A kind of pretreatment method of artificial graphite material and obtained product and application

An artificial graphite and pretreatment technology, which is applied in the direction of graphite, electrical components, battery electrodes, etc., can solve the problems of low compaction density and imperfect surface correction of particles, and achieve stable material properties, simple and feasible production process, and convenient operation Effect

Active Publication Date: 2018-07-20
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method to improve the powder compaction of artificial graphite materials in order to overcome the defect that the particle surface modification of the existing artificial graphite materials is not perfect and there is no follow-up treatment such as sieving, resulting in low compaction density. Density, but does not affect the original particle size distribution and capacity and efficiency of the material, and at the same time increases the shape regularity of the material, good safety, stable properties, and almost no difference between batches. Artificial graphite material pretreatment method and Resulting products and applications

Method used

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  • A kind of pretreatment method of artificial graphite material and obtained product and application
  • A kind of pretreatment method of artificial graphite material and obtained product and application
  • A kind of pretreatment method of artificial graphite material and obtained product and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Artificial graphite material (referred to as raw material A), the D50 marked on the product is about 16 μm, the raw material is 2kg in total, the volume average particle diameter D50 of the sample before processing is 16.4 μm, and the true density is 2.24g / cm 3 , compacted density 1.49g / cm 3 .

[0028] (1) Put the artificial graphite material in a drying oven and dry it at 150°C for 1.5 hours until the moisture in it accounts for ≤2% of the total mass of the material;

[0029] (2) Check whether the equipment of the fusion machine is running normally, clean the fusion machine to ensure that there are no impurities; put 2kg of artificial graphite material with a D50 of 16.4μm into the high-speed modified fusion machine for mixing, the time is 3 minutes, and the speed is 1700r / m; after that, the material can be sieved, and the sieve mesh number is 250 mesh.

[0030] After testing, the particle size of the treated artificial graphite material is 16.0μm, and the true dens...

Embodiment 2

[0032] Artificial graphite material (denoted as raw material B), the D50 marked on the product is about 18 μm, the raw material is 2kg in total, the volume average particle diameter D50 of the sample before processing is 18.2 μm, and the true density is 2.25g / cm 3 , compacted density 1.47g / cm 3 .

[0033] (1) Put the artificial graphite material in a drying oven and dry it at 150°C for 1.5 hours until the moisture in it accounts for ≤2% of the total mass of the material;

[0034] (2) Check whether the equipment of the fusion machine is running normally, clean the fusion machine to ensure that there are no impurities; put 2.5kg of artificial graphite materials with a D50 of 18.2 μm into the high-speed modified fusion machine for mixing, the time is 5 minutes, and the speed is 1700r / m; after that, the material can be sieved, and the sieve mesh number is 250 mesh.

[0035] After testing, the particle size of the treated artificial graphite material is 17.5μm, and the true dens...

Embodiment 3

[0037] Artificial graphite material (denoted as raw material A), the D50 marked on the product is about 16 μm, the total raw material is 2.5kg, the volume average particle diameter D50 of the sample before processing is 16.4 μm, and the true density is 2.24g / cm 3 , compacted density 1.49g / cm 3 .

[0038] (1) Put the artificial graphite material in a drying oven and dry it at 150°C for 2.0 hours, until the moisture in it accounts for ≤2% of the total mass of the material;

[0039] (2) Check whether the equipment of the fusion machine is running normally, clean the fusion machine to ensure that there are no impurities; put 2kg of artificial graphite materials with a D50 of 16.4μm into the high-speed modified fusion machine for 10 minutes, and the speed is 1800r / m; after that, the material can be sieved, and the number of sieved meshes is 250 meshes.

[0040] After testing, the particle size of the treated artificial graphite material is 15.4μm, and the true density is 2.24g / c...

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Abstract

The invention discloses a pretreatment method of an artificial graphite material, which is characterized by comprising the following steps: (1) drying an artificial graphite material with a D50 of 16-22 microns to reach a water percent of not more than 2% of the total mass of the material, so as to obtain a dry artificial graphite material; (2) mixing the dry artificial graphite material obtained in step (1) in a high-speed modification fusion machine with a rotating speed of 1700-2200 r / min for 3-30 min, and then sieving to obtain the product. The invention also provides an artificial graphite material prepared by the pretreatment method of an artificial graphite material, and an application in preparation of cell anode materials. The tap density of the artificial graphite material of the invention is significantly improved; the whole particle size distribution is not affected, and the distribution of large and small particles is more uniform; the regularity of the morphology is improved, the morphology is modified to be more complete and uniform, and the performance of capacity and efficiency is not affected; the properties are stable, and almost no difference exists between batches.

Description

technical field [0001] The invention relates to a pretreatment method of an artificial graphite material and the resulting product and application. Background technique [0002] In recent years, the popularization of electronic devices has placed higher demands on the performance of secondary batteries. Especially the sudden emergence of lithium-ion batteries, compared with nickel-cadmium or nickel-metal hydride batteries, the use of lithium-ion batteries has higher energy density and better performance. At present, there have been many studies on improving battery performance. However, with the further improvement of battery performance requirements, it is necessary to increase the compaction density of the battery, so as to greatly improve the overall material performance of artificial graphite. [0003] Artificial graphite materials have good processing performance, but have the defect of low compaction density. During the production and processing of artificial graphit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/21H01M4/583
CPCY02E60/10
Inventor 李杰杜旭李念民乔永民刘萍苗荣荣朱从连
Owner SHANGHAI SHANSHAN TECH CO LTD
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