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Negative plate, preparation method thereof and lithium ion battery

A technology of negative electrode sheet and negative electrode, which is applied in the field of its preparation, lithium-ion battery, and negative electrode sheet, can solve the problems of ultra-thin current collectors that are easy to wrinkle, avoid the potential risk of battery lithium analysis, improve production efficiency, prevent wrinkling and The effect of staying

Active Publication Date: 2020-03-24
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a negative electrode sheet, its preparation method and lithium-ion battery to solve the problem that the ultra-thin current collector is easy to wrinkle

Method used

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  • Negative plate, preparation method thereof and lithium ion battery
  • Negative plate, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1 provides a negative electrode sheet, and the edge of the negative electrode sheet has high rigidity.

[0037] Please refer to figure 1 , the negative electrode sheet includes a negative electrode current collector 1, the negative electrode current collector 1 is coated with negative electrode slurry to form a negative electrode coating film area 2, at least one side edge of the negative electrode film area 2 is coated with insulating slurry to form an insulating coating film area 3, The insulating coating film region 3 and the negative electrode coating film region 2 are adjacent to or partially soluble in each other.

[0038] The edge of the insulating coating area 3 away from the negative electrode coating area 2 leaves a negative electrode blank area for forming the negative electrode tab 11 , and the insulating coating film area 3 is located at the root of the negative electrode tab 11 .

[0039] In the negative electrode sheet provided by the embodime...

Embodiment 2

[0050] The embodiment of the present invention provides a method for preparing the negative electrode sheet, which is used to prepare the negative electrode sheet described in the first embodiment.

[0051] The preparation method comprises the following steps:

[0052] Coating the negative electrode slurry on the negative electrode current collector 1 to form a negative electrode coating area 2, and coating the insulating slurry on at least one side edge of the negative electrode coating area 2 to form an insulating coating film area 3;

[0053] The negative electrode slurry and the insulating slurry are dried by baking, and after drying, the insulating coating film area 3 and the negative electrode coating film area 2 are adjacent to or partially soluble in each other to obtain a negative electrode sheet;

[0054] Wherein, a negative electrode blank area for forming the negative electrode tab 11 is left on the edge of the side of the insulating coating film region 3 away from...

Embodiment 3

[0064] Embodiment 3 provides a lithium-ion battery and its preparation method. The lithium-ion battery includes the negative electrode sheet described in Embodiment 1 and the negative electrode sheet prepared by the preparation method described in Embodiment 2.

[0065] The lithium-ion battery includes a battery core, and the battery core is filled with electrolyte. The battery core includes a positive electrode sheet, a separator and a negative electrode sheet stacked in sequence.

[0066] The positive electrode sheet includes a positive electrode current collector, and the positive electrode slurry is coated on the positive electrode current collector to form a positive electrode coating film area. The positive electrode current collector is preferably aluminum foil.

[0067] The positive electrode slurry includes the following components in parts by mass: 96 parts of positive electrode material, 3 parts of positive electrode conductive agent, 1 part of third binder and 30 ...

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Abstract

The invention discloses a negative plate, a preparation method thereof and a lithium ion battery. The negative plate comprises a negative current collector. The negative current collector is coated with negative slurry to form a negative film coating area. At least one side edge of the negative film coating area is coated with insulating slurry to form an insulating film coating area, and the insulating film coating area and the negative film coating area are adjacent or partially miscible. A negative electrode blank area for forming a negative electrode lug is reserved on the edge of one side, far away from the negative electrode coating area, of the insulating coating area. The insulating coating area is positioned at the root of the negative electrode lug. According to the invention, the insulating coating area is additionally arranged on the edge of the cathode coating area, the foil leakage or thick edge bulging of the edge of the negative plate can be prevented. Moreover, the rigidity of the root part of the negative tab can be enhanced, the negative electrode lug is prevented from wrinkling and collapsing, the potential lithium precipitation risk of the battery due to the fact that the negative electrode lug is folded and inversely inserted into the battery cell to be covered with a negative material is avoided, the operability of the process is improved during electrodelug forming, winding or lamination assembly, the defects are reduced, and the production yield and the production efficiency are improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a negative electrode sheet, a preparation method thereof and a lithium ion battery. Background technique [0002] Due to the advantages of high voltage, high energy density, high cycle life, low self-discharge rate, light weight and no memory effect, lithium-ion batteries have achieved a wide range of applications in various fields. With the continuous improvement of the capacity requirements of lithium-ion batteries for electrical equipment, people's expectations for the energy density of lithium-ion batteries are getting higher and higher. In addition to traditional digital products, energy storage devices, electric tools and electric vehicles are also constantly developing lithium-ion batteries with lighter weight, smaller volume, higher output voltage and power density, and the development of lithium-ion batteries with high energy density It is an important research and development ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525H01M2004/027Y02E60/10
Inventor 刘娇江柯成张浩张传健邓云华郭玉国朱金保
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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