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Pole piece preparation method, pole piece and lithium ion battery

A technology of pole piece and negative pole piece, which is applied in the field of lithium-ion batteries, can solve the problems of increased pole piece thickness and thick edge of pole piece, and achieve the effect of increasing surface energy

Pending Publication Date: 2021-03-26
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the objectives of the present invention is to provide a lithium-ion battery pole piece for the deficiencies of the prior art, which can solve the problem of thick edges of the pole piece, and can also solve the problem of active material slurry and The problem of increasing the thickness of the pole piece due to the overlapping and blending of insulating paste

Method used

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  • Pole piece preparation method, pole piece and lithium ion battery
  • Pole piece preparation method, pole piece and lithium ion battery
  • Pole piece preparation method, pole piece and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 As shown, the present embodiment provides a method for preparing pole pieces, including the following operations:

[0036] (1) Wipe the entire surface of the current collector 1 foil with a dust-free paper or a dust-free cloth dipped in 90% ethanol solution to increase the surface energy;

[0037] (2) The active material layer coating area 11 and the inactive material layer coating area 12 are preset to the current collector 1, and the inactive material layer coating area 12 is arranged on at least one side of the active material layer coating area 11, and the The active material slurry is coated on the surface of the active material layer coating area 11 to obtain the active material layer 2, wherein the current collector 1 is an aluminum foil, and the active material layer 2 is a positive electrode active material layer.

[0038] (3) After die-cutting, the tab 4 is welded to the inactive material layer coating area 12 on the head of the current colle...

Embodiment 2

[0041] Such as Figure 2~3 As shown, the present embodiment provides a method for preparing pole pieces, including the following operations:

[0042] (1) Wipe the entire surface of the current collector 1 foil with a dust-free paper or a dust-free cloth dipped in 90% ethanol solution to increase the surface energy. After cleaning, the dyne value of the foil is between 31 and 32 dyne / cm;

[0043] (2) if figure 2 As shown, the current collector 1 is preset with an active material layer coating area 11 and an inactive material layer coating area 12, and the inactive material layer coating area 12 is arranged on both sides of the active material layer coating area 11, and the active The material slurry is coated on the surface of the active material layer coating area 11 to obtain the active material layer 2; wherein, the current collector 1 is an aluminum foil, and the active material layer 2 is a positive electrode active material layer;

[0044] (3) Insulating slurry is coat...

Embodiment 3

[0047] Such as Figure 4 As shown, the present embodiment provides a method for preparing pole pieces, including the following operations:

[0048] (1) The active material layer coating area 11 and the inactive material layer coating area 12 are preset for the current collector 1, and the first active material layer coating area 111 and the second active material layer coating area 111 which are adjacently arranged are preset for the active material layer coating area 11. Two active material layer coating areas 112, the first inactive material layer coating area 121 and the second inactive material layer coating area 122 preset adjacent to the inactive material layer coating area 12, the second active material layer The coating area 112 is adjacent to the first inactive material layer coating area 121, and the second active material layer coating area 112 and the first inactive material layer coating area 112 are wiped clean with a dust-free paper or a dust-free cloth dipped i...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a pole piece preparation method, which comprises the following steps of cleaning a current collectorto increase surface energy, presetting an active substance layer coating area and an inactive substance layer coating area for the current collector, arranging the inactive substance layer coating area on at least one side edge of the active substance layer coating area, coating active substance slurry on the surface of the active substance layer coating area to obtain an active substance layer, and conducting die cutting to obtain the pole piece. The surface of the current collector is firstly cleaned to increase the surface energy of the current collector, so that the current collector can be closer to the intrinsic surface state, the attraction of the cleaned current collector to the edge active substance slurry is increased, the edge active substance slurry is prevented from shrinkingtowards the middle, the thick edge phenomenon of the pole piece is avoided, and rolling and bulging can be further avoided; the production efficiency is improved, and the reject ratio of products is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a pole piece, a pole piece and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of light weight and good safety performance, so they have been in a monopoly position in the application of mobile electronic devices such as Bluetooth headsets, mobile phones, notebook computers, tablet computers, cameras, and portable mobile power supplies. At the same time, lithium-ion batteries have also been applied in batches in electric motorcycles, electric vehicles and other fields. [0003] Existing lithium-ion batteries are generally single-tab lithium-ion batteries, that is, each pole piece has only one tab arranged in the empty foil area of ​​the head. In the coating process of this kind of battery with a single tab structure, after the active material layer is coated on both sides of the curr...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/04H01M4/13H01M10/0525
CPCH01M4/139H01M4/0404H01M4/13H01M10/0525Y02E60/10
Inventor 郭江涛王玉虎李晓玲夏小勇张燕萍熊文佳
Owner 东莞维科电池有限公司