Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of micropore copper foil used for negative electrode current collector of lithium ion battery

A lithium-ion battery and current collector technology, which is applied in the field of preparation of microporous copper foil for lithium-ion battery negative electrode current collectors, can solve the problems of large pore size and columnar pores, reduce porosity, accelerate overflow, and improve corrosion resistance Effect

Active Publication Date: 2018-10-12
SHANDONG JINBAO ELECTRONICS +1
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also porous copper prepared by solid-gas eutectic condensation method, all of which have the problem of large pore size and even columnar pores.

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
  • Preparation method of micropore copper foil used for negative electrode current collector of lithium ion battery
  • Preparation method of micropore copper foil used for negative electrode current collector of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The microporous copper foil for lithium ion battery negative electrode current collector is obtained through the following steps:

[0025] (1) Treatment of the titanium alloy roller 10: adding carbon powder with a particle size of 6um to the water-based working fluid to obtain the first working fluid 2, the concentration of the carbon powder in the first working fluid 2 being 20g / L. Such as figure 1 As shown, an insulating working fluid tank 1 with a circular cross section is placed on the base 5 of the magnetic stirring device, the first working fluid 2 is placed in the insulating working fluid tank 1, and the stirrer 6 of the magnetic stirring device goes deep into the working fluid tank The first magnet 4 is set outside the bottom wall of the working fluid tank, and the metal briquetting block 7 matched with the first magnet 4 is set in the insulating working fluid tank 1, and the metal briquetting block 7 is connected to the electric spark by a thick copper wire 3 w...

Embodiment 2

[0031]The difference between this example and Example 1 is that in step (1), carbon powder with a particle size of 8um is added to the water-based working fluid to obtain the first working fluid 2; The copper wire 3 is connected to the pulse power supply of the EDM machine tool; the discharge current of the EDM is 1.5A, the pulse width is 35us, and the pulse interval is 6us.

[0032] In step (2), the second working solution 11 is prepared by dissolving 55 parts by mass of copper sulfate, 95 parts by mass of sulfuric acid, 90 parts by mass of polyethylene glycol and 25 parts by mass of sodium bromide in 1000 parts by mass of water.

[0033] In step (3), the temperature is 35°C, the vibration frequency of the ultrasonic vibration device is 22Hz, and the current density in the second working fluid 11 is 0.45 A / cm 2 , the titanium alloy roller 10 is electroplated in the second working solution 11 for 20 seconds.

[0034] The microporous copper foil 16 prepared in this embodiment ...

Embodiment 3

[0036] The difference between this example and Example 1 is that in step (1), carbon powder with a particle size of 10um is added to the water-based working fluid to obtain the first working fluid 2; The copper wire 3 is connected to the pulse power supply of the EDM machine tool; the discharge current of the EDM is 2.1A, the pulse width is 40us, and the pulse interval is 7us.

[0037] In step (2), the second working solution 11 is prepared by dissolving 70 parts by mass of copper sulfate, 100 parts by mass of sulfuric acid, 100 parts by mass of polyethylene glycol and 30 parts by mass of sodium bromide in 1000 parts by mass of water.

[0038] In step (3), the temperature is 40°C, the vibration frequency of the ultrasonic vibration device is 25 Hz, and the current density in the second working fluid 11 is 0.55 A / cm 2 , the titanium alloy roller 10 is electroplated in the second working solution 11 for 25 seconds.

[0039] The microporous copper foil 16 prepared in this embodi...

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

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a micropore copper foil used for a negative electrode current collector of a lithium ion battery, and belongs to the technical field of an apparatus fordirectly converting chemical energy into electric energy. The preparation method comprises the steps of (1) processing a titanium alloy roller; (2) preparing a second working solution, comprising 40-70 parts of copper sulfate, 90-100 parts of sulfuric acid, 80-100 parts of polyethylene glycol, 20-30 parts of sodium bromide and 1,000 parts of water based on parts by mass; and (3) preparing the micropore copper foil. According to the method, the processed titanium alloy roller is adopted, so that corrosion resistance is improved and the purity of the copper foil is improved, thereby maintaininghigh conductivity of copper; in addition, the surface evenness of the titanium alloy roller is also improved, and distribution uniformity and dimensional uniformity of hydrogen bubbles on the rollerwall are also facilitated, so that micro pores with uniform hole diameters are prepared; and by virtue of a synergistic effect of bromide ions and polyethylene glycol additive in the second working liquid, the hole diameters can be more uniform, the hole wall quality can be higher, the porosity is lowered, and the conductive performance and mechanical performance of the micropore copper foil are improved.

Description

technical field [0001] The invention belongs to the technical field of devices for directly converting chemical energy into electric energy, and in particular relates to a preparation method of a microporous copper foil for a negative electrode collector of a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in many fields such as electric tools, electric vehicles, aerospace, and large-scale energy storage power systems due to their good cycle life, high operating voltage, and less pollution. The research on lithium batteries continues to deepen, and through the development of new electrode materials, it has higher capacity and better electrochemical cycle performance. In the research, it was found that an excellent negative electrode current collector should not only have good electrical conductivity and mechanical properties, but also uniformly carry the negative electrode active material, which puts forward higher requirements for th...

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 Applications(China)
IPC IPC(8): H01M4/04H01M4/139H01M4/66H01M4/80H01M10/0525C25D1/04C25D3/38
CPCC25D1/04C25D3/38H01M4/0442H01M4/139H01M4/661H01M4/80H01M10/0525Y02E60/10
Inventor 李丽杨祥魁徐树民牛宗伟
Owner SHANDONG JINBAO ELECTRONICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com