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Spherical graphite with median diameter of 6-14 μm and preparation method thereof

A technology of spherical graphite and median diameter, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of reduced battery reversible capacity, small specific surface area, etc., and achieve improved electrochemical performance, increased battery capacity, and good lithium intercalation performance effect

Active Publication Date: 2012-02-22
LUOYANG GUANQI INDAL & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it requires graphite powder to have a very small specific surface area, and too small a specific surface area will lead to a decrease in the reversible capacity of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The preparation method of spherical graphite with a median diameter of 6-14 μm adopts five powder refinement units composed of an airflow vortex powder refiner and a cyclone separator, and an airflow vortex spheroidizer and a spheroidizer The fourteen spheroidizing units are connected in series. The graphite raw material enters from the first powder refining unit, flows through five powder refining units and fourteen spheroidizing units in turn, and then the last spheroidizing unit Outflow, the graphite raw material undergoes powder refinement and spheroidization process to obtain spherical graphite products. The number of sets of powder refining units and spheroidizing units can also be adjusted according to needs. The prepared spherical graphite product has a closed end structure on the surface, the shape of the graphite powder is spherical, the surface has openings, and its true density is 2.28-2.3g / cm 3 , the number of openings on the powder surface is 9-80 / μm.

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Embodiment 1

[0026] The spherical graphite whose median diameter is 14 μm, its preparation method is:

[0027] 1. The method of powder refinement, according to the sequence of five powder refinement units composed of air vortex powder refiner and air vortex separator connected in series, the powder refinement process is carried out on the natural flake graphite raw material in sequence, In order to reduce the particle size of graphite powder, the steps of its powder refinement process are:

[0028] Step 1. Send the natural flake graphite raw material with a particle size of 50 mesh to 325 mesh and a carbon content > 65% into the airflow vortex powder refiner in the first group to implement the powder refinement process, and the airflow vortex The rotating speed of the powder refining disc in the rotary powder refining machine is 2000r / min, the rotating speed of the inner classifier impeller in the airflow vortex powder refining machine is 400r / min, and the graphite powder is refined from t...

Embodiment 2

[0043] The spherical graphite whose median diameter is 12 μm, its preparation method is:

[0044] 1. The method of powder refinement, according to the sequence of five powder refinement units composed of air vortex powder refiner and air vortex separator connected in series, the powder refinement process is carried out on the natural flake graphite raw material in sequence, The steps of its powder refinement process are:

[0045] Step 1. Send the natural flake graphite raw material with a particle size of 50 mesh to 325 mesh and a carbon content >70% into the airflow vortex powder refiner in the first group to implement the powder refinement process, and the airflow vortex The rotating speed of the powder refining disc in the rotary powder refining machine is 2300r / min, the rotating speed of the impeller of the inner classifier in the airflow vortex powder refining machine is 400r / min, and the graphite powder enters the airflow vortex powder refining The time for the machine ...

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Abstract

The invention discloses a preparation method of spherical graphite with a median diameter of 6 to 14 mu m. A five-level powder refining machine set consisting of an air-flow vortex powder refining machine and a cyclone separator is sequentially connected with a fourteen-level nodulizing machine set consisting of an air-flow vortex nodulizing machine and a nodulizing classifier in series; the graphite material enters from the first powder refining machine set and then flows through the five powder refining machine sets and the fourteen nodulizing machine sets in turn and finally out of the last nodulizing machine set; and by refining and nodulizing the powder, the spherical graphite product is obtained. The spherical graphite product has a surface closed end part structure, is spherical, and has the actual density of 2.28 to 2.3g / cm<3>. The number of openings on the surface of the graphite powder is 9-80 per mu m. The sphericity of the product is high, the electrochemical performance is obviously improved, and the battery capacity, the standby time and the service life are effectively increased; moreover, the preparation method can improve the yield by over 85 percent, lower the cost by 45 percent, save the power consumption by 40 percent and realize the dust recovery rate up to 100%.

Description

technical field [0001] The present invention relates to a kind of graphite powder, specifically a kind of spherical graphite with a median diameter of 6-14 μm and a preparation method thereof Background technique [0002] As a negative electrode material for lithium ion batteries, graphite materials have the advantages of good electrical conductivity, excellent charge-discharge voltage platform, high specific capacity and low price, so they have always been the research hotspot of negative electrode materials, and have been used in commercial lithium ion batteries. widely used. Many studies have shown that the shape, crystal structure, surface structure, and impurity content of graphite particles are closely related to the lithium intercalation properties of graphite materials. The source and processing process of graphite are different, and the above-mentioned physical and chemical properties are also different. Therefore, in the process of research and production, in orde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04H01M4/38
CPCY02E60/10
Inventor 侯玉奇
Owner LUOYANG GUANQI INDAL & TRADE
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