Spherical graphitic corpuscule composite carbon material and preparation thereof

A technology of spherical graphite and composite carbon is applied in the field of spherical graphite particle composite carbon material and its preparation, and achieves the effects of good chemical and thermal stability, reliable performance and simple preparation process

Active Publication Date: 2008-11-05
LUOYANG GUANQI INDAL & TRADE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, spherical graphite has changed the crystal structure and microstructure of ordinary natural graphite, but it can only increase the rhombohedral crystal structure of natural graphite from about 20% to about 40%; The improvement of the rhombohedral crystal structure in the structure has a significant impact on the improvement of the electrochemical capacity of graphite

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0026] A kind of preparation method of spherical graphite particle composite carbon material of the present invention comprises the following steps:

[0027] 1. Adopt a pulverizer-PCS system composed of a fine-toothed stator and a modular crushing disc, add natural graphite into the pulverizer, and use a speed of 400-800rpm to make graphite particles collide, curl, Surface treatment such as kneading, compacting, agglomeration, and coating takes 30-60 minutes, and the processing is repeated for more than two times. The rhombohedral crystal structure of natural graphite is increased from about 20% to more than 80%, and spherical graphite is obtained.

[0028] 2. Purifying the obtained spherical graphite, washing the purified graphite until the pH value is neutral, dehydrating and drying.

[0029] 3. Mix and coat the above-mentioned treated graphite particles with non-ferrous metals to form coated graphite, and then perform graphitization treatment to obtain a composite carbon ma...

Embodiment 1

[0037]Use near-nuclear pure graphite as raw material, with a particle size of 100 mesh and a carbon content of 99.99%. It is added to the pulverizer-PCS system composed of a stator with a fine-tooth structure and a module-shaped pulverizing disc, and the graphite is crushed at a speed of 800rpm. The particles are subjected to surface treatment such as collision, curling, rubbing, compacting, agglomeration, and coating. The time is 60 minutes, and the processing is repeated 4 times. The rhombohedral crystal structure of natural graphite is increased from about 20% to 85%, and a spherical shape is obtained. graphite. Purify the obtained spherical graphite (the purification treatment method follows the method of night phase method ZL: 200410010264.1 or ultra-high purity purification method ZL: 200610127388.7), and wash the purified graphite until the pH value is neutral, dehydrate and dry . Add the above treated graphite particles to AgNO with a concentration of 1M 3 Immerse in...

Embodiment 2

[0039] Use near-nuclear pure graphite as raw material, with a particle size of 200 mesh and a carbon content of 99.99%. It is added to the pulverizer-PCS system composed of a stator with a fine-tooth structure and a module-shaped pulverizing disc, and the graphite is crushed at a speed of 600rpm. The particles are subjected to surface treatment such as collision, curling, rubbing, compacting, agglomeration, and coating. The time is 30 minutes, and the processing is repeated 6 times. The rhombohedral crystal structure of natural graphite is increased from about 20% to 90%, and a spherical shape is obtained. graphite. Purifying the obtained spherical graphite, washing the purified graphite until the pH value is neutral, dehydrating and drying. Mix and coat the above-mentioned treated graphite particles with non-ferrous metals, that is, add the treated graphite particles to AgNO with a concentration of 1M 3 Immerse in the solution for 24 hours at a temperature of 100 ° C, the so...

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Abstract

The invention provides a spherical graphite corpuscle compound carbon material, which is a compound graphite composed of spherical graphite with a clad sheet of nonferrous metal; the graphite that is almost the nuclear pure grade is adopted as the raw material, then a PCS system is utilized to collide, curl, knead, compact, conglobate and clad the graphite corpuscle for surface treatment, the rhombus crystal structure of the natural graphite is improved from 20 percent to about 80 percent, then nonferrous elements is clad or inserted into the interlamination of the spherical graphite crystal, the direction of the clad compound material is changed from uniform direction to random direction and the clad compound material has low specific area and high stacking density. The beneficial effect is that: the clad spherical graphite completely changes the crystal structure and microstructure of the natural graphite, and has large electrochemical capacity, good chemical and thermo-stability and high charge-discharge efficiency; meanwhile, the clad spherical graphite can not only be used as the cathode material of the lithium ionization cell but also can be used as the raw materials for isotropic high-end graphite products such as nuclear graphite; In addition, the production technology is simple, the cost is low and the performance is reliable.

Description

technical field [0001] The invention relates to a composite carbon material, in particular to a spherical graphite particle composite carbon material and a preparation method thereof. Background technique [0002] Traditional mineral processing methods, including deeply processed graphite powder products, cannot be used as anode materials for lithium-ion batteries. The new energy industry in the 21st century has put forward higher requirements for the use of new energy materials. At the end of the 20th century, it was discovered that lithium ions intercalated between graphite layers can form a multi-level interlayer compound, and its conductivity is close to that of metallic silver, thus making graphite a leap into the electrochemical industry. New energy materials with large capacity, good chemical and thermal stability, and high charge and discharge efficiency. The realization of this advantage, that is, industrial application, depends on graphite products changing their ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 候玉奇候旭异
Owner LUOYANG GUANQI INDAL & TRADE
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