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A kind of preparation method of ultrafine ashless coal for new energy negative electrode

An ash-free coal, new energy technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of narrow distribution range, small particle size, large particle size of coal powder, etc., to improve the effect of impurity removal

Active Publication Date: 2022-07-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the technical problems of high ash content and excessively large coal particle size after the existing pulverized coal is removed, the purpose of the present invention is to provide a method for preparing ultrafine ash-free coal for new energy negative electrodes. Anthracite is de-volatileed in a protective atmosphere and pretreated with ball milling to obtain ultra-fine coal powder with small particle size and narrow distribution range. After impurity removal, the purity of the obtained ultra-fine coal powder is not less than 99.9wt%.

Method used

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  • A kind of preparation method of ultrafine ashless coal for new energy negative electrode
  • A kind of preparation method of ultrafine ashless coal for new energy negative electrode
  • A kind of preparation method of ultrafine ashless coal for new energy negative electrode

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Effect test

Embodiment 1

[0039] The anthracite was initially crushed to -200 mesh, placed in a corundum crucible, and kept in a muffle furnace at 600 °C for 8 hours in a nitrogen atmosphere to remove volatiles.

[0040] Take 30g of devolatilized pulverized coal, add it to the zirconia ball mill, add 10ml of anhydrous ethanol to the ball mill, choose zirconia balls as medium balls, and control the gradation of medium balls as medium balls: small balls = 1:1, Ball-to-material ratio = 10:1, planetary ball mill rotation speed 300r / min, ball milling time 12h, after drying in a vacuum drying box for 4h, ultra-fine pulverized coal with good dispersibility was obtained, and the particle size of the pulverized coal was measured by a laser particle size tester distribution, such as figure 1 As shown, D50=0.855 μm, D90=1.609 μm.

[0041] Mix ultrafine coal powder and NaOH at a mass ratio of 0.6:1.0, add 130 g of deionized water and 10 wt% ethanol (NaOH concentration is 4.0 mol / L), and then soak in hydrothermal ...

Embodiment 2

[0043] The anthracite was initially crushed to -200 mesh, placed in a corundum crucible, and kept in a muffle furnace at 650 °C for 4 hours in a nitrogen atmosphere to remove volatiles.

[0044] Take 30g of devolatilized pulverized coal, add it to the zirconia ball mill, add 10ml of anhydrous ethanol to the ball mill, choose zirconia balls as medium balls, and control the gradation of medium balls as medium balls: small balls = 1:1, Ball-to-material ratio = 5:1, planetary ball mill rotation speed 300r / min, ball milling time 10h, after drying in a vacuum drying box for 4h, ultra-fine pulverized coal with good dispersibility was obtained, and the particle size of the pulverized coal was measured by a laser particle size tester distribution, such as figure 2 As shown, D50=1.592 μm, D90=2.889 μm.

[0045] Mix ultrafine coal powder and NaOH at a mass ratio of 0.8:1.0, add 130 g of deionized water and 10 wt% of ethanol (NaOH concentration is 5.0 mol / L), then soak in hydrothermal a...

Embodiment 3

[0047] The anthracite was initially crushed to -200 mesh, placed in a corundum crucible, and kept in a muffle furnace at 650 °C for 4 hours in a nitrogen atmosphere to remove volatiles.

[0048] Take 30g of devolatilized pulverized coal, add it to the zirconia ball mill, add 10ml of anhydrous ethanol to the ball mill, choose zirconia balls as the medium ball, and control the gradation of medium balls as medium balls: small balls = 1:2, Ball-to-material ratio = 10:1, planetary ball mill rotation speed 300r / min, ball milling time 8h, after drying in a vacuum drying box for 4h, ultra-fine pulverized coal with good dispersibility was obtained, and the particle size of the pulverized coal was measured by a laser particle size tester distribution, such as image 3 As shown, D50=1.536 μm, D90=2.937 μm.

[0049] Mix ultrafine coal powder and NaOH at a mass ratio of 0.6:1.0, add 130 g of deionized water and 10 wt% ethanol (NaOH concentration is 4.0 mol / L), and then soak in hydrotherma...

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Abstract

The invention discloses a method for preparing ultrafine ashless coal for new energy negative electrode, comprising the following steps: (1) crushing the anthracite and roasting it in a protective atmosphere to obtain coal particles; adding dispersed coal to the obtained coal particles (2) After mixing the ultra-fine coal powder, alkali and surfactant, after hydrothermal leaching, filtering, washing and drying to obtain alkali-soluble coal; (3) Add alkali-soluble coal into the mixed leaching solution of acid and fluoride salt, filter, wash and dry after heating and leaching to obtain ultrafine ashless coal powder. The invention can obtain ultrafine coal powder with small particle size and narrow distribution interval by removing volatiles from the crushed anthracite in a protective atmosphere and cooperating with ball milling pretreatment, and after removing impurities, the purity of the obtained ultrafine coal powder Not less than 99.9wt%.

Description

technical field [0001] The invention relates to a preparation method of ultrafine ashless coal for new energy negative electrode, and belongs to the technical field of preparation of functional carbon powder materials. Background technique [0002] As an emerging industry, new energy materials have ushered in explosive growth with the continuous increase in the state's supportive policies for the new energy industry in recent years. Energy storage and conversion devices determine the key to the development of the new energy industry, and the key to energy storage and conversion devices lies in materials. In recent years, the improvement of the performance of lithium-ion batteries is also mainly attributed to the substantial improvement of the performance of carbon anode materials. At present, coal-based carbon materials have abundant raw material sources and low cost. If coal-based carbon materials for lithium-ion battery anodes can be researched and developed to replace th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525
CPCH01M4/362H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 肖劲唐雷仲奇凡王志安
Owner CENT SOUTH UNIV
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