Method for preparing high-rate lithium battery negative electrode material from natural graphite spherical tailings

A natural graphite, spherical technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of poor rate performance of natural graphite spherical tailings, and achieve the effect of improving rate performance, alleviating anisotropy, and simple operation

Pending Publication Date: 2022-08-05
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of poor magnification performance of natural graphite spherical tailings, the present invention provides a method for modifying natural graphite spherical tailings, using graphite surface functional groups to graft high-molecular polymers to prepare high-performance lithium battery negative electrode materials, which are graphite solid waste Processing provides a new path, the specific steps are as follows:

Method used

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  • Method for preparing high-rate lithium battery negative electrode material from natural graphite spherical tailings
  • Method for preparing high-rate lithium battery negative electrode material from natural graphite spherical tailings
  • Method for preparing high-rate lithium battery negative electrode material from natural graphite spherical tailings

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Experimental program
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Effect test

Embodiment 1

[0020] The purified natural graphite spherical tailings were placed in a beaker, a certain amount of 30% H2O2 solution was added, and the solid-liquid ratio of graphite to H2O2 solution was 1:50 to form a suspension, which was stirred at room temperature for 4 hours, and the reacted suspension was The turbid liquid was washed with a large amount of deionized water, filtered with suction and dried to obtain product 1. A certain amount of product 1 was mixed with organic solvent DMF, the solid-liquid ratio of graphite and DMF was 1:00, the catalyst NHS and EDC were added after ultrasonic dispersion for 30 minutes, the mass ratio of graphite and catalyst was 1:3, stirred at room temperature for 30 minutes, and then added The PEA solution with a molecular weight of 2000, the solid-liquid ratio of graphite to PEA is 1:6, and stirred at room temperature for 6 hours. The reacted product was washed with a large amount of DMF, centrifuged, filtered with suction and dried to obtain the ...

Embodiment 2

[0023] Put a certain mass of natural graphite spherical tailings after purification, sulfuric acid (concentration of 98.8wt.%) with a mass fraction of 5% of the graphite tailings and 30% H2O2 in a beaker to form a mixture, and use deionized water according to the solid-liquid ratio of 1. : 150 to a constant volume, after forming a suspension, stir at room temperature for 4 hours, rinse the reacted suspension with a large amount of deionized water, suction filtration and dry to obtain product 1. A certain amount of product 1 is mixed with organic solvent ethanol, the solid-liquid ratio of graphite and ethanol is 1:100, the catalyst HOBt is added after ultrasonic dispersion for 30min, the mass ratio of graphite and catalyst is 1:3, stirred at room temperature for 30min, and then added with a molecular weight of 2000 mPEG-NH2 solution, the solid-liquid ratio of graphite and mPEG-NH2 is 1:6, and stirred at room temperature for 6h. The reacted product was washed with a large amount...

Embodiment 3

[0026]Put a certain mass of natural graphite spherical tailings after purification and potassium permanganate solid powder with a mass fraction of 20% of the graphite tailings in a beaker to form a mixture, and use deionized water to make a solid-liquid ratio of 1:50 to form a suspension. The solution was stirred at room temperature for 8 h, the reacted suspension was washed with a large amount of deionized water, filtered and dried to obtain product 1. A certain amount of product 1 was mixed with organic solvent acetonitrile, the solid-liquid ratio of graphite and acetonitrile was 1:150, the catalyst DCC was added after ultrasonic dispersion for 30min, the mass ratio of graphite and catalyst was 1:2, stirred at room temperature for 30min, and then polyethylene was added. The solid-liquid ratio of imine, graphite and polyethyleneimine was 1:4, and the mixture was stirred at room temperature for 12 h. The reacted product was washed with a large amount of acetonitrile, centrifug...

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Abstract

The invention discloses a preparation method of a high-performance natural spherical graphite tailing-based lithium battery negative electrode material, and belongs to the field of secondary resource utilization. According to the method, small-size flaky spherical tailings are used as raw materials, graphite surface functional groups and high-molecular polymers are grafted to prepare the high-performance lithium battery negative electrode material, and the method comprises the following steps: firstly, carrying out oxidation treatment on natural spherical graphite tailings, washing, drying, and carrying out ultrasonic treatment on the natural spherical graphite tailings in an organic solution; and adding a catalyst to activate functional groups, adding a high-molecular polymer, reacting for a period of time, centrifuging, washing, carrying out suction filtration, and drying to obtain the high-performance lithium ion battery negative electrode material. The high-performance lithium battery negative electrode material is obtained by taking the natural graphite ball tailings as the raw material and grafting the polymer, high-valued utilization of the spherical tailings is realized, and the research process is green and environment-friendly, free of a high-temperature link and low in cost.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and discloses a method for preparing a high-performance lithium ion battery negative electrode material from natural graphite spherical tails. Background technique [0002] With the continuous deepening of the application of lithium-ion batteries in portable devices, electric vehicles and rail transit, the market demand for new lithium-ion batteries with high energy density, high power density, high safety and long life is more urgent. Graphite-based anode materials have long been dominant in anode materials due to their low and stable charge-discharge platform, relatively high theoretical specific capacity, and good structural stability. Graphite anode materials include artificial graphite and natural graphite. Compared with artificial graphite, natural graphite has relatively high crystallinity and is rich in resources. At the same time, there is no high-energy consumption process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/62H01M10/0525
CPCH01M4/587H01M4/622H01M10/0525H01M2004/027Y02E60/10
Inventor 公旭中孟悦付雨龙刘俊昊王志汪玉华
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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