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A method for preparing negative electrode material by dry distillation of coal tar at medium and low temperature

A negative electrode material, coal tar technology, applied in chemical instruments and methods, battery electrodes, carbon compounds, etc., can solve the problems of waste of chemical resources and low value, and achieve the effect of efficient use of energy, easy operation and stable performance

Active Publication Date: 2021-03-05
SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic manufacturers generally sell it directly as fuel oil, which is cheap, and the value of the excess is not high, and it is a serious waste of chemical resources

Method used

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  • A method for preparing negative electrode material by dry distillation of coal tar at medium and low temperature
  • A method for preparing negative electrode material by dry distillation of coal tar at medium and low temperature
  • A method for preparing negative electrode material by dry distillation of coal tar at medium and low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Put the medium and low temperature carbonized coal tar pitch in the reaction kettle, raise the temperature under normal pressure and cut off the fraction before 300°C, and the gas phase can reach up to 320°C. Heating was stopped, the temperature was lowered, and light components and heavy components were obtained by separation.

[0058] Light components can be sold as high value-added products such as raw materials for producing clean fuel oil and octane adjustment for gas and diesel.

[0059] The quinoline insoluble content of the heavy component is 0.55% according to the analysis of the national standard. It is directly used as the raw material for the preparation of the negative electrode material precursor and put into the small coking tower for carbonization reaction. The heating rate is 15°C / min to 500°C, and the carbonization occurs at the same time The gas is discharged through the vent valve, and the pressure is kept not exceeding 2MPa until the carbonization i...

Embodiment 2

[0061] Put the medium and low temperature dry distillation coal tar pitch in the reaction kettle, carry out vacuum distillation under the vacuum degree of 0.07MPa, raise the temperature and cut off the distillate before 250°C, and the gas phase can reach up to 260°C. Heating was stopped, the temperature was lowered, and light components and heavy components were obtained by separation.

[0062] Light components can be sold as high value-added products such as raw materials for producing clean fuel oil and octane adjustment for gas and diesel.

[0063] The heavy components were loaded into the reactor, and polymerized under normal pressure, the temperature was raised to 430°C at 4°C / min, and the temperature was kept constant for 14h to obtain the raw material of the negative electrode material precursor. According to the national standard analysis, the content of quinoline insolubles is 4.64%. It is directly used as the raw material prepared by the negative electrode material p...

Embodiment 3

[0065] Put the medium and low temperature dry distillation coal tar pitch in the reaction kettle, carry out vacuum distillation under the vacuum degree of 0.07MPa, raise the temperature and cut off the distillate before 250°C, and the gas phase can reach up to 260°C. Heating was stopped, the temperature was lowered, and light components and heavy components were obtained by separation.

[0066] Light components can be sold as high value-added products such as raw materials for producing clean fuel oil and octane adjustment for gas and diesel.

[0067] The heavy components were loaded into the reactor, and polymerized under normal pressure, the temperature was raised to 435°C at 6°C / min, and the temperature was kept constant for 14h to obtain the raw material of the negative electrode material precursor. According to the national standard analysis, the content of quinoline insolubles is 10.34%. It is directly used as the raw material prepared by the negative electrode material ...

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Abstract

The invention provides a method for preparing a negative electrode material by using medium and low temperature dry distillation coal tar. The medium and low temperature coal tar is used as a raw material, and the negative electrode is controlled by adjusting the content of quinoline insoluble matter, carbonization conditions, and graphitization conditions in the negative electrode material precursor preparation raw material. The structure of the material is used to prepare the negative electrode material. Compared with the existing technology, the beneficial effects of the present invention are: 1) The negative electrode material prepared by the present invention has high charging and discharging efficiency of the battery for the first time, stable battery performance, excellent cycle performance, outstanding anti-attenuation ability, and a gram specific capacity of up to 360mAh above. 2) The process method of the present invention is simple and feasible, easy to realize industrial production, provides a new way for the deep processing of medium and low temperature dry distillation coal tar, and significantly improves the added value of medium and low temperature dry distillation coal tar. 3) Conform to the country's call for efficient use of energy and alleviate the energy shortage.

Description

technical field [0001] The invention relates to the technical field of production of negative electrode materials, in particular to a method for preparing negative electrode materials by dry distillation of coal tar at a medium and low temperature. Background technique [0002] With the depletion of fossil fuels and the gradual deterioration of the environment, there is an urgent need for environmentally friendly renewable energy to replace the traditional fossil energy that is currently being used on a large scale. In order to realize the energy storage and conversion technology of renewable energy, the lithium-ion battery system The representative chemical energy storage technology has attracted more and more researchers' attention because of its high energy density, environmental friendliness, high safety, long cycle life, no memory effect, small size, light weight, high specific capacity, and structural Excellent features such as diversification and low price have been w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/205H01M4/587H01M10/0525
CPCC01B32/205H01M4/587H01M10/0525Y02E60/10
Inventor 陈雪武全宇李强生刘书林张勇孙刚屈滨
Owner SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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