Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Purification method of graphite in waste residues of artificial diamond production, graphite anode material for lithium ion battery and preparation method of graphite anode material

A synthetic diamond, lithium-ion battery technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of serious equipment corrosion, high reaction temperature, increased production costs, etc., to achieve reduced corrosion degree, high recovery rate, Energy saving effect

Inactive Publication Date: 2019-04-26
河南烯碳合成材料有限公司
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction temperature is too high, which seriously corrodes the equipment and increases the production cost.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Purification method of graphite in waste residues of artificial diamond production, graphite anode material for lithium ion battery and preparation method of graphite anode material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] The preparation method of graphite negative electrode material for lithium ion battery of the present invention comprises the following steps: 1) mixing artificial diamond production waste slag with inorganic acid, and reacting at 80-120°C for 24-36h; the inorganic acid is concentrated sulfuric acid, concentrated nitric acid , at least one of concentrated hydrochloric acid; 2) the solid-liquid separation of the system after the reaction in step 1), washing and drying, to obtain purified graphite; 3) the purified graphite obtained in step 2) is mixed with a pyrolytic carbon source, impregnated, Carbonization, that is.

[0036] Step 1) The concentration of hydrogen ions in the inorganic acid is 12-36.8 mol / L.

[0037] The washing in step 2) is to wash the solid after solid-liquid separation until the filtrate is neutral. In step 2), the drying temperature is 110-300° C., and the drying time is 2-4 hours.

[0038] The pyrolysis carbon source in step 3) is pitch, and the ...

Embodiment 1

[0043] The purification method of the present embodiment comprises the following steps:

[0044] (1) Put 20kg of artificial diamond production waste residue (water content 50%) into a ball mill for ball milling, then pass through a 120-groove bed shaker, remove most of the artificial diamond and metal, repeat suction filtration twice, and wash with deionized water , and then baked at 150°C for 3 hours to obtain a total of 9.5kg of graphite powder;

[0045] (2) the graphite powder that step (1) is obtained is put into crushing spheroidization equipment (FNMZ-4122 type crushing spheroidization production line) and carries out spheroidization process, obtains D50 and is 5.7kg of spherical graphite of 16.09 μ m;

[0046] (3) Get the spherical graphite 2.7kg that step (2) obtains and add in the reactor, add 10L concentrated hydrochloric acid (mass fraction is 37.5%, density is 1.179g / cm 3 , the hydrogen ion concentration is 12mol / L), stirred and reacted at 120°C for 24h, and the sti...

Embodiment 2

[0048] The purification method of the present embodiment comprises the following steps:

[0049] (1) Put 20kg of artificial diamond production waste residue (water content 50%) into a ball mill for ball milling, then pass through a 120-groove bed shaker, remove most of the artificial diamond and metal, repeat suction filtration twice, and wash with deionized water , and then baked at 150°C for 3 hours to obtain a total of 9.4kg of graphite powder;

[0050] (2) the graphite powder that step (1) obtains is put into crushing spheroidization equipment (FNMZ-4122 type crushing spheroidization production line) and carries out spheroidization process, obtains D50 and is 5.9kg of spherical graphite of 16.28 μ m;

[0051] (3) Get 3kg of spherical graphite obtained in step (2) and add in the reactor, add 3L of concentrated sulfuric acid, 1.5L of concentrated hydrochloric acid and 0.5L of concentrated nitric acid, stir and react at 120°C for 24h, and the stirring rate is 200 rpm; After ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
softening pointaaaaaaaaaa
densityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of graphite materials, and particularly relates to a purification method of graphite in waste residues of artificial diamond production, a graphite anode material for a lithium ion battery and a preparation method of the graphite anode material. The purification method of graphite in the waste residues of the artificial diamond production comprises following steps: (1), the waste residues of the artificial diamond production and inorganic acid are mixed and subjected to a reaction for 24-36 h at 80-120 DEG C; inorganic acid is at least one of concentrated sulfuric acid, concentrated nitric acid and concentrated hydrochloric acid; (2), a system obtained after a reaction in step (1) is subjected to solid-liquid separation, washed and dried. The purification method of graphite is high in recovery rate and low in production cost. When modified graphite obtained through asphalt coating modification of the graphite purified with the purification method is taken as the anode material for the lithium ion battery, the modified graphite has better cycling stability.

Description

technical field [0001] The invention belongs to the technical field of graphite materials, and in particular relates to a method for purifying graphite in artificial diamond production waste slag, a graphite negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] In the past two decades, my country's synthetic diamond industry has developed rapidly, and synthetic diamond, as a new material, plays an increasingly important role in the national economy. According to relevant statistics, my country's current annual output of synthetic diamonds has reached 3 billion carats, and it has entered the forefront of the world's largest production countries. Based on the above data, it is conservatively estimated that no less than 16,000 tons of carbon sheets and catalyst alloy sheets will enter the press to produce synthetic diamonds in the form of assembled synthetic blocks each year. The ratio of carbon flakes converted i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/215H01M4/38H01M10/0525
CPCC01B32/215H01M4/38H01M10/0525H01M2004/027Y02E60/10
Inventor 刘明举王海超臧波张冕张素爽王云超陈龙李亚举李广霞
Owner 河南烯碳合成材料有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com