Preparation method for lithium iron phosphate cathode slurry

A technology of lithium iron phosphate and cathode slurry, which is applied in battery electrodes, electrical components, circuits, etc., can solve the problems of performance impact of pole piece lithium batteries, long-term treatment of conductive agents, equipment requirements and high wear and tear, and achieves short preparation time. , The effect of small equipment wear and low production energy consumption

Inactive Publication Date: 2015-12-16
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 iron phosphate cathode slurry

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Experimental program
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Effect test

Embodiment 1

[0026] Use SP as conductive agent, PVDF as binder, according to LiFePO 4 : SP:PVDF=95.7:2.3:2.0 mass ratio, solvent NMP is 100% of the total amount of each component. The preparation steps are as follows:

[0027] 1. Add the components to the mixing tank and stir and disperse for 40 minutes, and scrape the powder on the mixing paddle and the tank at the time of 20 minutes and 40 minutes;

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

[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 paddle and the barrel at the time of 23 minutes, 46 minutes and 70 minutes. The temperature of material and slurry is controlled betwe...

Embodiment 2

[0037] Use SP and KS-6 as conductive agent, PVDF as binder, according to LiFePO 4 : SP:KS-6:PVDF=93:2.2:1.3:3.5 mass ratio, solvent NMP is 120% of the total amount of the above components. The preparation steps are as follows:

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

[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 paddle and the barrel at the time of 20 minutes, 40 minutes and 60 minutes. The temperature of the slurry is controlled between 25~35℃;

[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 paddle and the barrel at the time of 20 minutes, 40 minutes and 60 minutes The temperature of material and slurry...

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Abstract

The invention provides a preparation method for lithium iron phosphate cathode slurry. All constituents of the slurry are uniformly dispersed within a short time by steps of powder dispersion, high-viscosity stirring, low-viscosity stirring, viscosity tests, vacuum defoaming and the like. The prepared slurry is high in uniformity and excellent in stability, meanwhile, the adhesive strength of a battery pole piece prepared according to the method is improved, and thus, the consistency and the electrochemical performance of the battery are enhanced. The preparation method has the characteristics of short preparation time, low device abrasion, low production energy consumption, high dispersion effect and the like. A lithium battery prepared from the lithium iron phosphate cathode slurry provided by the invention has low internal resistance, is difficult to generate heat, and also has the advantages of high energy density, good cycle performance and long service lifetime.

Description

Technical field [0001] This patent relates to the field of lithium ion batteries, and specifically relates to a preparation process and method of lithium iron phosphate cathode material slurry. Background technique [0002] With the global shortage of petroleum 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 is its power source. Lithium-ion batteries have the advantages of high energy density, low 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] Lithium-ion batteries generally include a positive electrode sheet, a negative electrode sheet, and a separator spaced between the positive electrode sheet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCH01M4/1397Y02E60/10
Inventor 田东
Owner 田东
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