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Preparing method of high- capacity intermediate phase coal micro powder

A technology of mesophase carbon micropowder and mesophase carbon microspheres, which is applied in the field of preparation of high-capacity mesophase carbon micropowder, can solve the problems of not very significant product yield, complicated preparation process, and difficult to obtain ingredients, etc., to achieve The preparation method is simple and feasible, the adaptability is good, and the effect of comprehensive performance is excellent

Pending Publication Date: 2017-02-22
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The deficiencies of the various improved methods reported in the above literature are that either the preparation process is complicated, or the added ingredients are not easy to obtain, or the product yield is not very significant, which increases the production cost

Method used

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  • Preparing method of high- capacity intermediate phase coal micro powder
  • Preparing method of high- capacity intermediate phase coal micro powder
  • Preparing method of high- capacity intermediate phase coal micro powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The mesophase carbon microsphere raw material is pulverized and pretreated to obtain mesophase carbon microsphere raw powder with a particle size of 20 μm;

[0027] Under stirring, alternately add mesophase carbon microsphere green ball powder 200kg and graphitization catalyst SiO 2 Mix 16kg evenly, and mix with 60kg of petroleum pitch below 0.1mm in the kneading pot;

[0028] Carry out kneading treatment at 160°C for 1 hour. After the kneading is completed, press it into a 4mm tablet in a tablet press, and then crush it into particles with a particle size of less than 100 μm, and hot isostatically press it into a block;

[0029] Then carry out high-temperature catalytic graphitization treatment at 2800°C for 36 hours to obtain mesophase carbon powder with a particle size D50 of 17.8 μm. The half-cell capacity is 362.5mAh / g, and the first-time efficiency is 95.8%.

Embodiment 2

[0031] The mesophase carbon microsphere raw material is pulverized and pretreated to obtain mesophase carbon microsphere raw powder with a particle size of 30 μm;

[0032] Under stirring, alternately add 200kg of mesophase carbon microsphere green ball powder and 6kg of graphitization catalyst SiC, mix evenly, and mix with 20kg of petroleum pitch powder below 0.1mm into the kneading pot;

[0033] The kneading process was carried out at 160°C for 1 hour. After the kneading was completed, it was pressed into a tablet shape of 3 mm in a tablet machine, and then crushed into particles with a particle size of less than 100 μm, and hot isostatically pressed into a block.

[0034] Then carry out high-temperature catalytic graphitization treatment at 3000°C for 48 hours to obtain mesophase carbon powder with a particle size D50 of 18.3 μm, a half-cell capacity of 363.1mAh / g, and an initial efficiency of 95.2%.

Embodiment 3

[0036] The mesophase carbon microsphere raw material is pulverized and pretreated to obtain mesophase carbon microsphere green pellet powder with a particle size of 25 μm;

[0037] Under stirring, alternately add mesophase carbon microsphere green ball powder 200kg and graphitization catalyst SiO 2 Mix 10kg evenly, and mix with 100kg coal tar pitch powder below 0.1mm in the kneading pot;

[0038] Carry out kneading treatment at 160°C for 1 hour. After the kneading is completed, press it into a tablet shape of 5 mm in a tablet machine, and then crush it into particles with a particle size of less than 100 μm, and hot isostatically press it into a block;

[0039] Then carry out high-temperature catalytic graphitization treatment at 3200°C for 48 hours to obtain mesophase carbon powder with a particle size D50 of 17.4 μm, a half-cell capacity of 365.0mAh / g, and an initial efficiency of 95.6%.

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Abstract

The invention relates to the technical field of intermediate phase coal micro powder preparation, and particularly relates to a preparing method of high-capacity intermediate phase coal micro powder. The preparing method of the high-capacity intermediate phase coal micro powder is characterized by comprising the first step of smashing and pretreatment, the second step of mixing, the third step of hot isostatic pressure treatment, and the fourth step of catalytic graphitization and high-temperature treatment. An adhesive is one of petroleum asphalt and coal pitch; graphitization catalyst is one or more of carbides or oxides of one or more of silicon, iron, tin and boron. Compared with the prior art, the preparing method of the high-capacity intermediate phase coal micro powder is simple and practicable in preparing method and is applicable to industrial production; the prepared high-capacity intermediate phase coal micro powder has high charge-discharge rate and good cycle performance, and a button cell prepared from the coal micro powder has good overall performance.

Description

technical field [0001] The invention relates to the technical field of preparation of mesophase carbon powder, in particular to a preparation method of high-capacity mesophase carbon powder. Background technique [0002] The mesophase carbon graphitized product is an excellent negative electrode material for lithium-ion batteries. In recent years, lithium-ion batteries have been widely used in mobile phones, notebook computers, digital cameras and portable appliances. Lithium-ion batteries have excellent performances such as high energy density, high working voltage, small size, light weight, no pollution, fast charging and discharging, and long cycle life. They are ideal energy sources for development in the 21st century. Mesophase carbon, as the negative electrode material of lithium-ion secondary batteries, has the characteristics of low potential, good flatness, high specificity, high initial charge and discharge efficiency, and good processability. Theoretically LiC 6...

Claims

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Application Information

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IPC IPC(8): C01B32/05
CPCC01P2006/12C01P2006/10C01P2006/40C01P2004/61
Inventor 谢秋生仲林陈然李念民
Owner SHANGHAI SHANSHAN TECH CO LTD
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