Preparation method for negative electrode paste of lithium battery

A negative electrode slurry, lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high equipment requirements and wear, poor stability, long time consumption, etc., to improve production efficiency, high rate discharge, safety high performance effects

Active Publication Date: 2015-12-09
内蒙古斯诺新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method first requires a long time for the dispersion of the conductive agent, which takes a long time and the dispersion state is not ideal, especially for the preparation of the slurry using carbon nanotubes (CNT), graphene, etc. as the conductive agent; secondly, the traditional process requires During the slurry preparation process, the stirring system is kept in a vacuum state, causing

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  • Preparation method for negative electrode paste of lithium battery
  • Preparation method for negative electrode paste of lithium battery
  • Preparation method for negative electrode paste of lithium battery

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Embodiment 1

[0029] Artificial graphite is used as the negative electrode active material, SP is the conductive agent, according to the mass ratio of graphite: SP: CMC: SBR = 94.0: 1.5: 2.0: 2.5, the solvent deionized water is 100% of the total amount of the above components. The preparation steps are as follows:

[0030] 1. Add the thickener CMC into the deionized water solvent, dissolve it evenly with a mixer, take it out for use, and the time is 60 minutes;

[0031] 2. Add the negative electrode active material and conductive agent into the mixing tank to stir and disperse for 30 minutes, and scrape the powder on the stirring blade and the barrel at the time of 15 minutes and 30 minutes;

[0032] 3. Add 55% of the total weight of the thickener solution to the above stirred powder, stir and disperse for 60 minutes, and scrape the stirring blade and the barrel on the time of 20 minutes, 40 minutes and 60 minutes Slurry, the temperature of the slurry is controlled between 25 and 35°C;

...

Embodiment 2

[0042] Natural graphite is used as the negative electrode active material, SP is the conductive agent, according to the mass ratio of graphite: SP: CMC: SBR = 94.5: 2.0: 1.6: 1.9, the solvent deionized water is 80% of the total weight of the above components. The preparation steps are as follows:

[0043] 1. Add the thickener CMC into the deionized water solvent, dissolve it evenly with a mixer, take it out for use, and the time is 120 minutes;

[0044] 2. Add the negative electrode active material and conductive agent into the mixing tank to stir and disperse for 40 minutes, and scrape the powder on the stirring blade and the barrel at the time of 20 minutes and 40 minutes;

[0045] 3. Add 60% of the total amount of thickener solution to the above stirred powder, stir and disperse for 70 minutes, and scrape the stirring blade and the barrel at 23 minutes, 46 minutes and 70 minutes Slurry, the temperature of the slurry is controlled at 25-35°C;

[0046] 4. Add 35% of the tot...

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Abstract

The invention proposes a preparation method for a negative electrode paste of a lithium battery. The preparation method comprises the following steps of: A, adding a thickener into a deionized water solvent, uniformly dissolving the mixture by using an agitating machine, and taking out the mixture for use; B, adding a negative active matter and a conductive agent into an agitating vessel according to a proportion, and agitating and dispersing the mixture; C, adding the thickener solution in an amount of 55-60% of the total quantity into a powder body after agitation, agitating and dispersing the mixture, and controlling the temperature of the paste to be 25-35 DEG C; E, carrying out viscosity test on the viscosity of the paste obtained in the step D, and directly forwarding into the next step if the viscosity is within a normal range of 2,000 to 5,000 Mpa.S; F, adding a binding agent again, and agitating and dispersing the mixture; and G, vacuumizing the vessel at an agitating state, thereby obtaining the prepared negative electrode paste. Compared with the traditional negative electrode paste preparation process, the preparation method has the advantages that the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation process and method of negative electrode material slurry. Background technique [0002] At present, with the shortage of global oil resources and the continuous deterioration of the climate environment, the development of human society is facing severe challenges. The development of clean and energy-saving new energy vehicles is highly valued by countries all over the world. The key to the development of new energy vehicles lies in their power sources. Lithium-ion batteries have the advantages of high energy density, small self-discharge, no memory effect, wide operating voltage range, long service life, and no environmental pollution. They are currently the main power source for new energy vehicles. [0003] A lithium-ion battery generally includes a positive electrode sheet, a negative electrode sheet, and a separator spaced between the positive electrode sh...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/62H01M10/0525
CPCH01M4/587H01M4/625H01M10/0525H01M4/62Y02E60/10
Inventor 鲍海友田东谌江宏鲍丹张贵萍
Owner 内蒙古斯诺新材料科技有限公司
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