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Negative plate, preparation method thereof and lithium ion battery

A lithium-ion battery and negative electrode technology, which is applied in negative electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as complex process steps, expensive equipment investment, and impact on battery performance, achieve uniform porosity, improve transmission capacity, The effect of reducing the possibility of breakage

Inactive Publication Date: 2021-09-21
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above methods of direct secondary cold pressing and secondary cold pressing after treatment have improved the polar performance to a certain extent, but there are still the following problems: the stress in the cold pressing process is not completely released and still continues to affect the subsequent battery performance and Expensive equipment investment and complicated process

Method used

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

[0058] The present embodiment prepares the negative plate according to the following method:

[0059] (1) Mix the binder styrene-butadiene rubber (SBR) and water in a Ross mixer evenly to obtain glue. Weigh a certain amount of negative electrode active components (graphite negative electrode material), dispersant sodium carboxymethyl cellulose (CMC), conductive agent (conductive carbon black), etc., and add them to the glue, and mix them uniformly to obtain a stable negative electrode slurry, in which each The material mass ratio is: negative electrode active component: binder: dispersant: conductive agent is 32:4:1:4, and the solid content of the negative electrode slurry is 51.2%.

[0060] (2) Apply the slurry described in step (1) evenly on the copper foil to ensure that the density on one side of the negative electrode is 90mg / mm 2 , the density of both sides is 180mg / mm 2 , to get the semi-finished negative plate.

[0061] (3) Carry out two cold pressings on the negati...

Embodiment 2

[0071] The difference between this embodiment and embodiment 1 is that in the method for preparing the negative electrode sheet, the value of X in step (3) is 50%, and T is calculated with this 1 value. Other raw materials and operating parameter are identical with embodiment 1.

[0072] The method for preparing the positive electrode sheet and the battery cell of the lithium-ion battery in this embodiment is the same as that in Embodiment 1.

Embodiment 3

[0074] The difference between this embodiment and embodiment 1 is that in the method for preparing the negative electrode sheet, the value of X in step (3) is 30%, and T is calculated with this 1 value. Other raw materials and operating parameter are identical with embodiment 1.

[0075] The method for preparing the positive electrode sheet and the battery cell of the lithium-ion battery in this embodiment is the same as that in Embodiment 1.

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Abstract

The invention provides a negative plate, a preparation method thereof and a lithium ion battery. The method comprises the following steps of carrying out cold pressing on a negative plate semi-finished product twice to obtain the negative plate, wherein the thickness of the negative plate semi-finished product is recorded as T0, the thickness of the product obtained after the two times of cold pressing is recorded as T, the thickness of the product obtained after the first time of cold pressing in the two times of cold pressing is recorded as T1, the degree of the first time of cold pressing is X, and T1=(1-X)T0+T*X, and the negative plate semi-finished product is a dried negative electrode current collector coated with negative electrode slurry. According to the preparation method of the negative plate provided by the invention, a cold pressing method is improved, so that the porosity uniformity of the battery pole plate can be effectively improved, the possibility that active substance particles are broken is reduced, and a solution is provided for the cold pressing problem of a thick pole plate in the development process of a high-specific-energy battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a negative electrode sheet, a preparation method thereof and a lithium ion battery. Background technique [0002] Due to its high output voltage, high energy density, high power density, long cycle life, and good environmental friendliness, lithium-ion secondary batteries are widely used in consumer electronics, electronic communications, energy storage grids, and power vehicles. [0003] In recent years, with the continuous development of new energy vehicles, the demand for power performance of lithium-ion batteries has continued to increase, which has put forward higher and higher requirements for the energy density, safety and cycle life of batteries, especially the demanding requirements for high energy density. especially strong. In the research and development of high energy density batteries, the preferred method is to continuously increase the active material content per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/13H01M4/139H01M10/0525H01M10/058
CPCH01M4/0435H01M4/0404H01M4/0471H01M4/13H01M4/139H01M10/058H01M10/0525H01M2004/021H01M2004/027Y02P70/50Y02E60/10
Inventor 吴剑魏成卓杜双龙苑丁丁吕正中刘金成
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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