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Lithium ion battery negative electrode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, which can be applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., and can solve problems such as harming the ecological environment.

Active Publication Date: 2021-12-24
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The removed coal tar pitch quinoline insoluble matter is a kind of chemical waste, which seriously endangers the ecological environment

Method used

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  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] a) Add 25g of coal tar pitch and 50g of washing oil kerosene mixed solvent (solvent ratio: 2:1) into the reaction kettle, pressurize to 1.0MPa after nitrogen purging, heat up to 130°C, and then mechanically Stir for 1h, maintain the temperature and pressure and let it settle for 4h, then take out the residue at the bottom of the reaction kettle to obtain coal tar pitch quinoline insoluble matter;

[0055] b) Add coal tar pitch quinoline insolubles in quinoline solution, utilize quinoline solution to disperse ultrasonically under heating conditions, after fully washing, place in a 50ml centrifuge tube, centrifuge at 4000R / min for 30min, collect the centrifuge tube solid;

[0056] c) The collected solid was washed four times with quinoline solution and toluene solution while hot, and placed in an oven at 120°C to remove residual solvent;

[0057] d) Grind the washed solid and KOH uniformly at a ratio of 1:1, place it in a tube furnace, and activate it at 700°C under a ni...

Embodiment 2

[0062] a) Add 25g of coal tar pitch and 50g of washing oil kerosene mixed solvent with a ratio of 0.4 to aromatic resin (solvent ratio is 2:1) into the reaction kettle, pressurize to 1.0Mpa after purging with nitrogen, heat up to 130°C and then mechanically Stir for 1h, maintain the temperature and pressure and let it settle for 4h, then take out the residue at the bottom of the reaction kettle to obtain coal tar pitch quinoline insoluble matter;

[0063] b) Add coal tar pitch quinoline insolubles in quinoline solution, utilize quinoline solution to disperse ultrasonically under heating conditions, after fully washing, place in a 50ml centrifuge tube, centrifuge at 4000R / min for 30min, collect the centrifuge tube solid;

[0064] c) The collected solid was washed four times with quinoline solution and toluene solution while hot, and placed in an oven at 120°C to remove residual solvent;

[0065] d) Grind the washed solid and KOH uniformly at a ratio of 1:3, place it in a tube ...

Embodiment 3

[0070] a) Add 25g of coal tar pitch and 50g of washing oil kerosene mixed solvent with a ratio of 0.4 to aromatic resin (solvent ratio is 2:1) into the reaction kettle, pressurize to 1.0Mpa after purging with nitrogen, heat up to 130°C and then mechanically Stir for 1h, maintain the temperature and pressure and let it settle for 4h, then take out the residue at the bottom of the reaction kettle to obtain coal tar pitch quinoline insoluble matter;

[0071] b) Add coal tar pitch quinoline insolubles in quinoline solution, utilize quinoline solution to disperse ultrasonically under heating conditions, after fully washing, place in a 50ml centrifuge tube, centrifuge at 4000R / min for 30min, collect the centrifuge tube solid;

[0072] c) The collected solid was washed four times with quinoline solution and toluene solution while hot, and placed in an oven at 120°C to remove residual solvent;

[0073] d) Grind the washed solid and KOH uniformly at a ratio of 1:3, place it in a tube ...

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Abstract

The invention provides a lithium ion battery negative electrode material and a preparation method thereof. The preparation method comprises the following steps: mixing coal tar pitch with a solvent which is a mixed solvent consisting of kerosene, absorber oil or anthracene oil in a certain proportion, conducting stirring at a certain temperature and pressure, and conducting standing and settling to obtain a coal tar pitch quinoline insoluble substance; mixing the coal tar pitch quinoline insoluble substances with a quinoline solution, performing centrifugal separation, and collecting solids; sequentially washing the solid with a quinoline solution and a toluene solution which are heated to 70 DEG C, and conducting drying; mixing the dried solid with KOH according to a certain proportion, conducting grinding, and conducting activating in a furnace under the protection of inert gas; and washing the activated product with an acid solution and water until the product is neutral, and conducting drying to obtain the lithium ion battery negative electrode material. The preparation method has the advantages of environmental friendliness, no pollution, simplicity in operation, low raw material price and excellent property of the battery negative electrode material.

Description

technical field [0001] The invention belongs to the reutilization of coal waste processing carbon materials, in particular to a method for preparing carbonaceous lithium ion battery negative electrode materials by activating coal tar pitch quinoline insolubles with KOH. Background technique [0002] At present, the research on lithium battery anode materials at home and abroad has been relatively in-depth. There are mainly two types of carbon materials such as carbon microspheres and petroleum coke, and non-carbon materials such as tin-based materials and silicon-based materials. However, the preparation process of these materials is very complicated and the preparation cost is very high. [0003] In the process of mesophase conversion of coal tar pitch into needle coke, quinoline insolubles can be adsorbed on the surface of mesophase spheres, which reduces the activation energy of the reaction during the formation of mesophase pitch and promotes the nucleation of mesophase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/33H01M4/587H01M10/0525
CPCC01B32/348C01B32/33H01M4/587H01M10/0525Y02E60/10
Inventor 林雄超王彩红张玉坤王永刚
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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