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Spherical graphite with median diameter of 3 to 10 mu m and preparation method thereof

A technology of spherical graphite and median diameter, which is applied in grain processing, swirl devices, etc., can solve problems affecting the stability of graphite performance, achieve reversible capacity, increase Coulombic efficiency, good sphericity, and good lithium intercalation performance.

Active Publication Date: 2010-10-06
LUOYANG GUANQI INDAL & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But too many openings will also affect the stability of graphite properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The preparation method of spherical graphite with a median diameter of 3-10 μm adopts a five-stage powder refinement unit consisting of an airflow vortex powder refiner and a cyclone separator, and an airflow vortex spheroidizer and a spheroidizer The 14-stage spheroidizing units are connected in series. The graphite raw material enters from the first powder refining unit, flows through five powder refining units and 14 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 specific surface area is 8.0-12m 2 / g, the number of openings on the surface of the graphi...

Embodiment 1

[0023] The preparation method of spherical graphite whose median diameter is 10 μm, its preparation steps are as follows:

[0024] Step 1. Use natural flake graphite with a particle size of 50 mesh to 325 mesh and a carbon content of more than 60% as raw material, and first send the raw material to the first group of air vortex powder refiners for the first powder The refinement process of the airflow vortex powder refiner is 2600r / min, the speed of the inner classifier impeller in the airflow vortex powder refiner is 200r / min, and the time for the powder refinement process is 50 seconds , after the graphite powder flows out, it will automatically flow to the cyclone separator of the first group;

[0025] Step 2: After the graphite powder refined in step 1 flows to the cyclone separator, the graphite powder with a particle size of 3 μm-80 μm is separated by the cyclone separator, and the graphite powder of 3 μm-80 μm flows to the second group of air flow vortex The graphite d...

Embodiment 2

[0036] The preparation method of spherical graphite with a median diameter of 8 μm is as follows:

[0037] Step 1. Use natural flake graphite with a particle size of 50 mesh to 325 mesh and a carbon content of more than 60% as raw material, and first send the raw material to the first group of air vortex powder refiners for the first powder The refinement process of the airflow vortex powder refiner is 2700r / min, the speed of the inner classifier impeller in the airflow vortex powder refiner is 400r / min, and the time of the powder refinement process is 55 seconds , after the graphite powder flows out, it will automatically flow to the cyclone separator of the first group;

[0038] Step 2. After the graphite powder refined in step 1 flows to the cyclone separator, the graphite powder with a particle size of 2.5 μm-65 μm is separated through the cyclone separator, and the graphite powder with a particle size of 2.5 μm-65 μm flows to the second group The airflow vortex powder re...

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Abstract

The invention discloses a preparation method of spherical graphite with a median diameter of 3 to 10 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 specific surface area of 8.0 to 12 m<2> / g. The number of openings on the surface of the graphite powder is 6-65 per mu m. The sphericity of the product is high; the electrochemical performance is obviously improved; the battery capacity, the standby time and the service life are effectively increased; moreover, the preparation method can improve the yield by over 90 percent, lower the cost by 50 percent, save the power consumption by 60 percent and realize the dust recovery rate up to 100%.

Description

technical field [0001] The invention relates to a graphite powder, specifically a spherical graphite with a median diameter of 3-10 μm and a preparation method thereof. Background technique [0002] As a negative electrode material for lithium ion batteries, graphite material has the advantages of good conductivity, excellent charge and discharge voltage platform, high specific capacity and low price, so it has always been a research hotspot of negative electrode materials and has 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 performance of graphite materials. Graphite has different sources and processing processes, and its above-mentioned physical and chemical properties are also different. Therefore, in order to obtain graphite anode materials with good lithium intercalation performance in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B04C9/00B02C19/06
Inventor 侯玉奇
Owner LUOYANG GUANQI INDAL & TRADE
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