Method for preparing lithium battery graphite cathode slurry

A graphite anode and lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of the performance impact of the pole piece lithium battery, the long-term treatment of conductive agents, equipment requirements and high wear and tear, and achieve short preparation time, The effect of less equipment wear and lower production energy consumption

Inactive Publication Date: 2015-11-18
田东
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AI Technical Summary

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 the internal temperature of the slurry system to rise easily, and at the same time, circulating water is added to the outside for cooling, so the requirements and wear on the equipment are very high
The above results in low slurry preparation efficiency, poor stability, and unsatisfactory effects, which will affect the preparation of subsequent pole pieces and the performance of lithium batteries.

Method used

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  • Method for preparing lithium battery graphite cathode slurry

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Experimental program
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Effect test

Embodiment 1

[0027] 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:

[0028] 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;

[0029] 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;

[0030] 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 25 and 35°C;

...

Embodiment 2

[0040] 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 amount of the above components. The preparation steps are as follows:

[0041] 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;

[0042]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;

[0043] 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;

[0044] 4. Add 35% of...

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Abstract

The invention provides a method for preparing lithium battery graphite cathode slurry. The steps of thickener solution preparing, powder dispersing, high-viscosity stirring, low-viscosity stirring, viscosity testing, vacuum defoaming and the like are conducted so that all the components of the slurry can be evenly dispersed within short time, uniformity of the prepared slurry is good, stability is excellent, the adhesive force of a battery pole piece prepared from the slurry is improved, and the consistency and the electrochemical performance of a battery are improved. The method has the advantages that the preparing time is short, equipment abrasion is little, energy consumption of production is low, and the dispersing effect is good. The lithium battery prepared through the lithium battery graphite cathode slurry is low in internal resistance, not prone to heating, high in energy density, good in circulation 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 graphite 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/583H01M10/0525Y02E60/10
Inventor 田东
Owner 田东
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