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Spherical graphite and preparation method thereof

A technology of spherical graphite and graphite, which is applied in the field of negative electrode materials, achieves the effects of high molding rate and yield, easy industrialization, and simple and easy methods

Active Publication Date: 2018-03-06
乌兰察布市大盛石墨新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on this, it is necessary to provide a kind of spherical graphite and its preparation method for the problem of the shape of flake graphite

Method used

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  • Spherical graphite and preparation method thereof
  • Spherical graphite and preparation method thereof
  • Spherical graphite and preparation method thereof

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preparation example Construction

[0016] The invention provides a kind of preparation method of spherical graphite, is characterized in that, comprises the following steps:

[0017] S1, providing graphite raw materials;

[0018] S2, the first grinding of the graphite raw material is carried out in a steam pulverizer with a rotation speed of 3000rpm-5000rpm and rotating clockwise, and then the second grinding is carried out in a steam pulverizer with a rotation speed of 3000rpm-5000rpm and a counterclockwise rotation. Two grinding, and the first grinding and the second grinding are alternately repeated at least twice to obtain potato-shaped graphite particles;

[0019] S3, performing the first shaping treatment on the potato-shaped graphite particles in a shaping machine with a square grinding block medium at a speed of 1000rpm-4000rpm and rotating clockwise, and then placing a cylindrical grinding block medium at a speed of 500rpm-3000rpm The second shaping treatment is carried out in a shaping machine that r...

Embodiment 1

[0036] Get 500kg specification and be the natural flake graphite of -195 purpose.

[0037]The natural flake graphite was added to a jet mill rotating clockwise at a speed of 5000rpm for initial grinding for 20 minutes, and then entered into a jet mill rotating counterclockwise for 20 minutes at the same speed. The grinding was repeated twice alternately to obtain potato-shaped graphite particles.

[0038] The potato-shaped graphite particles are rotated clockwise in a shaping machine with a square grinding block medium and the first shaping treatment is performed at a speed of 3000rpm for 40 minutes, and then put into a shaping machine with a cylindrical grinding block medium to rotate counterclockwise And the second shaping is carried out for 40 minutes at the rotating speed of 3000rpm. At this time, the potato-shaped graphite particles gradually tend to be spherical after being finely shaped, and a preform is obtained.

[0039] Carry out continuous classification to the pre...

Embodiment 2

[0056] Get 300kg of natural flake graphite whose specification is +1594.

[0057] The natural flake graphite is added into a steam pulverizer rotating clockwise at a speed of 3800rpm for initial grinding for 30 minutes, and then entered into a jet pulverizer rotating counterclockwise to grind for 30 minutes at the same speed to obtain potato-shaped graphite particles.

[0058] The potato-shaped graphite particles are rotated clockwise in a shaping machine with a square grinding block medium and the first shaping treatment is performed at a speed of 3200rpm for 38 minutes, and then put into a shaping machine with a cylindrical grinding block medium to rotate counterclockwise And the second shaping is carried out for 38 minutes at a rotating speed of 3200rpm. At this time, the potato-shaped graphite particles gradually tend to be spherical after being finely shaped, and a preform is obtained.

[0059] Carry out continuous classification to the preform, that is to say, the prefor...

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Abstract

The invention relates to a preparation method of spherical graphite. The preparation method comprises the following steps: (a) providing a graphite raw material; (b) putting the graphite raw materialinto a steam jet mill rotated clockwise and anticlockwise for alternate grinding, thereby obtaining potato-shaped graphite particles; (c) firstly putting the potato-shaped graphite particles into a shaper which contains square grinding block mediums and rotates clockwise for preliminary shaping treatment, and then putting the potato-shaped graphite particles into a shaper which contains cylindrical grinding block mediums and rotates anticlockwise for secondary shaping treatment, thereby obtaining a prefabricated product; and (d) continuously grading the prefabricated product to obtain the spherical graphite. The invention further relates to the spherical graphite. The sphericity of the spherical graphite is more than 0.95, and the specific surface area is 2.0 to 6.5 m<2> / g; the specific capacity is more than 360 mAh / g; after the spherical graphite is recycled for 500 times, the capacity retention rate can be up to 91 percent.

Description

technical field [0001] The invention relates to negative electrode materials for lithium ion secondary batteries, in particular to spherical graphite and a preparation method thereof. Background technique [0002] At the end of the 20th century, lithium-ion batteries were favored by people for their small size, easy portability, long cycle life, and environmental protection. Graphite material has a hexagonal crystal layered structure and is used as a negative electrode material for lithium-ion batteries. In particular, natural flake graphite is widely used in lithium-ion battery anode materials due to its wide range of sources and low price. However, the appearance and shape of natural flake graphite are flaky, and its energy density, lithium ion intercalation and deintercalation will be greatly affected when directly used, and its safety is not guaranteed. Therefore, it is necessary to process the shape of flake graphite to overcome the inherent defects of flake graphite,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 冯向阳安军伟
Owner 乌兰察布市大盛石墨新材料股份有限公司
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