12 m / min, the flow rate of the copper-sulfuric acid electrolyte solution 12 (the first circulation laminar flow velocity) is set to 3-6 m / min, and the electrolysis treatment time is set to 2.5-5.0 seconds.

[0118] Copper-sulfuric acid electrolyte

[0119] As the copper-sulfuric acid electrolytic solution 12, for example, copper sulfate is 20 ~ 30g / L in terms of copper, and the concentration of sulfuric acid is expressed in H 2 SO 4 Calculation is 90~110g / L, sodium molybdate is 0.15~0.35g / L in terms of Mo, chlorine is 0.005~0.010g / L in terms of chloride ion conversion, and these mixed electrolytes are set at a bath temperature of 18.5~ 28.5°C.

[0120] Pulse cathodic electrolytic plating treatment

[0121] Apply a pulsed current density between the power supply contact roller 7 and the iridium oxide anode 11, that is, set the pulsed cathodic electrolytic plating current density to, for example, 22 to 31.5 A / dm 2 .

[0...

Embodiment 1

[0152] As the base material, the following copper foil is used, the copper foil is composed of oxygen-free rolled copper A, the untreated rolled copper foil A having a thickness of 0.018 mm, in terms of surface roughness Rz specified in JIS-B-0601, Its surface roughness was 0.8 μm, and its elongation at room temperature (for example, 25° C.) was 6.2%. Roughening treatment was performed on both surfaces of this copper foil under the following conditions.

[0153] In this roughening treatment, it is divided into the roughening treatment carried out on the copper foil surface and the roughening treatment carried out on the back side of the copper foil separated by the shielding plate 13. The surface of the foil is roughened, and the back of the copper foil is roughened from the bottom to the outlet side of the tank. Regarding the current applied between the power supply contact roller 7 and the iridium oxide anode 11, the opening time is set to 10ms, and the closing time is 60ms ...

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Abstract

Disclosed is a copper foil for a negative electrode collector capable of simultaneously achieving high capacity and long life charge / discharge cycles in a secondary battery, wherein the front and rear surfaces are of a uniform shape and, for example, the properties of a silicon active material of a lithium ion secondary battery are sufficiently manifested; and a negative electrode using the copper foil. In one embodiment, a first roughened layer of metallic copper is formed by pulse cathode electrolysis roughening treatment on the surface of an untreated rolled copper foil substrate of oxygen-free copper in a first roughening treatment vessel (1) filled with a copper-sulphuric acid electrolyte (12), and a second copper-plate layer is formed on the surface of the first roughened layer by smooth copper plating treatment in a second copper plating treatment vessel (2) filled with a copper-sulphuric acid electrolyte (22).

Description

technical field [0001] The present invention relates to a surface treatment method of copper foil, a surface-treated copper foil, and a copper foil for a negative electrode current collector of a lithium ion rechargeable battery using the surface-treated copper foil. Background technique [0002] For lithium-ion rechargeable batteries, the characteristics of the negative electrode affect the charging and discharging characteristics of the rechargeable battery and the quality of maintaining a high potential in the same way as the positive electrode. [0003] Considering the negative electrode, especially the negative electrode current collector, it is necessary to increase the current collection capacity of the negative electrode current collector due to the increase in the capacity of lithium-ion rechargeable batteries. [0004] The negative electrode current collector of lithium-ion rechargeable batteries is made by coating carbon (graphite) mixed with a binder (binder) as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66C23F11/00C25D7/06H01M4/134H01M4/1395H01M4/74
CPCC25D5/48H01M4/667Y02E60/122C25D5/34C25D3/38H01M4/661H01M4/1395H01M4/0452C25D7/0628C23C30/00H01M4/134Y02E60/10C23F11/00C25D7/06H01M4/66
Inventor 小黑了一
Owner FURUKAWA ELECTRIC CO LTD
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