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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  • 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 rep

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

Examples

Experimental program
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Effect test

Example Embodiment

[0058] Example 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 grinder through a high pressure sealed pipeline with a pressure of 0.6 MPa, and the closed silo is placed in the closed silo through an automatic quantitative feeding system The graphite is sent to an ultra-fine grinding mill (CXM400 type ultra-fine mill) for grinding and pulverization. The main machine speed of the ultra-fine grinding mill is 1500rpm / min, the turbine speed of the internal sub-machine is 300rpm / min, and the grinding time is 30 minutes. Under the rotation of the internal grading turbine, the particles with the qualified size will flow out automatically with the air flow, and the coarse particles will fall into the crushing zone and continue to be crushed until they are qualified. Adjust the crushing parameters of the ultra-fine grinding mill to produce D 50 It is 18μm graphite powder.

[0060...

Example Embodiment

[0063] Example 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 grinder through a high pressure sealed pipeline with a pressure of 0.6 MPa, and the closed silo is placed in the closed silo through an automatic quantitative feeding system The graphite is sent to an ultra-fine grinding mill (CXM400 type ultra-fine mill) for grinding and crushing. The main machine speed of the ultra-fine grinding mill is 1500rpm / min, the turbine speed of the internal sub-machine is 300rpm / min, and the grinding time is 30 minutes. Under the rotation of the internal grading turbine, the particles with the qualified size will flow out automatically with the air flow, and the coarse particles will fall into the crushing zone and continue to be crushed until they are qualified. Adjust the crushing parameters of the ultra-fine grinding mill to produce D 50 It is 23μm graphite powder.

[0065] Wil...

Example Embodiment

[0067] Example 3

[0068] The artificial graphite with a particle size of 100 mesh with a carbon content of 90% or more is sent to the closed silo of the ultra-fine grinding grinder through a high pressure sealed pipeline with a pressure of 0.3 Pa, and the graphite in the closed silo is sent through an automatic quantitative feeding system Into an ultra-fine grinding mill (CXM400 type ultra-fine grinding) internal grinding and grinding, the ultra-fine grinding and grinding machine main engine speed is 2000rpm / min, the internal sub-machine turbine speed is 400rpm / min, and the grinding time is 20 minutes. Under the rotation of the internal grading turbine, the particles with the qualified size will flow out automatically with the air flow, and the coarse particles will fall into the crushing zone and continue to be crushed until they are qualified. Adjust the crushing parameters of the ultra-fine grinding mill to produce D 50 It is 20μm graphite powder.

[0069] Will D 50 Graphite po...

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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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