Unlock instant, AI-driven research and patent intelligence for your innovation.

Surface treatment method of negative current collector copper foil of lithium ion battery

A lithium-ion battery, surface treatment technology, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve problems such as corrosion and dissolution, and achieve the effects of improving adhesion, preventing shedding, and preventing corrosion

Active Publication Date: 2013-08-07
HEFEI GUOXUAN HIGH TECH POWER ENERGY
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to solve the problem of corrosion and dissolution of lithium-ion battery negative electrode current collector copper foil in conventional organic electrolytes, to provide a method that can effectively prevent the electrolyte from corroding the copper foil, and has basically no negative effect on the normal charge and discharge performance of the battery. Affected surface treatment method of lithium ion battery negative electrode current collector copper foil

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Surface treatment method of negative current collector copper foil of lithium ion battery
  • Surface treatment method of negative current collector copper foil of lithium ion battery
  • Surface treatment method of negative current collector copper foil of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: ultrasonically treat 11um smooth copper foil in acetone for 1min to remove impurities such as oil stains on the surface of the copper foil, then take it out, rinse it twice with deionized water, and dry it in vacuum at 80°C; then place the cleaned copper foil on In 1mol / L LiN(SO 2 CF 3 ) 2 , 2-mercaptobenzothiazole concentration of 0.01mol / L DME solution, at 25 ℃, current density 0.3A / cm 2 After cathodic electrolysis for 60s under certain conditions, it was taken out, washed twice with acetone, and then vacuum-dried at room temperature to obtain a copper foil with a protective film on the surface. The protective film composition is mainly N(SO 2 CF 3 ) 2 - The reduction product of anion on the surface of copper foil can effectively prevent the electrolyte from corroding copper foil.

[0019] Such as Figure 1-4 as shown, figure 1 given untreated copper foil in 1M LiPF 6 / EC:DMC (volume ratio 1:1) electrolyte cyclic voltammogram, it can be seen that ...

Embodiment 2

[0023] Example 2: The 11um smooth copper foil was ultrasonically treated in ethanol for 2 minutes to remove oil and other impurities on the surface of the copper foil, then it was taken out, rinsed twice with deionized water, and dried in vacuum at 80°C. Then place the cleaned and dried copper foil in 1mol / L NH 4 N(SO 2 CF 3 ) 2 , 2-mercaptobenzimidazole concentration of 0.01mol / L MFA solution, at 25 ℃, current density 0.4A / cm 2 Under the conditions of cathodic electrolysis for 100s, it was taken out, washed twice with acetone, and then vacuum-dried at room temperature to obtain a copper foil with a protective film on the surface. The protective film composition is mainly N(SO 2 CF 3 ) 2 - The reduction product of anions on the surface of copper foil.

[0024] Mix the negative electrode active material, binder and conductive agent in the ratio of 90:2:8 to make the negative electrode slurry, which is evenly coated on the copper foil with and without surface treatment, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a surface treatment method of a negative current collector copper foil of a lithium ion battery, which belongs to the technical field of battery preparation. The method comprises the following steps of: performing ultrasonic treatment on the copper foil in an organic solvent to remove the impurities such as oil stains and the like on the surface of the copper foil, then taking the copper foil out of the organic solvent, cleaning copper foil by using deionized water, and performing vacuum drying on the copper foil under the condition that the temperature is between the room temperature and 80 DEG C; performing cathodic electrolysis on the cleaned copper foil for 30 to 150 seconds in an organic solvent of which the concentration of N(SO2CF3)2-anions is 0.7 to 1.5 mol / L and the concentration of an additive is 0.001 to 0.1 mol / L under the condition that the temperature is between 15 and 60 DEG C and the current density is 0.1 to 0.6A / cm<2>, and taking the copper foil out of the organic solvent; and cleaning the copper foil by using acetone, and performing vacuum drying on the copper foil to obtain a copper foil of which the surface comprises a layer of protective membrane. The protective membrane mainly comprises the component of a reduced product of the N(SO2CF3)2-anions on the surface of the copper foil, and can effectively prevent electrolyte from eroding the copper foil, thereby improving the chemical stability of the copper foil in the electrolyte and causing no negative influence on the normal charge and discharge performance of the battery.

Description

Technical field: [0001] The invention relates to a method for surface treatment of a lithium ion battery negative electrode current collector copper foil, which belongs to the technical field of battery preparation. Background technique [0002] At present, the polar aprotic solvents generally used in lithium-ion battery electrolytes are mainly carbonate organic solvents, such as EC, DMC, etc. The electrolytes composed of such solvents are not resistant to high voltage, and severe over-discharge will make the positive electrode potential higher than The negative electrode point is low (polarity reversal), and the electrolyte begins to decompose when the negative electrode potential exceeds 5V, which will cause the battery to catch fire or explode; at the same time, over-discharge of the battery composed of EC-based electrolyte will lead to the dissolution of the copper foil of the negative electrode current collector. This situation is more serious in high-voltage positive e...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/66
CPCY02E60/122Y02E60/10
Inventor 杨续来刘大军杨茂萍徐小明
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY