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

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...

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

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