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Spherical graphite with median diameter of 11 to 16 mu m and preparation method thereof

A spherical graphite, median diameter technology, used in grain processing, cyclone devices, etc., can solve the problems of reduced battery reversible capacity, small specific surface area, etc., to improve electrochemical performance, improve battery capacity, reversible capacity and coulomb Efficiency improvement effect

Inactive 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

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

[0015] The preparation method of spherical graphite with a median diameter of 11-16 μm adopts a five-stage powder refinement unit composed 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, the tap density is 1.07-1.10g / ml, and the number of openings on the surface of the graphite powder i...

Embodiment 1

[0018] The preparation method of spherical graphite with a median diameter of 16 μm, the preparation steps are:

[0019] Step 1. Send the natural flake graphite raw material with a particle size of 50 mesh to 325 mesh and a carbon content of more than 60% into the first-stage airflow vortex powder refiner for powder refinement to reduce the particle size. The speed of the powder refinement disk in the airflow vortex powder refiner is 2300 revolutions per minute, and the speed of the impeller of the inner classifier in the airflow vortex powder refiner is 200 revolutions per minute. After 60 seconds, the graphite powder Send it to the cyclone separator to separate the graphite powder with a particle size > 5 μm, and send the graphite powder with a particle size > 5 μm to the next-stage airflow vortex powder refiner to continue the powder refinement process, and the separated graphite dust Send it to the pulse dust recovery device;

[0020] Step 2. The graphite powder with a pa...

Embodiment 2

[0026] A spherical graphite with a median diameter of 14 μm and a tap density of 1.08 g / ml, the number of openings on the surface of the graphite powder is 30 to 65 per μm, and its preparation method is as follows:

[0027] Step 1. Send the natural flake graphite raw material with a particle size of 50 mesh to 325 mesh and a carbon content of more than 60% into the first-stage airflow vortex powder refiner to implement the powder refinement process to reduce the particle size. The speed of the powder refinement disc in the airflow vortex powder refiner is 2500 revolutions per minute, and the speed of the inner classifier impeller in the airflow vortex powder refiner is 150 revolutions per minute. After 50 seconds, the graphite powder Send it to the cyclone separator to separate the graphite powder with a particle size > 4 μm, and send the graphite powder with a particle size > 4 μm to the next-stage airflow vortex powder refiner to continue the powder refinement process, and th...

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Abstract

The invention discloses a preparation method of spherical graphite with a median diameter of 11 to 16 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 tap density of the obtained spherical graphite is 1.07-1.10 g / ml, and 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, the battery capacity, the standby time and the service life are effectively increased, and no overheat happens; moreover, the preparation method can improve the yield by over 75 percent, lower the cost by 38 percent, save the power consumption by 42 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 11-16 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 electrochemical performance and lithium intercalation performance of graphite materials. The sources and processing of graphite are different, and the physical and chemical properties mentioned above are also different. The structure of the electrode material itself is an important factor det...

Claims

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Application Information

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