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Mesophase pitch coke preparation method, mesophase pitch coke, negative electrode material and lithium battery

A mesophase pitch and pitch technology, which is applied in the field of negative electrode materials and lithium batteries, mesophase pitch coke, and mesophase pitch coke, can solve the problem of loss of effective components, low coking value, and low yield of mesophase pitch coke raw materials and other problems, to achieve the effect of improving yield, large operating space, and regular microstructure

Active Publication Date: 2019-11-12
BEIJING RISUN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And there is no introduction about asphalt treatment and impurity control in this patent
In CN 105199766A, medium-temperature pitch is used as raw material. After obtaining mesophase carbon microspheres, the mother liquor is subjected to solvent sedimentation and separation to obtain light-phase pitch. In fact, some effective components are lost, and the yield of the obtained mesophase pitch coke raw material is low. low value

Method used

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  • Mesophase pitch coke preparation method, mesophase pitch coke, negative electrode material and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Choose coal tar medium-temperature pitch with a softening point of 85°C as the raw material, preheat the medium-temperature pitch, glycerol monomethyl ether, and methyl naphthalene oil to 85°C, and mix 100 parts by weight of medium-temperature pitch and 60 parts by weight of methylnaphthalene oil After 30 minutes, the mixed oil of medium temperature asphalt and methyl naphthalene oil was obtained, and then 10 parts by weight of glycerol monomethyl ether was further mixed with the mixed oil of medium temperature asphalt and methyl naphthalene oil in a static mixer, and was heated to 120 ° C, after that Enter the static settling device, and carry out settling and separation under this device. The heavy oil rich in quinoline insolubles is extracted from the bottom, and the refined oil is obtained from the upper part. After heating, the refined bitumen is obtained by distillation. The yield is 94%, and the mixed solvent is obtained. Removal and recovery, the solvent recovery...

Embodiment 2

[0052]Choose coal tar soft asphalt with a softening point of 35°C as the raw material, preheat the soft asphalt, dipropylene glycol (295°C), and dephenolized phenolic oil to 80°C, soft asphalt, dephenolized phenolic oil, and dipropylene glycol The weight ratio of 100:40:8 was stirred and mixed for 30 minutes, heated to 110°C, and the filtrate and filter residue were obtained through a filtration device. After the filtrate was heated, refined pitch was obtained by distillation. The yield was 92%, and the mixed solvent was removed. With recovery, the solvent recovery rate is 99.5%.

[0053] Add ethylene tar to the refined bitumen obtained in the upper part to adjust the kinematic viscosity of the bitumen at 100°C to 800mPa·S. The viscosity-adjusted asphalt is added to the thermal reactor, nitrogen gas is passed through the lower part, preferably the lower part, the reaction pressure is 0.3Mpa, and the temperature is 400 °C for thermal polymerization reaction, and the thermal pol...

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Abstract

The invention provides a mesophase pitch coke preparation method, which comprises: (1) adding an alcohol substance and an aromatic hydrocarbon solvent to coal tar pitch, pre-treating, and removing quinoline insoluble matter to obtain refined asphalt; (2) adding a viscosity adjusting agent to the refined asphalt obtained in the step (1), and adjusting the viscosity to obtain adjusted asphalt; (3) heating the adjusted asphalt obtained in the step (2), and carrying out a thermal polymerization reaction to obtain mesophase asphalt; and (4) carrying out carbonization treatment on the mesophase asphalt obtained in the step (3) to obtain mesophase pitch coke. According to the present invention, the mesophase pitch coke obtained by the preparation method has an ash content of less than or equal to0.1%, a true density of more than or equal to 1.9 and an anisotropy degree of more than or equal to 95%, and the graphitization degree after graphitization can be above 98%. The invention further provides a mesophase pitch coke, a negative electrode material and a lithium battery.

Description

technical field [0001] The invention belongs to the field of chemical industry, and more specifically relates to a preparation method of mesophase pitch coke, mesophase pitch coke, negative electrode material and lithium battery. Background technique [0002] With the intensification of global environmental pollution, governments of all countries have stepped up efforts to control environmental pollution. As one of the chief culprits of environmental pollution, automobile exhaust will undoubtedly receive special attention. Driven by the governments of various countries, the R&D and application of new energy vehicles has become a key development area of ​​the automotive industry. Among them, lithium battery material is the fastest growing new energy material. The negative electrode material has a direct impact on the initial efficiency, cycle performance and safety performance of lithium batteries. The cost of negative electrode materials accounts for about 15%-17% of the c...

Claims

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Application Information

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IPC IPC(8): C10C3/00C10C3/02C10C3/08C10B55/00H01M4/587H01M10/052H01M10/0525
CPCC10B55/00C10C3/00C10C3/002C10C3/02C10C3/08H01M4/587H01M10/052H01M10/0525Y02E60/10
Inventor 庞伟伟党伟荣刘哲陈西波
Owner BEIJING RISUN TECH CO LTD
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