Preparation method for lithium cobalt oxide cathode slurry

A technology of positive electrode slurry and lithium cobalt oxide, which is applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of lithium battery performance impact, long-term treatment of conductive agents, equipment requirements and high wear, and achieve short preparation time , less equipment wear and lower production energy consumption

Inactive Publication Date: 2015-11-11
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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  • Preparation method for lithium cobalt oxide cathode slurry

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Effect test

Embodiment 1

[0026] With SP as the conductive agent and PVDF as the binder, according to LiCoO 2 :SP:PVDF=95.7:2.3:2.0 mass ratio, the solvent NMP is 65% of the total amount of the above components. The preparation steps are as follows:

[0027] 1. Put each component into the mixing tank to stir and disperse for 40 minutes, and scrape the powder on the mixing paddle and the barrel at the time of 20 minutes and 40 minutes;

[0028] 2. Add 55% of the total amount of NMP to the above stirred powder, stir and disperse for 70 minutes, and scrape the slurry on the stirring blade and the barrel at the time of 20 minutes, 40 minutes and 60 minutes, The slurry temperature is controlled between 25 and 35°C;

[0029] 3. Add 35% of the total amount of solvent to the above-mentioned high-viscosity stirred slurry, stir and disperse for 60 minutes, and scrape the slurry on the stirring blade and the barrel at the time of 23 minutes, 46 minutes and 70 minutes Material, the temperature of the slurry is ...

Embodiment 2

[0037] With SP and KS-6 as conductive agent, PVDF as binder, according to LiCoO 2 : SP: KS-6: PVDF = 93: 2.2: 1.3: 3.5 mass ratio, solvent NMP is 90% of the total amount of the above components. The preparation steps are as follows:

[0038] 1. Add each component into the mixing tank to stir and disperse for 30 minutes, and scrape the powder on the mixing paddle and the barrel at the time of 15 minutes and 30 minutes;

[0039] 2. Add 60% of the total amount of NMP to the above-mentioned stirred powder, stir and disperse for 60 minutes, and scrape the slurry on the stirring blade and the barrel at the time of 20 minutes, 40 minutes and 60 minutes, The slurry temperature is controlled between 25 and 35°C;

[0040] 3. Add 30% of the total amount of solvent to the above-mentioned high-viscosity stirred slurry, stir and disperse for 60 minutes, and scrape the slurry on the stirring blade and the barrel at the time of 20 minutes, 40 minutes and 60 minutes Material, the temperatur...

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Abstract

The invention provides a preparation method for lithium cobalt oxide cathode slurry. By the steps of powder dispersion, high-viscosity stirring, low-viscosity stirring, viscosity test, vacuum defoaming and the like, all constituents of the slurry are uniformly dispersed in a short time, the prepared slurry is good in uniformity and excellent in stability, meanwhile, the adhesive of a battery pole piece prepared according to the method is enhanced, and thus, the consistency of a battery and the electrochemical performance of the battery are improved. The preparation method has the advantages of short preparation time, low equipment abrasion, low energy consumption in production, good dispersion and the like. A lithium battery prepared from the lithium cobalt oxide cathode slurry provided by the invention has the advantages of low inner resistance, difficulty in heat generation, high energy density, high cycle performance and long service life.

Description

technical field [0001] This patent relates to the field of lithium-ion batteries, specifically a preparation process and method for a lithium cobalt oxide cathode 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 elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391
CPCH01M4/1391H01M4/62Y02E60/10
Inventor 田东
Owner 田东
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