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Graphite negative material, preparation method thereof and cell

A graphite anode and raw material technology, applied in the direction of graphite, battery electrodes, chemical instruments and methods, etc., can solve the problems of high cost, limited development and application, etc., and achieve the effects of low cost, good charge-discharge cycle performance, and a wide range of sources.

Pending Publication Date: 2019-08-02
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, oil-based needle coke and coal-based needle coke have the advantages of high carbon content and easy graphitization, and are the main raw materials for high value-added carbon products. However, such materials are non-renewable materials and their cost is high, which limits their development application

Method used

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  • Graphite negative material, preparation method thereof and cell
  • Graphite negative material, preparation method thereof and cell
  • Graphite negative material, preparation method thereof and cell

Examples

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preparation example Construction

[0034] The preparation method of the graphite negative electrode material of one embodiment of the present invention, comprises the following steps:

[0035] S101: Mixing the cellulose raw material, catalyst and dispersant, ball milling and drying to obtain nanocrystalline spheroidized precursor particles.

[0036] Among them, the cellulose raw material can be the rhizome, core shell, etc. of plants rich in cellulose, which is not particularly limited here, and can be pulverized by a crushing device to obtain a cellulose raw material with a desired particle size. It can also directly adopt commercially available industrial cellulose raw materials.

[0037] In the present invention, the catalyst is a co-catalyst composed of a nickel-containing compound and an electron-deficient compound. Since nickel is a transition metal element, it has a strong hydrodehydrogenation effect, and the electron-deficient compound has the effect of stabilizing carbocations. Under the synergistic e...

Embodiment 1

[0054] Mix cellulose raw material, dispersion medium, dispersant (content 1%), defoamer (content 0.2-0.5%), co-catalyst nickel acetate / boron trioxide (content 0.5-2%) into the planetary ball mill, The planetary ball is ground for 5-10 hours to obtain a slurry (solid content: 40%), and the slurry is sprayed and granulated to obtain nanocrystalline spheroidized precursor particles with a particle size of 5-30 μm.

[0055] The spray-dried nanocrystalline spheroidized precursor particles were placed in a muffle furnace for heat treatment, and a stepwise heating program was adopted with an upper limit temperature of 1000°C for sintering for 96 hours.

[0056] After cooling, it was transferred to a medium frequency induction graphitization furnace, and nitrogen gas was introduced to carry out high-temperature graphitization. The graphitization temperature was 2000°C and the time was 24 hours. After graphitization, cool and demagnetize and pass through a 250-mesh sieve to prepare the...

Embodiment 2

[0060] Mix cellulose raw material, dispersion medium, dispersant (content 1%), defoamer (content 0.2-0.5%), co-catalyst nickel chloride / boron trioxide (content 0.5-2%) into the planetary ball mill , planetary ball milling for 5-10 hours to obtain slurry (solid content: 40%), and the slurry is sprayed and granulated to obtain nanocrystalline spheroidized precursor particles with a particle size of 5-30 μm.

[0061] The spray-dried nanocrystalline spheroidized precursor particles were placed in a muffle furnace for heat treatment, and a stepwise heating program was adopted with an upper limit temperature of 1000°C for sintering for 96 hours.

[0062] After cooling, it was transferred to a medium frequency induction graphitization furnace, and nitrogen gas was introduced to carry out high-temperature graphitization. The graphitization temperature was 2000°C and the time was 24 hours. After graphitization, cool and demagnetize and pass through a 250-mesh sieve to prepare the graph...

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Abstract

The invention relates to a graphite negative material, a preparation method thereof and a cell. The preparation method of the graphite negative material comprises the following steps that a celluloseraw material, a catalyst and a dispersant are mixed, ball-milled and dried to obtain nanocrystal spheroidized precursor particles; and the nanocrystal spheroidized precursor particles are burned and then graphitized to prepare the graphite negative material. The catalyst is composed by a combination of a nickel compound and an electron deficiency compound. The graphite negative material has high electrochemical performance, and can reduce the production cost substantially.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a graphite negative electrode material, a preparation method thereof, and a battery. Background technique [0002] As a key core component of electric vehicles, power battery technology development has always been the focus of enterprises and other scientific research institutions. Benefiting from the impact of state subsidies, China's power battery industry is transitioning from an introduction period to a period of rapid growth. At the same time, with the increasingly stringent policy control, especially with the advent of the subsidy-free era, some power battery companies that cannot meet market requirements will be eliminated. Under the pressure of rising raw materials such as metal cobalt, falling sales prices, and intensified competition in the industry, the profit margins of power battery companies have dropped sharply, and even suffered losses. "Cost reduction" has bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62C01B32/20C01B32/205
CPCH01M4/583H01M4/625C01B32/20C01B32/205Y02E60/10
Inventor 周奇周晓航易四勇娄忠良
Owner SOUNDON NEW ENERGY TECH CO LTD
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