Preparation method of low-cost composite particle graphite cathode material

A composite particle and graphite negative electrode technology, applied in chemical instruments and methods, carbon compounds, battery electrodes, etc., can solve problems such as high cost and complex process, achieve smooth de-intercalation, improve charge and discharge performance, and save costs

Inactive Publication Date: 2019-05-14
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the technology generally adopts the granulation process for granulation, and then graphitizes the composite particles. The process is more complicated and the cost is higher.

Method used

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  • Preparation method of low-cost composite particle graphite cathode material
  • Preparation method of low-cost composite particle graphite cathode material
  • Preparation method of low-cost composite particle graphite cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A1. Mix 5 μm pitch coke and pitch powder at a ratio of 100:1, and use a V-type mixer for mixing. The speed of the V-type mixer is 500 rpm, and the mixing time is 30 minutes. After mixing evenly, the mixture is obtained;

[0028] A2. Put the above mixture into the graphitization furnace for graphitization treatment. Firstly, use the heating rate = 50°C / h and power on for 4 hours to reach 200°C; then use the heating rate = 100°C / h and power on for 5 hours to reach 700°C ; Then use the heating curve of the conventional graphitization process to raise the temperature to 3050°C; finally, naturally cool it to below 200°C to get the composite particle graphitization material;

[0029] A3. Classify the above-mentioned composite granular graphitized material, and control the material D 50 =8-20μm, D 100 =40-55μm, to obtain graded materials;

[0030] A4, the above-mentioned graded materials are screened and demagnetized and packaged to obtain a composite particle graphite negat...

Embodiment 2

[0032] Mix 8μm needle coke calcined front coke and pitch powder at a ratio of 100:10, and mix evenly to obtain a mixture; put the above mixture into a graphitization furnace for graphitization treatment: ①Use heating rate=80℃ / h power transmission for 2 hours, reaching 160°C; ②Using heating rate = 150°C / h and power supply for 3h, reaching 610°C; ③Using the heating curve of conventional graphitization process to raise the temperature to 3050°C; ④Natural cooling to 50 =8-20μm, D 100 = 40-55 μm, to obtain the graded material; the above-mentioned graded material is screened and demagnetized to obtain a composite particle graphite negative electrode material, and the SEM image of the composite particle graphite negative electrode material is as follows figure 2 shown.

Embodiment 3

[0034] Mix 12μm petroleum coke and pitch powder at a ratio of 100:15, use a conical mixer at a speed of 1500rpm, and mix for 150 minutes to obtain a mixture; put the above mixture into a graphitization furnace for graphitization treatment ① Use Heating rate = 100°C / h and power supply for 3 hours, reaching 300°C; ② Adopting heating rate = 200°C / h and power supply for 1 hour, reaching 500°C; ③ Adopting the heating curve of conventional graphitization process to raise the temperature to 3050°C; ④ Natural cooling to 50 =8-20μm, D 100 = 40-55 μm, to obtain the graded material; the above-mentioned graded material is screened and demagnetized to obtain a composite particle graphite negative electrode material, and the SEM image of the composite particle graphite negative electrode material is as follows image 3 shown.

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Abstract

The invention provides a preparation method of a low-cost composite particle graphite cathode material. The preparation method includes the steps: mixing coke materials and asphalt powder according tothe weight ratio of 100:1 to 100:20 to obtain mixed materials; placing the mixed materials into a graphitization furnace for graphitization to obtain the composite particle graphitization materials;grading the composite particle graphitization materials to obtain graded materials; screening and demagnetizing the graded materials to obtain the composite particle graphite cathode material. A composite granulating process and a graphitization process are integrated, the cost of the composite granulating process is saved, and the charge and discharge performance of the material is improved.

Description

technical field [0001] The invention relates to the technical field of graphite negative electrode materials, in particular to a composite particle, a graphite negative electrode material for EV / HEV and a preparation method thereof. Background technique [0002] In recent years, the domestic electric vehicle market has developed rapidly, and the sales and demand for electric vehicles have become increasingly strong. Graphite is the most suitable negative electrode material for rechargeable batteries under the existing system, which has good conductivity and gram capacity performance. Due to the obvious anisotropy of single-particle graphite materials, it still cannot meet the needs of high-rate and fast charging of power lithium-ion batteries. [0003] At present, the granulation process is widely used in technology for compound granulation. [0004] Chinese patent CN201610736197.4 is thermally polymerized by petroleum coke or pitch coke at a temperature of 350~500°C (ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205H01M4/587H01M4/36H01M10/0525
CPCY02E60/10
Inventor 单兵凯刘可肖志超李旦皮涛王志勇邵浩明余梦泽
Owner HUNAN SHINZOOM TECH
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