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

A natural graphite, pretreatment technology, applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of imperfect particle surface correction, low tap density, etc., to achieve simple and feasible pretreatment method, stable properties, The effect of increasing the regularity

Active Publication Date: 2018-07-20
NINGBO SHANSHAN NEW MATERIAL TECH
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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 overcome the imperfect particle surface correction and low tap density defects of existing natural graphite materials, and to provide a pretreatment method for improving natural graphite materials and the resulting products and applications

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Natural graphite (denoted as raw material A), D50 particle size is about 20μm, the raw material is 2 kg in total, the sample is tested before pretreatment, its D50 particle size is 20.4μm, and the true density is 2.20g / cm 3 , the tap density is 1.10g / cm 3 .

[0034] The pretreatment method of natural graphite material, it may further comprise the steps:

[0035] ①Put the natural graphite in a drying oven and dry at 130°C for 1.5 hours;

[0036] ②Put 2 kg of dried natural graphite with a D50 particle size of 20.4 μm into a high-speed modified fusion machine and mix the materials for 15 minutes at a speed of 2000r / m; 22Hz, you can.

[0037] After testing, the D50 particle size of the natural graphite material is 20.1μm, and the true density is 2.20g / cm 3 , the tap density is 1.12g / cm 3 .

Embodiment 2

[0039] Natural graphite (denoted as raw material B), the D50 particle size is about 22μm, the raw material is 2 kg in total, the sample is tested before pretreatment, the D50 particle size is 22.2μm, and the true density is 2.20g / cm 3 , the tap density is 1.11g / cm 3 .

[0040] The pretreatment method of natural graphite material, it may further comprise the steps:

[0041] ①Put the natural graphite in a drying oven and dry at 130°C for 1.5 hours;

[0042] ②Put 2.5 kg of dried natural graphite with a D50 particle size of 22.2 μm into a high-speed modified fusion machine for mixing for 5 minutes at a speed of 2100r / m; 22Hz, you can.

[0043] After testing, the D50 particle size of the natural graphite material is 22.1μm, and the true density is 2.20g / cm 3 , the tap density is 1.14g / cm 3 .

Embodiment 3

[0045] Natural graphite (denoted as raw material A), D50 particle size is about 20μm, the raw material is 2 kg in total, the sample is tested before pretreatment, its D50 particle size is 20.4μm, and the true density is 2.20g / cm 3 , the tap density is 1.10g / cm 3 .

[0046] The pretreatment method of natural graphite material, it may further comprise the steps:

[0047] ①Put the natural graphite in a drying oven and dry at 130°C for 2.0 hours;

[0048] ②Put 2 kg of dried natural graphite with a particle size of D50 of 20.4 μm into a high-speed modified fusion machine for mixing for 18 minutes at a speed of 2100r / m; 22Hz.

[0049] After testing, the D50 particle size of the natural graphite material is 20.3μm, and the true density is 2.20g / cm 3 , the tap density is 1.13g / cm 3 .

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Abstract

The invention discloses a pretreatment method of a natural graphite material as well as an obtained product and application. The pretreatment method comprises the following steps of (1) drying the natural graphite; (2) continuously mixing, blending and classifying the material obtained in the step (1) for 5min to 40min at a rotation speed of 1800r / min to 2500r / min. By adopting the pretreatment method, the compaction density of the natural graphite powder can be improved, the tendency of the original granularity distribution of the material is not influenced, the appearance regularity of the material is improved, the capacity and the efficiency are not influenced, and the treated natural graphite material is good in safety, stable in property and good in consistency.

Description

technical field [0001] The invention relates to a pretreatment method of natural graphite material and the obtained product and application. Background technique [0002] With the popularization of electronic devices, there is an increasing need for secondary batteries with better performance. What is particularly eye-catching is 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, extensive research has been conducted on improving battery performance in the prior art. However, with the further improvement of battery performance requirements, it is also necessary to increase the tap density of the battery, thereby improving the overall material performance of natural graphite. [0003] Natural graphite material has good processing performance, but has the disadvantage of low tap density. During the production and processing of natural graphite ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583
CPCH01M4/133H01M4/583H01M10/0525Y02E60/10
Inventor 张华李辉乔永民杜旭李杰韩家安杨凯
Owner NINGBO SHANSHAN NEW MATERIAL TECH