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Cathode slurry and preparation method thereof, cathode of lithium ion battery and lithium ion battery

A lithium-ion battery and negative electrode slurry technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electrolyte resistance, large swelling degree, and unstable system of binders, and achieve enhanced electrolysis resistance Liquid performance, improve bond strength, improve the effect of cycle performance

Inactive Publication Date: 2014-12-10
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing pulping process usually mixes the emulsion binder and the negative electrode active material with the solvent to obtain the negative electrode slurry. The negative electrode slurry prepared by this method has different properties and complex interactions between different substances, so The binder in the prepared negative electrode slurry is poorly dispersed in the slurry, and the system is unstable, thereby affecting the bonding of the active material of the pole piece; and the binder has poor electrolyte resistance, and its swelling degree in the electrolyte Larger, which indirectly causes the decline of the negative electrode in the cycle, and ultimately affects the cycle performance of the battery
[0004] There are also many researchers who try to coat a layer of metal oxide on the negative electrode after the negative electrode is prepared to improve the performance of the negative electrode, but this cannot fundamentally solve the problem of the dispersion of the binder in the slurry. The poor effect causes the negative electrode to have defects such as easy decay. Therefore, it is necessary to seek a method that can make the binder in the prepared slurry have a good dispersion effect in the slurry, and the binder has good electrolysis resistance in the battery. The preparation method of negative electrode slurry is particularly urgent

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  • Cathode slurry and preparation method thereof, cathode of lithium ion battery and lithium ion battery
  • Cathode slurry and preparation method thereof, cathode of lithium ion battery and lithium ion battery
  • Cathode slurry and preparation method thereof, cathode of lithium ion battery and lithium ion battery

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preparation example Construction

[0016] The invention provides a method for preparing negative electrode slurry, wherein, the method comprises mixing an emulsion binder and a metal oxide to form a mixture, and then uniformly mixing the mixture with a negative electrode active material and a solvent.

[0017] According to the present invention, although the purpose of the present invention can be achieved by mixing the emulsion binder and the metal oxide in advance as long as the emulsion binder, the negative electrode active material and the solvent are mixed, in order to realize the binding agent more effectively Dispersion in the slurry, preferably, by weight, the ratio of the emulsion binder and the metal oxide is 100:0.05-0.5, more preferably 100:0.08-0.2; the solid content of the emulsion binder is generally 20- 50% by weight, more preferably 30-45% by weight. In the present invention, the solid content refers to the content of non-volatile matter in the emulsion binder, which is specifically measured by...

Embodiment 1

[0049] This example is used to illustrate the negative electrode slurry and the preparation method thereof of the present invention, the negative electrode of the lithium ion battery and the preparation method of the lithium ion battery thereof.

[0050] 1. Preparation of negative electrode slurry for lithium-ion batteries

[0051] Take by weighing 100g carboxylated nitrile emulsion (XNBRL) (the solvent of emulsion is water) (solid content is 40% by weight) and 0.1g zinc oxide (ZnO) (particle diameter is 60nm), adopt four-bladed paddle stirrer to stir 1h with 300rpm speed A mixture was formed, yielding 100.1 g of the mixture. Then weigh 1.5 kg of graphite, add 22.5 g of carboxymethyl cellulose ether and 1.8 kg of water, and use a four-bladed paddle stirrer to stir at a speed of 500 rpm for 2 hours to obtain a negative electrode slurry, and perform the following performance tests on the obtained negative electrode slurry.

[0052] Performance Testing:

[0053] (1) Test the rh...

Embodiment 2

[0075] This example is used to illustrate the negative electrode slurry and the preparation method thereof of the present invention, the negative electrode of the lithium ion battery and the preparation method of the lithium ion battery thereof.

[0076]Prepare negative electrode slurry, negative electrode, positive electrode and lithium ion battery according to the method for embodiment 1, difference is 100g carboxylated nitrile emulsion (XNBRL) (the solvent of emulsion is water) (solid content is 40% by weight) in step (1) And 0.1g zinc oxide (ZnO) is respectively made of 150g carboxylated styrene-butadiene emulsion (XSBRL) (the solvent of emulsion is water) (solid content is 40% by weight) and 0.08g tin dioxide (SnO 2 ) (particle size is 80nm) instead, and 22.5g carboxymethyl cellulose ether is replaced by 30g methyl cellulose (MC), the water that adds is 1.2kg, makes negative electrode slurry. The rest of the steps are the same.

[0077] Gained negative electrode slurry a...

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Abstract

The invention provides a cathode slurry and a preparation method thereof. The method comprises the steps of mixing an emulsion binder and a metal oxide to obtain a mixture and then uniformly mixing the mixture with a cathode active substance and a solvent. The invention also provides a cathode of a lithium ion battery and the lithium ion battery. According to the preparation method for the cathode slurry, the emulsion binder and the metal oxide are mixed in advance to prepare a mixture before the emulsion binder, the cathode active substance and the solvent are uniformly mixed, and then the obtained mixture is uniformly mixed with the cathode active substance and the solvent; therefore, dispersion and stability of the binder in the prepared slurry are effectively realized, and bonding strength of a negative plate is obviously improved, thereby improving stability of the cathode prepared from the cathode slurry and eventually enhancing cycle performance of the lithium ion battery.

Description

technical field [0001] The invention relates to a negative electrode slurry and a preparation method thereof, a negative electrode of a lithium ion battery prepared by using the negative electrode slurry of the invention, and a lithium ion battery thereof. Background technique [0002] Lithium-ion battery is a small secondary battery widely used at present, which has the advantages of high specific energy, high working voltage, low self-discharge rate, long cycle life, and no pollution. In the lithium battery negative electrode system, the binder (emulsion binder and thickener) is one of the important components, which is crucial to the performance of the slurry, pole piece and battery. [0003] The existing pulping process usually mixes the emulsion binder and the negative electrode active material with the solvent to obtain the negative electrode slurry. The negative electrode slurry prepared by this method has different properties and complex interactions between differen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/131H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 朱江魏岩巍陈珍贞高雪庆
Owner SHANGHAI BYD