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Pre-treatment method of asphalt and spherical graphite negative electrode material coated by using asphalt

A technology of spherical graphite and negative electrode materials, applied in building insulation materials, battery electrodes, building components, etc., can solve problems such as high cost, lack of industrialization conditions, and complicated processing process, and achieve simple production equipment and low energy consumption. Effect

Active Publication Date: 2013-12-11
CHINA SCI HENGDA GRAPHITE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production method is simple when solid-phase mixing is used, but the quality of the production process is not easy to control, especially the integrity of the asphalt micropowder coating is difficult to guarantee; the conditions of vapor phase deposition are relatively harsh, the cost is high, and the conditions for industrialization are not yet available; liquid phase When mixing and coating, the asphalt is dissolved in an organic solvent, and then mixed, after a high temperature treatment at 400-500 ° C, the solvent is evaporated to form an intermediate phase asphalt, and the graphite is coated, light asphalt, solvent and other processes are removed, and then carbonized , forming coated carbon on the surface of carbon particles. The negative electrode material obtained by this method has good cycle performance, but the process of this method is complicated, and the operation of the high-temperature reactor is troublesome. Especially after the reaction, it is easy to agglomerate and needs to be crushed. quality control impact

Method used

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  • Pre-treatment method of asphalt and spherical graphite negative electrode material coated by using asphalt

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Experimental program
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Effect test

Embodiment 1

[0035] 1) Pulverize petroleum asphalt with a softening point of 250°C with a stainless steel pulverizer equipped with a water cooling device, pass through a 100-mesh sieve, and take the undersieve for later use; add 60kg of deionized water and 0.35kg of OP-4 to the container, and stir Evenly, then add 17.5kg of asphalt powder, mix and prepare a suspension;

[0036] 2) Add the suspension to a sand mill for grinding. The grinding medium is zirconia of about 1 mm. Grind until the asphalt particle size D50 measured by sampling is 3 μm. After grinding, homogenize the ground slurry in a homogenizer. Qualitative treatment to obtain a bitumen dispersion, and complete the treatment process before the bitumen is coated with spherical graphite.

Embodiment 2

[0038] 1) Crush petroleum asphalt with a softening point of 280°C, pass through a 50-mesh sieve, and take the sieve for later use; add 40kg of deionized water and 0.02kg of octadecyltrimethylammonium chloride to the container, and stir evenly. Then add 17.5kg of asphalt powder, mix and prepare suspension at normal temperature;

[0039] 2) Add the suspension to the colloid mill for grinding at room temperature, and detect the particle size of the asphalt immediately. When the D50 is 4 μm, the grinding is over; homogenize the ground slurry in a homogenizer to obtain asphalt dispersion Liquid, complete the treatment process before asphalt coating spherical graphite.

Embodiment 3

[0041] 1) Crush the coal tar pitch with a softening point of 250°C, pass through a 80-mesh sieve, and take the sieve for later use; add 150kg of deionized water and 0.5kg of sodium dodecylsulfonate to the container, stir well, and then add 17.5 kg asphalt powder, mixed to make a suspension;

[0042] 2) Add the suspension to the colloid mill for grinding, and detect the particle size of the asphalt immediately. When the D50 is 5 μm, the grinding is completed; the ground slurry is homogenized in the homogenizer to obtain the asphalt dispersion, and the completion The treatment process before pitch coating spherical graphite.

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Abstract

The invention discloses a pre-treatment method of asphalt and a spherical graphite negative electrode material coated by using the asphalt. The pre-treatment method of the asphalt comprises the following steps: crushing and sieving the asphalt, getting screen underflow and adding water and a surfactant for uniformly mixing to prepare suspension liquid; adding the suspension liquid into a sand mill or a colloid mill and grinding to obtain asphalt dispersion liquid; homogenizing the asphalt dispersion liquid in a strong homogenizing machine to complete a treatment process before coating spherical graphite with the asphalt; and carrying out semi-humid mixing by utilizing the asphalt dispersion liquid and the spherical graphite, drying the moisture after the mixing is completed, and dispersing and sieving after carrying out high-temperature treatment to obtain the negative electrode material. According to the pre-treatment method of the asphalt and spherical graphite negative electrode disclosed by the invention, the asphalt is dispersed in water to form the suspension liquid, grinding is carried out to obtain sheet-type and flocculent asphalt micro powder, homogenizing and efficient dispersing are carried out, then, semi-humid mixing with the spherical graphite and the drying are carried out, and high-temperature carbonization treatment is carried out to obtain the negative electrode material. The pre-treatment method disclosed by the invention is simple in treatment process, energy-saving and environment-friendly, and lower in cost. Moreover, the obtained negative electrode material is excellent in performances.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials, in particular to a pitch pretreatment method for coating spherical graphite, through which a pitch dispersion liquid is obtained, and then the pitch dispersion liquid is used to coat spherical graphite to obtain a negative electrode material. Background technique [0002] Graphite negative electrode materials include artificial graphite negative electrode materials and natural graphite negative electrode materials. Graphite anode materials are generally processed from graphite materials into spherical micropowders. Low-grade products are directly used as anode materials, and high-end products must go through the process of coating, carbonization and graphitization. Spherical graphite powder coating refers to the use of asphalt, resin, sugar and other polymer materials to wrap the surface of graphite particles, and then directly wrap amorphous carbon through high-temperature c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/05C08L95/00H01M4/583
CPCY02E60/12Y02E60/10
Inventor 傅云峰邹琴柯书龙
Owner CHINA SCI HENGDA GRAPHITE
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