Preparation method of lithium ion battery carbon cathode material coating layer

A carbon anode material, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficult to achieve consistency in polymerization, difficult to achieve mass production, poor safety, etc., to reduce coating costs, The effect of low cost and improved production efficiency

Active Publication Date: 2012-07-25
NINGBO HONGYUAN CARBON IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses ethanol as a solvent for fusion, it is difficult to achieve consistency in polymerization, and the safety is poor, the yield is low, and it is difficult to meet the requirements of mass production

Method used

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  • Preparation method of lithium ion battery carbon cathode material coating layer
  • Preparation method of lithium ion battery carbon cathode material coating layer
  • Preparation method of lithium ion battery carbon cathode material coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of slurry:

[0021]

[0022] First 500 grams of 4 (wt)% MC aqueous solution, and 500 grams of artificial graphite powder (d 50 = 10-20 microns) mixed, placed in the planetary mill, started the mixer, mixed and stirred for 1 hour; added 500 grams of 4 (wt)% MC aqueous solution, and stirred for 2 hours; added styrene-butadiene rubber (SBR) emulsion 300 grams (the water-gel emulsion contains 40% SBR, and the particle size is 100-150 nanometers), stirred for 1 hour; added 500 grams of deionized water and stirred for another half an hour.

[0023] The above-mentioned slurry is transported into a spray drying granulator for granulation and coating. The slurry emulsion is dispersed into mist droplets through an atomizer. The mist droplets are in contact with hot dry air to remove moisture and become powdery particles. The surface of graphite powder is coated with styrene-butadiene rubber (SBR) and methyl cellulose (MC). This step is a traditional technical met...

Embodiment 2

[0026] Preparation of slurry:

[0027]

[0028] First 400 grams of 4% hydroxypropyl methylcellulose (HPMC) aqueous solution, and 500 grams of spheroidized natural graphite powder (d 50 =10-20 micron) mix, place in planetary mill, start mixer, mix and stir 1 hour; Add 400 grams of 4 (wt)% hydroxypropyl methylcellulose (HPMC) aqueous solution, stir again 2 hours; Add butylbenzene 300 grams of rubber (SBR) emulsion (water-based emulsion containing SBR 40 (wt)%, particle size is 100-150 nanometers), stirred for 1 hour; added 500 grams of deionized water and stirred for another half an hour. The above-mentioned slurry is transported into a spray drying granulator for granulation and coating. The slurry emulsion is dispersed into mist droplets through an atomizer. The mist droplets are in contact with hot dry air to remove moisture and become powdery particles. The surface of spheroidized natural graphite powder is coated with styrene-butadiene rubber (SBR) and hydroxypropyl met...

Embodiment 3

[0031] Preparation of slurry:

[0032]

[0033] First 500 grams of 4% hydroxyethylmethylcellulose (HEMC) aqueous solution, and 500 grams of artificial graphite powder (d 50= 10-20 microns) mixed, placed in the planetary mill, started the mixer, mixed and stirred for 1 hour; added 500 grams of 4 (wt)% hydroxyethyl methylcellulose (HEMC) aqueous solution, and stirred for 2 hours; added SBR to modify 400 grams of emulsified petroleum asphalt water-gel emulsion (SBR5(wt)%+asphalt 20(wt)%+75(wt)% water) was stirred for 1 hour; 750 grams of deionized water was added and stirred for another half an hour. The above-mentioned slurry is transported into a spray drying granulator for granulation and coating. The slurry emulsion is dispersed into mist droplets through an atomizer. The mist droplets are in contact with hot dry air to remove moisture and become powdery particles. The surface of graphite powder is coated with styrene-butadiene rubber (SBR), asphalt and hydroxyethyl methy...

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PUM

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Abstract

The invention relates to a preparation method of a lithium ion battery carbon cathode material coating layer. The method is characterized by adopting a liquid-phase spray granulation method and comprising the following steps of: mixing carbon powder, polymer emulsion, stabilizer and water according to certain proportions to prepare slurry; feeding the slurry into a spray drying granulator for granulation coating; dispersing the slurry emulsion into droplets by an atomizer, wherein the droplets are in contact with the hot dry air to remove water and change into powdery particles so as to coat the surface of the carbon powder with polymer; and finally, placing the carbon powder coated with polymer in carbonization equipment, and performing carbonization treatment under the protection of nitrogen to obtain the required lithium ion battery carbon cathode material coating layer, wherein the carbonization temperature is 600-2,500 DEG C. The preparation method provided by the invention has the advantages of simple technology, easy polymerization and good safety, and can remarkably improve the production efficiency; and moreover, the preparation method has low cost and is suitable for batch production.

Description

technical field [0001] The invention belongs to the technical scope of preparation of negative electrode materials of lithium ion power batteries, in particular to a coating layer of carbon negative electrode materials of lithium ion batteries prepared by adopting a method of spray drying and granulation. Background technique [0002] The negative electrode active material is the key factor that determines the performance of lithium-ion batteries. As the negative electrode active material of lithium-ion batteries, it must meet high gravimetric specific capacity and volume specific capacity, high lithium ion intercalation / extraction rate, and good cycle performance. It has good compatibility with the electrolyte, so the first cycle efficiency is high, the high and low temperature performance is excellent, the cost is low and the environment is friendly. At present, the mainstream of negative electrode active materials for lithium-ion batteries is graphitized carbon materials,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 顾向宏
Owner NINGBO HONGYUAN CARBON IND
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