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Preparation method for reducing graphitization cost of graphite negative electrode material

A graphite negative electrode and graphitization technology, which is applied in chemical instruments and methods, negative electrodes, inorganic chemistry, etc., can solve the problems of increasing the cost of graphitization of negative electrode materials, reducing the charging amount of graphitization furnace, and low bulk density. Reduce preparation cost, improve production environment and reduce dust

Pending Publication Date: 2020-06-30
GUANGDONG DONGDAO NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the bulk density of the micropowder in the crucible is low, which will reduce the charging amount of the graphitization furnace, thereby increasing the graphitization cost of the negative electrode material

Method used

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  • Preparation method for reducing graphitization cost of graphite negative electrode material

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[0027] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0028] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0030] (1) Add 1g of polyvinyl alcohol into 100g of water, stir at 100r / min for 60min, then raise the temperature to 95°C, and continue stirring for 60min to prepare the adhesive;

[0031] (2) adding 10 g of the above binder to 100 g of needle coke calcined coke powder with a particle size of 3-60 μm and kneading to obtain a kneading material;

[0032] (3) Compressing the kneaded material of step (2) to obtain a molded product;

[0033] (4) Dry the molded product of step (3) at 120° C. to obtain product 1.

Embodiment 2

[0035] (1) Add 0.5g of polyacrylamide into 100g of water, stir at 120r / min for 40min, then raise the temperature to 90°C, and continue stirring for 100min to prepare the adhesive;

[0036] (2) adding 100 g of petroleum coke calcined coke micropowder with a particle size of 3-60 μm to 6 g of the above binder and kneading to obtain a kneading material;

[0037] (3) extruding the kneaded material of step (2) to obtain a molded product;

[0038] (4) Dry the molded product of step (3) at 150° C. to obtain product 2.

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Abstract

The invention provides a preparation method for reducing graphitization cost of a graphite negative electrode material. The method comprises the following steps: (1) mixing a high polymer material with water, and heating to prepare an adhesive; (2) mixing a raw material micro powder for preparing the graphite negative electrode material with the adhesive in the step (1), and kneading to obtain a mixed material; (3) pressing the mixed material obtained in the step (2) to obtain a pressed product; (4) drying the pressed product obtained in the step (3); and (5) carrying out high-temperature graphitization treatment on the dried material in the step (4). According to the method, the high polymer material which contains no benzene ring and can be dissolved in water is used as an adhesive, andthe micro powder is pressed into a block, so that the density is greatly improved, the charging amount of a crucible is increased by 50-80%, and the graphitization cost is greatly reduced. In addition, dust in the operation environment can be obviously reduced through profiling, and the production environment is improved.

Description

technical field [0001] The invention relates to the technical field of carbon negative electrode materials for lithium ion batteries, in particular to a preparation method for reducing the graphitization cost of graphite negative electrode materials. Background technique [0002] Lithium-ion batteries have become a new generation of secondary batteries since the 1990s after nickel-metal hydride batteries because of their advantages such as high operating voltage, high energy density, long cycle life, small self-discharge, and no memory effect. In the development process of lithium-ion battery technology, the quality of batteries has been continuously improved, and the production cost has been continuously reduced. Anode materials have played a large role in the contribution to the technological progress of lithium-ion batteries. At present, the anode materials of commercialized lithium-ion batteries are still dominated by graphite materials. The raw materials for artificial...

Claims

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Application Information

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IPC IPC(8): C01B32/205H01M4/587H01M10/0525
CPCC01B32/205H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 吴其修
Owner GUANGDONG DONGDAO NEW ENERGY