Modified graphite, composite graphite material containing the modified graphite and their preparation methods and application

A composite graphite and graphite technology, applied in the directions of graphite, electrical components, battery electrodes, etc., can solve the problems of low compaction density of negative electrode materials, and achieve the effects of excellent comprehensive performance, good electrochemical performance and good safety.

Active Publication Date: 2012-06-06
福建杉杉科技有限公司
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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 defect of low compaction density of the existing natural g...

Method used

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  • Modified graphite, composite graphite material containing the modified graphite and their preparation methods and application
  • Modified graphite, composite graphite material containing the modified graphite and their preparation methods and application
  • Modified graphite, composite graphite material containing the modified graphite and their preparation methods and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] ①Crush the high-temperature petroleum asphalt to less than 0.1mm, and stir the spherical natural graphite (D 50 16.1 μm) 18kg and 2kg of the high-temperature petroleum asphalt powder are alternately added to the reactor and mixed, and then heat-coated;

[0043] ② After coating, under the protection of nitrogen, carry out surface carbonization treatment at a constant temperature of 1100°C for 2 hours, and cool to room temperature to obtain surface-modified spherical graphite;

[0044] ③Spherical graphite 12kg treated with surface modification and graphitization catalyst Fe 2 o 3 1kg is alternately added to the cantilever double-helix conical mixer and mixed;

[0045] ④Carry out high-temperature catalytic graphitization treatment at 2800°C for 48 hours to obtain modified graphite;

[0046] 5. Mix the modified graphite and the artificial graphite uniformly at a mass ratio of 80:20 to obtain a composite graphite material, the first discharge capacity of the half-cell is ...

Embodiment 2

[0048] ①Crush the high-temperature petroleum asphalt to less than 0.1mm, and stir the spherical natural graphite (D 50 16.5 μm) 18kg and 2kg of the high-temperature petroleum asphalt powder are alternately added to the reactor and mixed for heat coating treatment;

[0049] ② After coating, under the protection of nitrogen, carry out surface carbonization treatment at a constant temperature of 800°C for 6 hours, and cool to room temperature to obtain surface-modified spherical graphite;

[0050] 3. the spherical graphite 20kg of described surface modification process and graphitization catalyst SiO 2 2kg is alternately added to the cantilever double-helix conical mixer and mixed;

[0051] ④Carry out catalytic graphitization high temperature treatment at 3000°C for 50 hours to obtain modified graphite;

[0052] 5. Mix the modified graphite and the artificial graphite uniformly at a mass ratio of 90:10 to obtain a composite graphite material, the first discharge capacity of th...

Embodiment 3

[0054] ①Crush the modified coal tar pitch to less than 0.1mm, and stir the spherical natural graphite (D 50 16.1 μm) 18kg and 2kg of the modified coal tar pitch powder are alternately added to the reactor and mixed, and then heat-coated;

[0055] ② After coating, under the protection of nitrogen, carry out surface carbonization treatment at a constant temperature of 1500°C for 3 hours, and cool to room temperature to obtain surface-modified spherical graphite;

[0056] 3. The spherical graphite 28.5kg of described surface modification process and graphitization catalyst B 2 o 3 1.5kg is alternately added to the cantilever double-helix conical mixer and mixed;

[0057] ④Carry out high-temperature catalytic graphitization treatment at 3200°C for 30 hours to obtain modified graphite;

[0058] 5. Mix the modified graphite and the artificial graphite uniformly at a mass ratio of 50:50 to obtain a composite graphite material, the first discharge capacity of the half-cell is 365.0...

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Abstract

The invention provides a preparation method of a modified graphite. The preparation method of the modified graphite comprises the following steps of 1, coating an amorphous carbon precursor on the surface of natural graphite, 2, carrying out surface carbonization at a temperature of 800 to 1500 DEG C, and cooling to a room temperature to obtain surface-modified graphite, 3, mixing the surface-modified graphite and one or more graphitization catalysts, and 4, carrying out catalytic graphitization high-temperature treatment at a temperature of 2800 to 3200 DEG C. The invention also provides a composite graphite material containing the modified graphite and its preparation method and application. The preparation methods are simple and can be realized easily. Raw materials of the modified graphite and the composite graphite material containing the modified graphite have wide sources and low costs. The composite graphite material containing the modified graphite can effectively reduce a specific surface area, and improve compacted density and a gram capacity. A cell prepared from the composite graphite material containing the modified graphite has the advantages that compacted density is high; electrochemistry performances are good; a discharge plateau and a plateau retention rate are high; heavy current charging and discharging performances, circulation performances and safety are good; and product properties are stable.

Description

technical field [0001] The invention relates to a modified graphite, a composite graphite material containing the modified graphite and their preparation method and application, in particular to a modified graphite obtained by surface modification treatment and catalytic graphitization high temperature treatment of natural graphite , and the composite graphite material obtained after compounding the modified graphite and artificial graphite, and their preparation method and application. Background technique [0002] In recent years, lithium-ion batteries have been widely used in mobile phones, notebook computers, digital video 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. With the increasing requirements of various products for sma...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01M4/583C01B32/21
CPCY02E60/12Y02E60/10
Inventor 李辉谢秋生张华杜旭
Owner 福建杉杉科技有限公司
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