Amorphous carbon coated graphite composite, preparation method thereof and application of amorphous carbon coated graphite composite serving as lithium ion battery cathode material

A composite material, amorphous carbon technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of poor electrochemical performance of amorphous carbon-coated CMS particles, large irreversible capacity and low gram capacity of amorphous carbon materials. and other problems, to achieve the effect of being conducive to rapid diffusion, improving preparation quality and efficiency, and good compatibility

Active Publication Date: 2016-04-27
JIAOZUO JUNENG ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relatively speaking, graphite materials only form a layer of SEI film on the surface of the material, but amorphous carbon materials not only form SEI films on the surface, but also generate SEI films in the micropores, so the irreversible capacity of amorphous carbon materials is relatively large
This is also the reason for the poor electrochemical performance and low gram capacity of the above-mentioned amorphous carbon-coated CMS particles.

Method used

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  • Amorphous carbon coated graphite composite, preparation method thereof and application of amorphous carbon coated graphite composite serving as lithium ion battery cathode material
  • Amorphous carbon coated graphite composite, preparation method thereof and application of amorphous carbon coated graphite composite serving as lithium ion battery cathode material
  • Amorphous carbon coated graphite composite, preparation method thereof and application of amorphous carbon coated graphite composite serving as lithium ion battery cathode material

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Experimental program
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Effect test

Embodiment 1

[0041] The amorphous carbon-coated graphite composite material of the present embodiment is prepared by a method comprising the following steps:

[0042] 1) According to the mass ratio of calcium carbonate (template agent) to acrylonitrile monomer of 1:10, take 1.0g of calcium carbonate and 10.0g of acrylonitrile monomer and mix and stir evenly, then add 50g of potassium persulfate and 300g of secondary Distilled water (mass ratio of acrylonitrile monomer, initiator to water: 10:50:300), under nitrogen atmosphere, heat to 60°C and keep warm for 5h to carry out polymerization reaction to polymerize the monomer. After the reaction is completed, cool, wash and dry , to obtain template agent / polyacrylonitrile composite material;

[0043] According to the ratio of graphite, emulsifier and water mass ratio of 1:2:80, put 1.0g of artificial graphite into a three-necked flask, add 80g of distilled water, 2.0g of emulsifier NP9, and ultrasonically disperse for 30min under mechanical st...

Embodiment 2

[0048] The amorphous carbon-coated graphite composite material of the present embodiment is prepared by a method comprising the following steps:

[0049] 1) According to the mass ratio of calcium carbonate (template agent) to acrylonitrile monomer of 1:8, take 1.0g of calcium carbonate and 8.0g of acrylonitrile monomer and mix them evenly, then add 40g of potassium persulfate and 200g of secondary Distilled water (mass ratio of acrylonitrile monomer, initiator to water: 8:40:200), under nitrogen atmosphere, heat to 40°C and keep warm for 10h to carry out polymerization reaction to polymerize the monomer. After the reaction is completed, cool, wash and dry , to obtain template agent / polyacrylonitrile composite material;

[0050] According to the ratio of graphite, emulsifier and water mass ratio of 1:1.5:50, put 1.0g of artificial graphite into a three-necked flask, add 50g of distilled water, 1.5g of emulsifier NP9, and ultrasonically disperse for 30min under mechanical stirri...

Embodiment 3

[0055] The amorphous carbon-coated graphite composite material of the present embodiment is prepared by a method comprising the following steps:

[0056] 1) According to the mass ratio of calcium carbonate (template agent) to acrylonitrile monomer of 1:12, take 1.0g of calcium carbonate and 12.0g of acrylonitrile monomer and mix them evenly, then add 60g of potassium persulfate and 500g of secondary Distilled water (mass ratio of acrylonitrile monomer, initiator to water: 12:60:500), under nitrogen atmosphere, heat to 90°C and keep warm for 1h to carry out polymerization reaction to polymerize the monomer. After the reaction is completed, cool, wash and dry , to obtain template agent / polyacrylonitrile composite material;

[0057] According to the ratio of graphite, emulsifier and water mass ratio of 1:2.5:100, put 1.0g of artificial graphite into a three-necked flask, add 100g of distilled water, 2.5g of emulsifier NP9, and ultrasonically disperse for 30min under mechanical st...

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Abstract

The invention discloses an amorphous carbon coated graphite composite, a preparation method thereof and application of the amorphous carbon coated graphite composite serving as a lithium ion battery cathode material. The preparation method of the composite includes mixing template with acrylonitrile monomers, and adding initiator and water for polymerization reaction to obtain a template/polyacrylonitrile composite; dispersing graphite and emulsifier in water to obtain a graphite compound; adding the template/polyacrylonitrile composite into the graphite compound for emulsion reaction, adding acid liquor for etching to remove the template to obtain a porous polyacrylonitrile/graphite composite, soaking the porous polyacrylonitrile/graphite composite in lithium liquor, and drying and splitting the porous polyacrylonitrile/graphite composite after taking out the same from the lithium liquor to obtain the amorphous carbon coated graphite composite. The amorphous carbon coated graphite composite has the advantages of large interlayer spacing, excellent low-temperature performance, high liquid absorbing and retaining ability, high gram volume and the like; lithium is stored in micropores in advance, so that lithium consumption in lithium ion batteries is reduced, first-time reversible capacity of the lithium ion batteries is reduced, and specific capacity of the lithium ion batteries is increased.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials, and specifically relates to an amorphous carbon-coated graphite composite material, and also relates to a preparation method of the amorphous carbon-coated graphite composite material and its application as a negative electrode material of a lithium ion battery. Background technique [0002] As a new type of chemical power source, lithium-ion batteries have outstanding advantages such as high working voltage, large specific energy, stable discharge potential curve, small self-discharge, long cycle life, good low-temperature performance, no memory, and no pollution. Due to the dual requirements of small size, light weight and environmental protection, the batteries required for portable appliances are widely used in small electronic devices such as mobile communications and notebook computers, and are also ideal power sources for future electric vehicles. [0003] As the main ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/366H01M4/583H01M10/0525Y02E60/10
Inventor 和百正和明刚和喆田二强
Owner JIAOZUO JUNENG ENERGY TECH
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