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

Method for improving adhesion property of aluminum foil for anode of lithium ion battery

A lithium-ion battery, a technology of bonding performance, applied to the device for coating liquid on the surface, pre-treating the surface, coating, etc., can solve the problem of improving the performance of the positive electrode binder, reducing the binder content, and sticking Poor performance and other problems, to achieve the effect of improving bondability, improving bonding performance, and reducing the amount of adhesive

Inactive Publication Date: 2012-01-25
HUNAN FENGYUAN YESHINE KINGCO NEW ENERGY
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is well known in the industry that in order to increase the capacity of lithium-ion batteries, the positive active material is the key. The more positive active material coated on the aluminum foil, the higher the energy, but there is a problem at the same time. When the thickness of the active material is constant, increasing the content of the active material will inevitably lead to a relative decrease in the content of the binder, and then reduce the binding performance; It will be greatly reduced, and the batteries made in severe cases will become waste products
[0003] At present, in the lithium-ion battery industry, the production of the positive electrode is to ensure the bonding performance first, but the effect is not ideal, and it is often necessary to add more binders, especially as the particle size of the positive electrode active material becomes smaller and smaller. Under the premise of ensuring the amount of active material, it is becoming more and more difficult to improve the performance of the positive electrode binder

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
  • Method for improving adhesion property of aluminum foil for anode of lithium ion battery
  • Method for improving adhesion property of aluminum foil for anode of lithium ion battery
  • Method for improving adhesion property of aluminum foil for anode of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 2 samples of aluminum foil for lithium-ion batteries, one of which is not treated with plasma, and is marked as sample 1; the other is treated with plasma, the plasma power is 0.6KW, and the distance between the nozzle of the plasma spray gun and the aluminum foil is 5mm. The speed of the aluminum foil is 20m / min, which is marked as sample 2. Use the surface tension energy test ink (60mN / m) to test the surface energy of sample 1 and sample 2 respectively, see the effect photos for details figure 1 , 2 .

[0016] From the above experimental results, it can be seen that after plasma treatment, the surface properties of the aluminum foil have been greatly improved, and the adhesiveness has been significantly improved.

Embodiment 2

[0018] Lithium cobalt oxide (LiCoO 2 ) as a positive electrode active material, conductive carbon black (SP) as a conductive agent, and polyvinylidene fluoride (PVDF) as a binder, the ratio of which is 96.2:1.9:1.9, mixed and prepared into a positive electrode active material slurry with a viscosity of 5800cP, Then be coated on the aluminum foil of untreated comparative example 2 and normal pressure plasma treatment embodiment 2 respectively, wherein the adjustment experiment is carried out in different processes during plasma treatment, the plasma power is 0.8KW, and the plasma spray gun is installed before the coating machine head, The length of the aluminum foil between the spray gun and the two points of the machine head is about 3m. The distance between the nozzle of the spray gun and the aluminum foil is adjusted to 2mm, 5mm, 8mm, 10mm, and 12mm respectively. The speed of the aluminum foil is 10m / min. Then make the positive electrode. The peeling performance of the posi...

Embodiment 3

[0023] Nano lithium iron phosphate (LiFePO 4 ) as the positive electrode active material, conductive carbon black (SP) and carbon nanotubes (CNT) as the conductive agent, polyvinylidene fluoride (PVDF) as the binder, the ratio is 93.5:1.5:1.5:3.5, mixed to form a viscosity Be the positive electrode active material slurry of 4200cP, then be respectively coated on the aluminum foil of the embodiment 3 of the comparative example 3 that is not processed and normal pressure plasma treatment, wherein plasma treatment is divided into different processes to carry out the adjustment experiment, and the plasma spray gun is installed on the coating machine In front of the head, the plasma power is 1KW, the length of the aluminum foil between the spray gun and the machine head is about 3m, the distance between the nozzle of the spray gun and the aluminum foil is adjusted to 4mm, and the speed of the aluminum foil is adjusted to 6m / min, 9m / min, 12m / min, 15m / min, coated immediately after t...

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 provides a method for improving adhesion property of an aluminum foil for an anode of a lithium ion battery. The method comprises the following steps: carrying out atmospheric pressure plasma treatment on the surface of the aluminum foil for the lithium ion battery before the anode of the lithium ion battery enters a coating machine, wherein technological parameters for plasma treatment are as follows: the plasma power is 0.6-1KW, the distance between the spray nozzle of a plasma spray gun and the surface of the aluminum foil is 2-15mm, and the tape-traveling speed of the coating machine is 6-15m / min; and coating the aluminum foil within 60 minutes after plasma treatment. The method is simple and convenient in operation and has the advantages of effectively improving the adhesion property between active substances and a substrate for the anode of the lithium ion battery, increasing the capacity of the lithium ion battery, ensuring the excellent adhesion property of the anode of the lithium ion battery on the premise of lowering the consumption of a bonding agent, and preventing environmental pollution, thus achieving the purpose of environmental conservation and being suitable for industrial application.

Description

technical field [0001] The invention relates to a method for modifying an aluminum foil for a positive electrode of a lithium ion battery, in particular to a method for improving the bonding performance of an aluminum foil for a positive electrode of a lithium ion battery. It belongs to the technical field of chemical power supply preparation. Background technique [0002] Lithium-ion batteries have developed rapidly in recent years because of their advantages such as high specific energy and no memory effect. Lithium-ion batteries are mainly composed of positive electrode, negative electrode, separator and electrolyte. For the positive electrode, the current relatively mature method is to use aluminum foil as the current collector, and then make the positive electrode active material into a slurry and coat it on the aluminum foil. The positive electrode is made after drying. The slurry needs to be coated on the aluminum foil, which requires the slurry to have good bonding...

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): B05D3/00
Inventor 金旭东罗朝晖何伟唐联兴蒋金花徐州杨飞郝鹏卢宇驰
Owner HUNAN FENGYUAN YESHINE KINGCO NEW ENERGY
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