Stirring method for negative electrode of lithium ion batteries, application of stirring method, and lithium ion battery

A lithium-ion battery and stirring method technology, which is applied to mixing methods, mixer accessories, chemical instruments and methods, etc., can solve problems such as poor stirring uniformity, and achieve the effects of overcoming poor uniformity, improving battery cycle performance, and improving uniformity.

Inactive Publication Date: 2018-01-23
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to, in view of the above defects, provide a lithium ion battery negative electrode stirring method, application and lithium ion battery, to solve the problem of poor stirring uniformity of lithium ion battery negative electrode slurry in the prior art, to achieve improved stirring uniformity Effect

Method used

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  • Stirring method for negative electrode of lithium ion batteries, application of stirring method, and lithium ion battery
  • Stirring method for negative electrode of lithium ion batteries, application of stirring method, and lithium ion battery
  • Stirring method for negative electrode of lithium ion batteries, application of stirring method, and lithium ion battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] The lithium-ion battery negative electrode stirring method of the present embodiment may include:

[0035] Step 1: According to the set lithium-ion battery negative electrode formula, based on the amount of each component set, the conductive agent is added to the solvent for pre-stirring (for example: the conductive agent is added to deionized water for pre-stirring ), while pre-stirring the dispersant.

[0036] For example: while the conductive agent and the solvent are pre-stirred, the dispersant is pre-stirred.

[0037] In an optional example, in the step 1, adding the conductive agent to the solvent for pre-stirring may include: first stirring at a speed of 10 rpm and / or rotating at a speed of 100 rpm until After the dry powder of the conductive agent is completely soaked in the solvent, it is scraped; after the scraping is completed, it is rotated at a speed of 20 rpm and / or rotated at a speed of 1000 rpm, and stirred for 60 minutes. By first stirring at a low spee...

Embodiment 2

[0079] Different from the above-mentioned embodiments, the lithium-ion battery negative electrode stirring method of this embodiment may include:

[0080] In step 1, adding the conductive agent into the solvent for pre-stirring may include: first stirring at a speed of 30 rpm and / or rotating at a speed of 500 rpm until the dry powder of the conductive agent is completely soaked in the After being immersed in the solvent, scraping is carried out; after the scraping is completed, it is stirred for 90 minutes by revolving at a speed of 50 rpm and / or rotating at a speed of 2500 rpm.

[0081] Optionally, when adding the conductive agent into the solvent for pre-stirring, and stirring at a speed of 30 rpm and / or rotating at a speed of 500 rpm, the stirring time is 30 min.

[0082] In an alternative example, when the conductive agent is added into the solvent for pre-stirring, when the stirring is carried out for 90 minutes, a vacuum setting is performed so that it is in a vacuum sta...

Embodiment 3

[0093] Different from the above-mentioned embodiments, the lithium-ion battery negative electrode stirring method of this embodiment may include:

[0094] In step 1, adding the conductive agent to the solvent for pre-stirring may include: first stirring at a speed of 20 rpm and / or rotating at a speed of 300 rpm until the dry powder of the conductive agent is completely After immersing in the solvent, scraping is performed; after the scraping is completed, it is rotated at a speed of 35 rpm and / or rotated at a speed of 1750 rpm, and stirred for 75 minutes.

[0095] Optionally, when adding the conductive agent into the solvent for pre-stirring, and stirring at a revolution speed of 20 rpm and / or autorotation at a speed of 300 rpm, the stirring time is 20 min.

[0096] In an alternative example, when the conductive agent is added into the solvent for pre-stirring, when the stirring is carried out for 75 minutes, a vacuum setting is performed so that the following steps 2 to 6 are...

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Abstract

The invention discloses a stirring method for the negative electrode of lithium ion batteries, application of the stirring method, and a lithium ion battery. The method includes: pre-stirring a conductive agent in a solvent, and pre-stirring a dispersing agent; adding the dispersing agent with the mass percentage being 50-60% and a negative electrode active material with the mass percentage being50-70% into the conductive agent obtained after the pre-stirring, and performing first-step stirring; adding the negative electrode active material with the mass percentage being 30-50%, and performing second-step stirring; adding the dispersing agent with the mass percentage being 40-50%, and performing third-step stirring; adding binder to perform fourth-step stirring; defoaming, and dischargingafter the defoaming. By the stirring method, the defects such as poor evenness, poor circulating performance and low reliability in the prior art can be overcome, and good evenness, good circulatingperformance and high reliability can be achieved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium ion battery negative electrode stirring method, application and the lithium ion battery. Background technique [0002] Lithium-ion battery is a secondary battery (that is, a rechargeable battery). It generally uses materials containing lithium elements as electrodes. It mainly relies on lithium ions (Li+) to move between the positive and negative electrodes to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: when charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Cell phones and laptops use lithium-ion batteries. [0003] Lithium-ion battery is composed of positive electrode, negative electrode, diaphragm, an...

Claims

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Application Information

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IPC IPC(8): B01F3/12B01F15/00H01M10/058
CPCY02E60/10Y02P70/50
Inventor 段科蒋世用李乾乾钟宽王晋吉纯王文华
Owner GREE ELECTRIC APPLIANCES INC
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