Preparation method for lithium titanate negative electrode slurry of lithium battery

A technology of negative electrode slurry and lithium titanate, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of uneven dispersion of conductive agents, affecting battery consistency, poor slurry stability, etc., and achieves short preparation time and equipment The effect of low wear and high solid content

Inactive Publication Date: 2015-12-16
田东
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Problems solved by technology

[0008] In order to overcome the problems existing in the prior art, especially for the lithium titanate negative electrode material with a smaller particle size, the original slurry mixing process is used, which is likely to cause particles in the slurry, uneven dispersion of the conductive agent, poor slurry stability, and eventually Affect the consistency of the battery

Method used

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  • Preparation method for lithium titanate negative electrode slurry of lithium battery

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Embodiment 1

[0029] Lithium titanate prepared by anatase titanium dioxide is used as the negative electrode, SP is the conductive agent, according to Li 4 Ti 5 o 12 : SP: CMC: SBR = 94.0: 1.5: 2.0: 2.5 mass ratio, 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 amount 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...

Embodiment 2

[0042] Lithium titanate prepared by rutile titanium dioxide is used as the negative electrode, SP is the conductive agent, according to Li 4 Ti 5 o 12 : SP: CMC: SBR = 94.5: 2.0: 1.6: 1.9 mass ratio, solvent deionized water is 80% of the total amount 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 between 25 and 35°C;

...

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Abstract

The invention provides a preparation method for lithium titanate negative electrode slurry of a lithium battery. Through steps of preparing a thickening agent solution, dispersing powder, high viscosity stirring, low viscosity stirring, viscosity testing, vacuum defoaming and the like, components of the slurry are uniformly dispersed within a short time; the prepared slurry is high in uniformity and excellent in stability; and meanwhile, the adhesive power of the prepared battery pole piece is improved, and the consistency and the electrochemical performance of the battery are improved consequently. The preparation method has the advantages of short preparation time, low abrasion on equipment, low production energy consumption, good dispersion effect and the like. The lithium battery prepared from the lithium titanate negative electrode slurry prepared by the preparation method is low in internal resistance, low in possibility of generating heat, high in energy density, good in cycling performance, and long in service life.

Description

technical field [0001] This patent relates to the field of lithium ion batteries, specifically a preparation process and method of a lithium titanate 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] Carbon materials have been widely used in lithium-ion batteries due to their cheapness, non-toxicity and superior electrochemical performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391
CPCH01M4/1391Y02E60/10
Inventor 田东
Owner 田东
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