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Lithium ion battery carbon negative electrode material grinding shaping technological process and production system thereof

A technology of carbon negative electrode materials and lithium-ion batteries, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of large power consumption, high production costs, and low yield of finished products, so as to improve the degree of automation and improve production efficiency Effect

Active Publication Date: 2014-07-02
ZHANJIANG JUXIN NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the existing spherical graphite powder, such as complex preparation process, uneven product quality, low finished product yield, large power consumption and high production cost, and proposes an ultra-fine graphite powder using an in-band classification device. Grinding and pulverizing machines are used to replace multiple airflow pulverizers to achieve primary pulverization. A parallel shaping system composed of multiple graphite shaping machines is used, which simplifies the processing times of spherical graphite. The process is simple, the classification control accuracy is high, and the powder particle size distribution is narrow. Natural spherical graphite powder with stable quality

Method used

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  • Lithium ion battery carbon negative electrode material grinding shaping technological process and production system thereof
  • Lithium ion battery carbon negative electrode material grinding shaping technological process and production system thereof
  • Lithium ion battery carbon negative electrode material grinding shaping technological process and production system thereof

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Effect test

Embodiment 1

[0059] The natural flake graphite with a particle size of 32 mesh and a carbon content of more than 90% is sent to the closed silo of the ultra-fine grinding mill through a high-pressure sealed pipeline with a pressure of 0.6 MPa, and the automatic quantitative feeding system feeds the carbon into the closed silo. The graphite is sent to an ultrafine grinding mill (CXM400 ultrafine mill) for internal grinding and grinding. The main engine speed of the ultrafine grinding mill is 1500rpm / min, the turbine speed of the internal submachine is 300rpm / min, and the grinding time is 30 minutes. Under the rotation of the inner grading turbine, the particles with qualified particle size flow out automatically with the airflow, and the coarse particles fall into the crushing area and continue to be crushed until they are qualified. Adjust the crushing parameters of the ultra-fine grinding mill to produce D 50 18μm graphite powder.

[0060] Will D 50 Graphite powder with a size of 18 μm a...

Embodiment 2

[0064] The natural flake graphite with a particle size of 32 mesh and a carbon content of more than 90% is sent to the closed silo of the ultra-fine grinding mill through a high-pressure sealed pipeline with a pressure of 0.6 MPa, and the automatic quantitative feeding system feeds the carbon into the closed silo. The graphite is sent to an ultrafine grinding mill (CXM400 ultrafine mill) for internal grinding and grinding. The main engine speed of the ultrafine grinding mill is 1500rpm / min, the turbine speed of the internal submachine is 300rpm / min, and the grinding time is 30 minutes. Under the rotation of the inner grading turbine, the particles with qualified particle size flow out automatically with the airflow, and the coarse particles fall into the crushing area and continue to be crushed until they are qualified. Adjust the crushing parameters of the ultra-fine grinding mill to produce D 50 23μm graphite powder.

[0065] Will D 50 Graphite powder with a size of 23μm au...

Embodiment 3

[0068] Artificial graphite with a particle size of 100 mesh and a carbon content of more than 90% is sent to the closed silo of the ultra-fine grinding mill through a high-pressure sealed pipeline with a pressure of 0.3 Pa, and the graphite in the closed silo is sent to Enter an ultrafine grinding mill (CXM400 type ultrafine mill) to grind and pulverize. The main engine speed of the ultrafine grinding mill is 2000rpm / min, the turbine speed of the internal submachine is 400rpm / min, and the grinding time is 20 minutes. Under the rotation of the inner grading turbine, the particles with qualified particle size flow out automatically with the airflow, and the coarse particles fall into the crushing area and continue to be crushed until they are qualified. Adjust the crushing parameters of the ultra-fine grinding mill to produce D 50 20μm graphite powder.

[0069] Will D 50 Graphite powder with a size of 20 μm automatically flows into the centrifugal air classifier with the air fl...

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Abstract

The invention provides a lithium ion battery carbon negative electrode material grinding shaping technological process. The process comprises the following steps: step one, feeding graphite in an inner grading ultra-fine grinding pulverizer, wherein particles with qualified sizes automatically flow out along with airflow under the rotation of an inner grading turbine, and coarse particles fall in a pulverizing area for continuous pulverizing until the particle sizes are qualified; and step two, enabling graphite powder with qualified particle diameters obtained in the step one to flow in a centrifugal classifier along with the airflow, wherein the powder with the particle size of smaller than 35 microns is discharged to a cyclone batcher from an airflow classifier material exhaust hole for collection, and coarse powder is discharged out from a return feeding hole. The ultra-fine grinding pulverizer with an inner grading device is adopted for replacing a plurality of airflow pulverizers to realize ultra-fine grinding, so that qualified fine powder is classified and extracted in time, over crushing is prevented, the product yield is improved, and the production yield is more than 90%.

Description

technical field [0001] The invention relates to the field of a method for preparing spherical graphite powder, in particular to a processing method and equipment for shaping graphite used as negative electrode materials for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have become a new generation of secondary batteries since the 1990s after nickel-metal hydride batteries because of their advantages such as high operating voltage, high energy density, long cycle life, small self-discharge, and no memory effect. During the development of lithium-ion battery technology, battery quality has been continuously improved and production costs have been continuously reduced. Anode materials have played a large role in the contribution to the technological progress of lithium-ion batteries. At present, the anode materials of commercial lithium-ion batteries are still dominated by graphite materials, among which natural graphite is widely used because of i...

Claims

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Application Information

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IPC IPC(8): H01M4/1393C01B31/04C01B32/205
CPCY02E60/122C01B32/194H01M4/04H01M4/1393Y02E60/10
Inventor 吴其修刘明东李佳坤郭庆
Owner ZHANJIANG JUXIN NEW ENERGY
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