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A kind of blended pitch for coating graphite negative electrode material

A technology of graphite negative electrode and petroleum asphalt, which is applied in building insulation materials, battery electrodes, structural parts, etc., can solve the problems of low electrochemical gram capacity and high electrochemical gram capacity, reduce asphalt smoke, improve coking value, reduce The effect of volatiles

Active Publication Date: 2019-03-29
赣州市瑞富特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, coal tar pitch and petroleum pitch have their own advantages and disadvantages. Coal pitch has a high relative coking value and a dense particle coating, but the electrochemical gram capacity after graphitization is low; petroleum pitch has a low relative coking value and the particle coating has a high strength Not high, but the electrochemical gram capacity is higher after graphitization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add the modified asphalt into the melting tank to melt, then transfer to the coating kettle with graphite for coating, use heat conduction oil to heat indirectly, and the coating temperature is controlled at 180 o C. The coating time is 3 hours. After coating, a series of treatments such as screening and graphitization are performed to obtain the final graphite negative electrode material 1, and its indicators are shown in Table 1.

Embodiment 2

[0018] Add the modified asphalt into the melting tank to melt, then transfer to the coating kettle with graphite for coating, use heat conduction oil for indirect heating, and the coating temperature is controlled at 180 o C. The coating time is 3 hours. After coating, a series of treatments such as screening and graphitization are performed to obtain the final graphite negative electrode material 2, and its indicators are shown in Table 1.

Embodiment 3

[0020] Mix the modified asphalt and the modified asphalt at a weight ratio of 75%:25%, put them into the melting tank to melt and dehydrate and stir evenly, use heat conduction oil to indirect heating, and first control the temperature at 250 o C to react for 5 hours, then raise the temperature to 300 o C reacted for 5 hours to obtain a blended asphalt, the blended asphalt moisture o C, volatile matter 58%, coking value 53%.

[0021] Put the obtained blended pitch into a coating kettle equipped with graphite for coating, use heat conduction oil for indirect heating, and control the coating temperature at 180 o C. The coating time is 3 hours. After coating, a series of treatments such as screening and graphitization are performed to obtain the final graphite negative electrode material 3, and its indicators are shown in Table 1.

[0022] The tap density and compaction density of the obtained negative electrode materials are not as high as possible, nor as low as possible. Comp...

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PUM

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Abstract

The invention discloses blend asphalt for coating a graphite anode material. The blend asphalt is prepared from the following components in percentage by weight: 50%-80% of coal asphalt and 20%-50% of petroleum asphalt, the softening point is at the temperature of 110-140 DEG C, the volatile matter is smaller than or equal to 60%, and the coking value is larger than or equal to 40%. The blend asphalt can reduce the volatile matter, increases the coking value and is easy to operate. Meanwhile, by means of the blend asphalt, the qualified rate of granularity of the coated graphite anode material can be increased by 5% or higher, the tap density can be increased by 5%-10%, and the comprehensive performance of the graphite anode material is improved finally.

Description

technical field [0001] The invention relates to a binder used for processing graphite negative electrode materials, in particular to a pitch binder used for coating graphite negative electrode materials and a preparation method thereof. Background technique [0002] Graphite anode material has the advantages of high specific capacity, good cycle performance, high voltage of lithium intercalation and desorption platform, and low cost, and has become the most commercially valuable anode material for power lithium-ion batteries. In the production process of graphite negative electrode materials, pitch is melted as a binder and mixed with carbon materials (coke, graphite powder, etc.), carbonized and graphitized to make graphite negative electrode materials. At the same time, asphalt is also used as a carbon surface-coated graphite material modification treatment agent to modify the pores, grooves, cracks and other defects in the graphite, and improve the electrochemical reversi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00H01M4/62
CPCC08L95/00C08L2205/025H01M4/621Y02E60/10
Inventor 韩峰杨栋梁胡美萍彭渊敏韩少峰
Owner 赣州市瑞富特科技有限公司
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