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Method for preparing negative pole slurry for lithium ion batteries

A lithium-ion battery and negative electrode slurry technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems that affect the widespread production and popularization of lithium-ion batteries, increase the production cost of negative electrode slurry, and poor slurry uniformity and stability. , to achieve the effect of improving market application prospects, significant production practice significance, and ensuring uniformity and stability

Inactive Publication Date: 2013-03-20
TIANJIN LISHEN BATTERY
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Problems solved by technology

[0004] However, the uniformity and stability of the slurry prepared by the existing preparation method of lithium ion battery negative electrode slurry are poor, the required time is long, and a large amount of energy needs to be consumed at the same time, the production efficiency is low, and the negative electrode slurry is greatly increased. The production cost of lithium-ion batteries has affected the widespread production and popularization of lithium-ion batteries

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  • Method for preparing negative pole slurry for lithium ion batteries

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preparation example Construction

[0028] see figure 1 , the invention provides a kind of preparation method of negative electrode slurry of lithium ion battery, comprises the following steps:

[0029] The first step: Stir the conductive agent, dispersant and solvent with a mass ratio of 1:3:23 at a constant speed, and fully dissolve to form a mixture;

[0030] Second step: put binder solution in the mixture, the mass ratio between the mixture and binder solution is 7: 8 and then stir;

[0031] The third step: continue to put negative electrode active material in the mixture, the mass ratio between the mixture and the negative electrode active material is 2: 3, then stir;

[0032] The fourth step: continue to put solvent in the mixture, the mass ratio between the mixture and the solvent is 6.5:1, and then stir evenly;

[0033] Step 5: placing the mixture in a vacuum environment to finally prepare a uniform negative electrode slurry.

[0034] In the present invention, in the first step, the conductive agent i...

Embodiment 1

[0046] Mix PVDF (as a binder) and NMP (as a solvent) with a mass ratio of 12:88 and stir at a high speed of 200 to 600 rpm for 4 hours to form a uniform and transparent binder liquid, and then set aside for 4- 8 hours standby;

[0047] Next, mix the conductive agent, dispersant and NMP solvent with a mass ratio of 1: 3: 23, and stir at a low speed of 20 to 40 rpm for at least 60 min;

[0048] Then add the initially prepared binder liquid to the above mixture, first stir at a low speed of 20-40 rpm for 30 minutes by using a mixer, and then stir at a high speed of 2500-3000 rpm for 30 minutes;

[0049] Then, continue to add the artificial graphite as the negative electrode active material into the above-mentioned mixture, the mass ratio between the mixture and the negative electrode active material is 2: 3, stir at a low speed of 20~40 rpm for 15min, then stir at 2500~ Stir at a high speed of 3000 rpm for 60 minutes;

[0050]Then, add N-methylpyrrolidone solvent to the mixture...

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Abstract

The invention discloses a method for preparing negative pole slurry for lithium ion batteries, which comprises the following steps of: 1, stirring a conductive agent, a dispersing agent and a solvent at a constant speed, so that a mixture is formed after the conductive agent, the dispersing agent and the solvent are completely dissolved; 2, adding a binder solution into the mixture, and then stirring the obtained object; 3, continuing to add a negative active material into the mixture, and then stirring the obtained object; 4, continuing to add a solvent into the mixture, and then uniformly stirring the obtained object; and 5, placing the mixture in a vacuum environment so as to finally obtain uniform negative pole slurry. According to the method for preparing negative pole slurry for lithium ion batteries, disclosed by the invention, the working efficiency of preparing the negative pole slurry for lithium ion batteries can be obviously improved, and the uniformity and stability of the negative pole slurry can be guaranteed; and meanwhile, the reduction of the production cost is facilitated, and the performance of lithium ion batteries is improved finally, therefore, the method is suitable for large-scale production applications and facilitates the improvement of the market application prospects of products of battery manufacturers.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a preparation method of a lithium ion battery negative electrode slurry. Background technique [0002] As a new energy source with high voltage, high specific energy, long cycle life, environmental protection and pollution-free, lithium-ion battery is widely used in portable electronic devices, electric vehicles, and energy storage devices. With the increasing share of lithium-ion batteries in the new energy market, there are more and more researchers in lithium-ion battery technology, and the requirements for the performance and safety of lithium-ion batteries are also getting higher and higher. Among them, the uniformity and stability of the electrode slurry have a great influence on the performance of lithium-ion batteries. [0003] For lithium-ion batteries, it is mainly composed of positive electrode, negative electrode and separator. The negative electrode includes cop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/62
CPCY02E60/122Y02E60/10
Inventor 秦红莲高飞张娜
Owner TIANJIN LISHEN BATTERY
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