Carbon material for negative electrode of lithium ion battery and preparation method thereof, negative electrode of lithium ion battery, and lithium ion battery

A lithium-ion battery and carbon material technology, applied in battery electrodes, carbon preparation/purification, secondary batteries, etc., can solve the problems of not fully exploiting the utilization value of coal direct liquefaction residue, achieve excellent rate performance and improve rate performance , the effect of good cycle stability

Active Publication Date: 2017-03-08
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since it only uses coal direct liquefaction residue as a coating agent, the utilization value of coal direct liquefaction residue has not been fully developed

Method used

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  • Carbon material for negative electrode of lithium ion battery and preparation method thereof, negative electrode of lithium ion battery, and lithium ion battery
  • Carbon material for negative electrode of lithium ion battery and preparation method thereof, negative electrode of lithium ion battery, and lithium ion battery

Examples

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preparation example Construction

[0017] The invention provides a method for preparing a carbon material used for the negative electrode of a lithium ion battery, the method comprising: (1) thermally polymerizing coal direct liquefaction residue and / or coal tar pitch to obtain a thermally polymerized product; (2) Stabilizing the thermal polymerization product to obtain a stabilized product; (3) pre-calcining the stabilized product and ball milling the calcined product to obtain a carbide; (4) carbonizing the carbide, obtain a carbon material; wherein, before performing the pre-calcination in step (3), the stabilized product is mixed with a hard carbon precursor, or the stabilized product is mixed with an organic solution of the hard carbon precursor and Remove the organic solvent; and / or, before carrying out the carbonization in step (4), the substance to be carbide is mixed with the hard carbon precursor, or the stabilized product is mixed with the organic solution of the hard carbon precursor And remove the ...

Embodiment 1

[0050] This example is used to illustrate the preparation method of the carbon material used for the negative electrode of the lithium ion battery provided by the present invention and the negative electrode of the lithium ion battery.

[0051] 1) Purify the residue of direct coal liquefaction (containing 20% ​​by weight of ash, produced by direct coal liquefaction of Shenhua Group, and the rest of the examples are the same) (to obtain coal liquefaction pitch, containing 91.19% by weight of carbon, 5.65% by weight of hydrogen, and an average molecular weight of 500, the softening point is 150°C, the ash content is less than 200ppm, and the rest of the examples are the same), after being crushed (the particle size is <5mm), put it into the polymerization reactor for thermal polymerization, the thermal polymerization temperature is 400°C, and the time is 8h to obtain thermal polymerization product;

[0052] Crush the thermal polymerization product, grind it finely in an agate mo...

Embodiment 2

[0060] This example is used to illustrate the preparation method of the carbon material used for the negative electrode of the lithium ion battery provided by the present invention and the negative electrode of the lithium ion battery.

[0061] 1) After the coal tar pitch is crushed (with a particle size of <5 mm), it is put into a polymerization reactor for thermal polymerization. The thermal polymerization temperature is 390° C. and the time is 9 hours to obtain a thermal polymerization product;

[0062] Break the thermal polymerization product, grind it in an agate mortar, and sieve it with a 0.5mm sieve to obtain a thermal polymerization product below 0.5mm, weigh 50g and spread it on a tray, place it in a stabilizing furnace, and pass it into Air, adjust the flow rate to 4m 3 / h, after heating to 240°C, keep the temperature for 10h to obtain a stabilized product;

[0063] 10g of the stabilized product was pre-calcined at 800°C for 3 hours, and the pre-calcined product wa...

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Abstract

The invention provides a carbon material for a negative electrode of a lithium ion battery and a preparation method thereof, the negative electrode of the lithium ion battery, and the lithium ion battery. The method comprises the following steps: (1) subjecting residues of direct coal liquefaction and/or coal-tar pitch to thermopolymerization so as to obtain a thermopolymerization product; (2) stabilizing the thermopolymerization product so as to obtain a stabilized product; (3) pre-sintering the stabilized product and subjecting the pre-sintered product to ball milling so as to obtain a to-be-carbonized substance; and (4) carbonizing the to-be-carbonized substance so as to obtain the carbon material; wherein a hard carbon precursor or an organic solution of the hard carbon precursor is added in the step (3) and/or the step (4). The method can realize high-added-value utilization of the residues of direct coal liquefaction and prepares the carbon material with higher rate performance for the negative electrode of the lithium ion battery at low cost in virtue of simple process.

Description

technical field [0001] The invention provides a carbon material used for a lithium ion battery negative pole and a preparation method thereof, a lithium ion battery negative pole containing the carbon material used for a lithium ion battery negative pole, and a lithium ion battery containing the lithium ion battery negative pole. Background technique [0002] Anode materials are one of the key materials for lithium-ion batteries. Carbon materials were the first anode materials that people began to study and applied to lithium-ion batteries. The main carbon materials currently used as negative electrode materials include natural graphite, artificial graphite, mesocarbon microspheres, soft carbon and hard carbon. Among them, hard carbon is carbon that is extremely difficult to graphitize at very high temperatures (>2800°C), so it is called hard carbon, and soft carbon is carbon that is relatively easy to graphitize. Soft carbon and hard carbon are generally amorphous carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/0525C01B32/05
CPCH01M4/587H01M10/0525Y02E60/10
Inventor 唐堃潘广宏刘均庆郑冬芳何广利张开周宫晓颐王宪宏薛嘉渔
Owner CHNA ENERGY INVESTMENT CORP LTD
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