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Rapid-charge microcrystalline graphite negative electrode material and production method thereof

A technology of microcrystalline graphite and negative electrode materials, applied in the direction of negative electrodes, chemical instruments and methods, battery electrodes, etc., can solve the problems that the yield of powder making is difficult to exceed 40%, high production costs, and poor circulation of natural graphite, etc., to achieve Excellent fast charging performance and cycle performance, low production cost, and small specific surface area

Active Publication Date: 2019-11-01
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to realize the 10C fast charge of graphite negative electrode, the patents [JP10294111] and [CN105024043A] both use natural graphite as raw material, and improve the fast charge performance of graphite negative electrode by coating and granulation respectively, but the cycle performance of natural graphite itself is Not as good as artificial graphite, so its scope of application is small
Patent [CN106981632A] uses pitch coke or petroleum coke as raw materials, and obtains a fast-filling graphite negative electrode material by first granulating and then coating. This material also avoids the problem of poor circulation of natural graphite. However, this process step Complicated, high production cost, only suitable for high-end lithium-ion batteries
[0006] The strength of microcrystalline graphite is low, and it is easy to produce a large amount of fine powder during mechanical processing. The yield of powder making is difficult to exceed 40%, and about 60% of the fine powder produced will be disposed of as waste solids

Method used

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  • Rapid-charge microcrystalline graphite negative electrode material and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Microcrystalline graphite waste with a degree of graphitization of 93.2% and petroleum pitch (particle size 4.8 μm) with a softening point of 120° C. were mixed with VC machinery at a ratio of 10:3.

[0042] The mixed material was transferred into a vertical kettle, and composite granulated at 400° C. in a nitrogen atmosphere. The rotation speed of the material in the granulation equipment was 90 rpm, and the granulation time was 3 hours to obtain composite granules.

[0043] After the composite particles are cooled, they are classified twice by the classifier. The first classification takes 2# as the target outlet. feed port. The particle size of the composite particle after twice classification is 13~22 μm, PSD is 0.9~1.1, and described PSD calculation method is (D 90 -D 10 ) / D 50 .

[0044] Finally, the composite particles classified twice were transferred into a carbonization furnace, and the temperature was rapidly raised to 350°C at a rate of 10°C / min under a ni...

Embodiment 2

[0046] Microcrystalline graphite waste with a degree of graphitization of 93.2% and coal tar pitch (particle size 3.9 μm) with a softening point of 280° C. were mixed with VC machinery at a ratio of 10:1.5.

[0047] The mixed material was transferred into a drum furnace, and compositely granulated at 600° C. in an argon atmosphere. The rotation speed of the material in the granulation equipment was 15 rpm, and the granulation time was 8 hours.

[0048] After the composite particles are cooled, they are classified twice by a classifier, and the process is similar to that of Example 1.

[0049] Finally, the composite particles classified twice were transferred into a carbonization furnace, and the temperature was rapidly raised to 500°C at a rate of 5°C / min under an argon atmosphere, kept for 4 hours, and then slowly raised to 1250°C at a rate of 3°C / min , after 1 hour of heat preservation, it was naturally cooled, and then the 2# sample was obtained by breaking up, demagnetizin...

Embodiment 3

[0051] Microcrystalline graphite waste with a degree of graphitization of 93.2% and biomass pitch (particle size 3.3 μm) with a softening point of 200°C were mixed with VC machinery at a ratio of 10:2.3.

[0052] The mixed material was transferred into a horizontal furnace, and compositely granulated at 500° C. in an argon atmosphere. The rotation speed of the material in the granulation equipment was 40 rpm, and the granulation time was 5 hours.

[0053] After the composite particles are cooled, they are classified twice by the classifier F1, and the process is similar to that of Example 1.

[0054] Finally, the composite particles classified twice were transferred into a carbonization furnace, and the temperature was rapidly raised to 450°C at a rate of 7°C / min under an argon atmosphere, kept for 7 hours, and then slowly raised to 1100°C at a rate of 2°C / min , After heat preservation for 1h, cool naturally, and then disperse, demagnetize, and sieve to obtain 3# samples.

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Abstract

The invention discloses a production method of a rapid-charge microcrystalline graphite negative electrode material. The production method of the rapid-charge microcrystalline graphite negative electrode material comprises the steps of firstly, mixing microcrystalline graphite waste and additives, transferring a mixture into granulation equipment, and conducting composite granulation under a condition of an inert atmosphere to obtain composite particles; and after the composite particles are cooled, conducting two-time grading through a grader, transferring composite particles subjected to two-time grading into a carbonization furnace for carbonization, and then conducting natural cooling, breaking up, magnetism removing and screening to obtain the rapid-charge microcrystalline graphite negative electrode material. By means of the production method of the rapid-charge microcrystalline graphite negative electrode material, the problems that in the prior art, the microcrystalline graphite waste has oversize specific surface areas and low tap density, so that a rapid-charge negative electrode material is hard to produce are solved.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a fast-charging microcrystalline graphite negative electrode material and a preparation method thereof. Background technique [0002] With the ever-accelerating pace of life and the explosive growth of information circulation, people are increasingly dependent on the daily tools around them, and at the same time put forward higher requirements for their performance. As the most important portable secondary power supply, lithium-ion has been widely used in various daily tools, such as mobile phones, I-Watch, notebook computers, electric vehicles, etc. However, the current lithium-ion batteries generally have the problem of slow charging speed, This greatly affects people's comfort when using corresponding everyday tools. Therefore, the development of fast-charging lithium-ion batteries has become the main direction at present. [00...

Claims

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Application Information

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IPC IPC(8): C01B32/205H01M4/587H01M10/0525
CPCC01B32/205H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 石磊邵浩明王志勇皮涛黄越华余梦泽
Owner HUNAN SHINZOOM TECH
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