Carbon negative electrode material precursor and preparation method and application thereof, and carbon negative electrode material and preparation method and application thereof

A carbon negative electrode material and precursor technology, applied in the field of lithium-ion batteries, can solve problems such as high thermal expansion coefficient, low porosity, and shortage of raw materials, and achieve the effects of simple preparation process, short process, and reduced production costs

Active Publication Date: 2020-10-16
山西沁新能源集团股份有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a carbon negative electrode material precursor and its preparation in order to overcome the problems of difficult graphitization, high thermal expansion coefficient and low porosity in the carbon negative electrode material precursor in the prior art, as well as the shortage of raw materials and high cost. Method and application, a carbon negative electrode material and its preparation method and application

Method used

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  • Carbon negative electrode material precursor and preparation method and application thereof, and carbon negative electrode material and preparation method and application thereof
  • Carbon negative electrode material precursor and preparation method and application thereof, and carbon negative electrode material and preparation method and application thereof
  • Carbon negative electrode material precursor and preparation method and application thereof, and carbon negative electrode material and preparation method and application thereof

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Embodiment approach

[0024] In a preferred embodiment, the high-rank bituminous coal is high-rank coking coal and lean coal, wherein the weight ratio of high-rank coking coal and lean coal is 20-50:5-15.

[0025] In the present invention, the high-order bituminous coal has a high degree of metamorphism, aromaticity and condensation, and the carbon atomic layer has a certain bonding performance. The carbonization process can gradually become coke, and the pores of the precursor can be improved through the slow carbonization process. The structure is improved.

[0026] In the present invention, unless otherwise specified, the TI refers to the toluene-insoluble components in coal tar pitch and / or other similar products, and the QI refers to the quinoline insoluble matter.

[0027] Preferably, the parameters of the coal-based binder meet: ash content40%, TI content>25wt%, QI content 100°C, moisture content of 5-10wt%; further preferably, the base binder is pitch, preferably selected from coal tar hig...

Embodiment 1

[0068] (1) 95% of the pulverized coal A and coal B are particles with a particle size <1.5mm, 95% are pulverized pitch coke particles with a particle size <1mm, and 90% are pulverized high-temperature pitch particles with a particle size <3mm %, described additive H-1 comprises the graphitization catalyst of 30wt% and the carbon pore modifier of 70wt%, wherein, the weight ratio of aluminosilicate, iron powder and silicon carbide in the graphitization catalyst is 10:5: 85, the weight ratio of potassium nitrate and calcium nitrate in the carbon pore modifier is 80:20;

[0069] (2) Mix and shape the pulverized coal A, coal B, pitch coke and high-temperature pitch with additive H-1 to obtain a cake, wherein the weight ratio of coal A to coal B is 25:14.5;

[0070] (3) Heat treatment, cooling, and sizing of the material cake to obtain a carbon negative electrode material precursor S1, wherein the heat treatment includes a first stage, a second stage, a third stage, and a fourth sta...

Embodiment 2

[0072] (1) 92% of pulverized coal A and coal B with particle size <1.5mm, 95% of pulverized pitch coke with particle size <1mm, and 90% of pulverized high-temperature asphalt with particle size <3mm %, described additive H-2 comprises the graphitization catalyst of 50wt% and the carbon pore modifier of 50wt%, wherein, the weight ratio of aluminosilicate, iron powder and silicon carbide in the graphitization catalyst is 15:5: 80, the weight ratio of potassium nitrate and calcium nitrate in the carbon pore modifier is 90:10;

[0073] (2) Mix and shape the crushed A coal, B coal, pitch coke and high-temperature pitch with additive H-2 to obtain a material cake, wherein the weight ratio of A coal to B coal is 30:10;

[0074] (3) The cake is subjected to heat treatment, cooling, and granulation to obtain a carbon negative electrode material precursor S2, wherein the heat treatment includes a first stage, a second stage, a third stage, and a fourth stage.

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a carbon negative electrode material precursor and a preparation method and application thereof, and a carbon negative electrode material and a preparation method and application thereof. Wherein the carbon negative electrode material precursor is obtained by carrying out heat treatment on a mixture of high-order bituminous coal, a coal-based binder, a coal-based inert agent and an additive; wherein the high-order bituminous coal is bituminous coal of which the vitrinite average reflectivity is greater than1.3%, and the high-order bituminous coal is selected from high-order coking coal and/or lean coal. The high-order bituminous coal, the coal-based binder and the coal-based inert agent which are widein source and low in price are adopted, on one hand, the carbon source of the precursor is expanded, and the production cost is reduced; meanwhile, due to the addition of the additive, the pore structure of the precursor is effectively improved, and the electrochemical performance of the carbon negative electrode material prepared from the precursor is further improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a carbon negative electrode material precursor and its preparation method and application, a carbon negative electrode material and its preparation method and application. Background technique [0002] The most widely used battery negative electrode material is graphitized carbon material. Among graphitized carbon negative electrode materials, artificial graphite has a high cycle life and good rate performance, and is mostly used in power lithium batteries. The raw materials for the production of carbon anode materials from artificial graphite are mostly high-end carbon materials such as needle coke and mesophase carbon microspheres. These raw materials are in short supply at home and abroad, and the market is in short supply. The cost is high and the quality varies widely. . Relying on outsourcing such raw materials to produce anode materials has resulted in high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/622C04B38/06H01M4/587H01M10/0525
CPCC04B38/068C04B35/522C04B35/622H01M4/587H01M10/0525H01M2004/027C04B2235/9607C04B38/0074C04B38/0054Y02E60/10
Inventor 张留峰郭培瑞唐杰孙占龙杨生斌徐秀丽唐帅
Owner 山西沁新能源集团股份有限公司
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