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Method for preparing artificial graphite negative electrode material from resistance material

A technology of artificial graphite negative electrode and resistance material, which is applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of producing artificial graphite negative electrode material, backward treatment method of resistance material, high cost of artificial graphite, etc., and achieve improved kinetic performance , low cost, easy to process

Pending Publication Date: 2021-04-13
SHANGHAI SHANSHAN TECH CO LTD
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  • Application Information

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Problems solved by technology

[0004] In order to solve the defects in the prior art that the cost of artificial graphite is too high, and the treatment method of resistance material is backward, it cannot be used for industrial production of artificial graphite negative electrode material, the invention provides a method for preparing artificial graphite negative electrode material with resistance material and its The prepared artificial graphite negative electrode material

Method used

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  • Method for preparing artificial graphite negative electrode material from resistance material
  • Method for preparing artificial graphite negative electrode material from resistance material
  • Method for preparing artificial graphite negative electrode material from resistance material

Examples

Experimental program
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Embodiment 1

[0035] This embodiment is a method for preparing a low-cost lithium-ion battery negative electrode material. Specific steps are as follows:

[0036] (1) The resistance material (2-10 cm in diameter) produced by the graphitization crucible furnace is coarsely crushed by a coarse crusher (roller-jaw-crusher integrated machine), and the average particle size D50 is 100.0-200.0 μm.

[0037] (2) The coarsely crushed graphitized resistor material obtained in step (1) is crushed through a pulverizer (mechanical mill 500), and the average particle diameter D50 is 14.0-19.0 μm.

[0038] (3) Pass the pulverized resistance material obtained in step (2) through a shaping machine (intermittent shaping machine 800) to remove fine powder, improve the degree of sphericity to improve vibration, Dmin≥2.0μm, and the average particle size D50 is 16.0~ 19.0μm, the vibration is 0.85~1.0g / cm 3 .

[0039] (4) The reshaped resistance material obtained in step (3) is passed through an electromagneti...

Embodiment 2

[0045] The difference between this embodiment and Example 1 is that the crushing equipment used in step (2): mechanical mill 500 and the 800 shaping machine used in step (3) are generally replaced with 60 spherical shaping equipment, and the resistance material Dmin ≥2.0μm, the ratio of resistance material to asphalt is 100:3, other things remain unchanged. The average particle size D50 of graphite coated with resistance material is 16.0-19.0 μm, and the tap density is 0.87 g / cm 3 , the specific surface area is 4.0m 2 / g, magnetic substance content ~ 1.5ppm, discharge capacity 353.1mAh / g, initial efficiency 90.5%, 1C / 1C 500 cycle capacity retention rate 92.1%.

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Abstract

The invention discloses a method for preparing an artificial graphite negative electrode material from a resistance material, the artificial graphite negative electrode material which is obtained by the method and is not graphitized, and a lithium battery prepared from the artificial graphite negative electrode material. According to the method disclosed by the invention, the resistance material in the preparation process of the artificial graphite is crushed and shaped to improve the tap density, and the electromagnetism is removed to meet the use requirements of the artificial graphite, and the method does not need high-cost and time-consuming graphitization. Therefore, the performance is close to that of artificial graphite, and the performance of a battery manufactured by the artificial graphite is close to that of a battery manufactured by common artificial graphite.

Description

technical field [0001] The invention belongs to the field of preparation of negative electrode materials of lithium ion batteries, and in particular relates to a method for preparing artificial graphite negative electrode materials by using resistance materials. Background technique [0002] In today's society, with the development of industry and the massive burning of fossil fuels, the energy crisis and the aggravation of environmental pollution follow. Therefore, all developed countries in the world have released a timetable for banning the sale of fuel vehicles, and my country will also completely ban the sale of fuel vehicles in 2040. All countries are vigorously developing new energy vehicles. At the same time, due to the popularity of various portable electronic devices and electric tools, the development of lithium-ion secondary batteries has become particularly important. Among them, the negative electrode material is an important part of the lithium-ion secondary ...

Claims

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Application Information

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IPC IPC(8): C01B32/205H01M4/587H01M10/052H01M10/0525
CPCC01B32/205H01M4/587H01M10/052H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 蒋守鑫吴志红丁晓阳苗荣荣李富营刘梦阳鄂卓
Owner SHANGHAI SHANSHAN TECH CO LTD
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