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Lithium ion battery pole piece processing method

A lithium ion battery and a processing method technology are applied in the field of lithium ion battery pole piece processing for improving the wettability and liquid absorption of the lithium ion battery pole piece, and can solve the problems of poor wettability and liquid absorption of the battery pole piece, and achieve good performance, improve liquid absorption performance, improve the effect of adhesion

Inactive Publication Date: 2012-09-26
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium-ion battery electrode that can improve the wettability and liquid absorption of the lithium-ion battery pole piece under the premise of ensuring that the lithium-ion battery has a high energy density. Sheet processing method, thereby reducing production costs, ensuring battery performance and reducing appearance of defective products, to overcome the shortcomings of poor wettability and liquid absorption of battery pole pieces in the prior art

Method used

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  • Lithium ion battery pole piece processing method
  • Lithium ion battery pole piece processing method
  • Lithium ion battery pole piece processing method

Examples

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Effect test

Embodiment 1

[0021] Embodiment 1: the cold-pressed cathode pole piece is placed in such as figure 1 On the guide roller 1 of the shown device, two corona treatment machines 2 are respectively located directly above and directly below the cathode sheet. The cathode pole piece passes through the corona treatment machine 2 under the traction of the guide roller 1, and the two surfaces of the cathode pole piece are applied with high-voltage alternating frequency voltage, which generates a large amount of low-temperature plasma to bombard the surface of the material and enter the molecular structure of the material, making the material The surface molecules are polarized, thereby increasing the surface energy of the pole piece. At the same time, it promotes the breakage of chemical bonds, resulting in more hydrophilic atomic groups or functional groups such as hydroxyl groups, carbon groups, and hydrogen peroxide bonds, so as to improve the wettability of the electrolyte to the pole piece and i...

Embodiment 2

[0023] Embodiment 2: place the cathode pole piece after cutting on such as figure 2 On the guide roller 1 of the shown device, the corona treatment machine 2 is located directly above the cathode electrode sheet. The cathode pole piece passes through the corona treatment machine 2 under the traction of the guide roller 1, and the surface of the cathode pole piece close to the corona treatment machine 2 is applied with high-voltage alternating frequency voltage to generate a large amount of low-temperature plasma bombarding the surface of the material and entering the molecular structure of the material , to polarize the surface molecules of the material, thereby increasing the surface energy of the pole piece. At the same time, it promotes the breakage of chemical bonds, resulting in more hydrophilic atomic groups or functional groups such as hydroxyl groups, carbon groups, and hydrogen peroxide bonds, so as to improve the wettability of the electrolyte to the pole piece and ...

Embodiment 3

[0025] Embodiment 3: The cathode pole piece that is welded with lug is placed on such as figure 1 On the guide roller 1 of the shown device, the corona treatment machine 2 is respectively located directly above and directly below the cathode sheet. The cathode pole piece passes through the corona treatment machine 2 under the traction of the guide roller 1, and the two surfaces of the cathode pole piece are applied with high-voltage alternating frequency voltage, which generates a large amount of low-temperature plasma to bombard the surface of the material and enter the molecular structure of the material, making the material The surface molecules are polarized, thereby increasing the surface energy of the pole piece. At the same time, it promotes the breakage of chemical bonds, resulting in more hydrophilic atomic groups or functional groups such as hydroxyl groups, carbon groups, and hydrogen peroxide bonds, so as to improve the wettability of the electrolyte to the pole pi...

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to a lithium ion battery pole piece processing method. A pole piece comprises a current collector and a membrane arranged on the surface of the current collector, and the pole piece is subjected to corona treatment after cold-pressing process of the pole piece and before reeling or laminating process of a battery cell. Compared with the prior art, as the single sides or both sides of both a cathodal pole piece and an anodal pole piece are subjected to corona treatment, the surface energy of the pole pieces can be increased, generation of a hydrophilic atom set or functional group on the surfaces of the pole pieces is promoted, and accordingly, the purposes of improving the wettability of an electrolyte to the pole pieces and improving the imbibition performance of the battery cell are achieved. Therefore, the stewing time after liquid charging and before formation is shortened, the production period of a battery is shortened, and the manufacturing cost is lowered eventually; a stable solid electrolyte interphase (SEI) interface can be formed in the formation procedure, so that the performance of the battery cell is ensured; and the liquid rise of the battery cell is reduced, products with damaged appearance are reduced and the product acceptance rate is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery pole piece treatment method capable of improving the wettability and liquid absorption of the lithium-ion battery pole piece. Background technique [0002] With the development of modern society, mobile devices such as camcorders, notebook computers, portable DVDs and digital cameras have become more and more widely used. As the energy supply components of these mobile devices, lithium-ion batteries have also been greatly developed. In recent years, with the increasingly prominent characteristics of small and exquisite mobile devices, it has put forward higher and higher requirements for the energy density of lithium-ion batteries. [0003] In order to achieve the purpose of increasing the energy density of the lithium-ion battery, the prior art generally achieves this by increasing the compaction density of the anode pole piece and...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/139
CPCY02E60/122Y02E60/10
Inventor 何平方宏新张柏清路超
Owner DONGGUAN AMPEREX TECH
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