Artificial graphite negative electrode material, preparation method, application and battery

An artificial graphite negative electrode and graphite crushing technology, which is applied to graphite, secondary batteries, battery electrodes, etc., can solve the problems of high cost of artificial graphite, ineffective use of by-products, waste, etc.

Pending Publication Date: 2021-04-27
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem solved by the present invention is to overcome the high cost of artificial graphite in the prior art, and the waste caus...

Method used

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  • Artificial graphite negative electrode material, preparation method, application and battery
  • Artificial graphite negative electrode material, preparation method, application and battery
  • Artificial graphite negative electrode material, preparation method, application and battery

Examples

Experimental program
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Effect test

Embodiment 1

[0056](1) Grinding electrode graphite pieces with a diameter of 20 mm through a mechanical pulverizer LHJ-150, the average particle size D50 after classification is 14.0 μm, and using an electromagnetic demagnetizer ZR0709 to remove the magnetic substances in the above-mentioned graphite pieces to obtain a precursor The magnetic substance content of A is 0.4ppm;

[0057] (2) Put the precursor A and the epoxy resin into the fusion machine ZSJ-600 according to the mass ratio of 100:9, and carry out the modification treatment. The speed of the fusion machine is 800HZ, and the temperature of the modification treatment is 20°C. The modification treatment time is 4 minutes, and the precursor B is obtained;

[0058] (3) Under a nitrogen atmosphere, place the precursor B in a carbonization furnace for carbonization, raise the temperature to 1200° C. and keep it at the same temperature for 5 hours to obtain an artificial graphite anode material.

[0059] The particle diameter D50 of t...

Embodiment 2

[0061] (1) with embodiment 1 step (1);

[0062] (2) Put the precursor A and the epoxy resin into the fusion machine ZSJ-600 according to the mass ratio of 100:12, and carry out the modification treatment. The speed of the fusion machine is 800HZ, and the temperature of the modification treatment is 20°C. The modification treatment time is 4 minutes, and the precursor B is obtained;

[0063] (3) With embodiment 1 step (3).

[0064] The particle diameter D50 of the artificial graphite negative electrode material that embodiment 2 obtains is 16.9 μ m, and tap density is 0.90 g / cm 3 , the specific surface area is 1.5m 2 / g, the magnetic substance content is 1.0ppm, the discharge capacity is 348.0mAh / g, the first efficiency is 92.3%, and the 1C / 1C 500 cycle capacity retention rate is 92.0%.

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Abstract

The invention discloses an artificial graphite negative electrode material, a preparation method, application and a battery. The preparation method of the artificial graphite negative electrode material comprises the following steps of (1) carrying out electric demagnetization on graphite fragments with the particle size D50 of 13.5-17.5 microns to obtain a precursor A; (2) the precursor A and a coating agent being modified to obtain a precursor B, and the curing temperature of the coating agent being 80-150 DEG C; and (3) carrying out heat treatment on the precursor B to obtain the artificial graphite negative electrode material. The preparation method of the artificial graphite negative electrode material is simple, short in process time consumption and easy for mass production, the raw materials are common industrial products, and the raw material graphite scraps are low in cost and stable in source; compared with the prior art, the artificial graphite negative electrode material prepared by using the crushed graphite can ensure relatively high tap density, initial efficiency, rate capability and cycle capacity retention ratio, and meets the use requirements of the artificial graphite negative electrode material.

Description

technical field [0001] The invention specifically relates to an artificial graphite negative electrode material, a preparation method, an application and a battery. Background technique [0002] In 1990, Sony Corporation commercialized lithium-ion battery negative electrode carbon materials for the first time. Because of its high energy density, long cycle, no memory effect and green environmental protection, it has been widely used in 3C electronic portable products, new energy vehicles and other social fields. widely used. Among them, the negative electrode material is the main component of lithium-ion batteries, and there are already systems such as natural graphite, artificial graphite, hard carbon, soft carbon, graphene and carbon nanotubes. Among them, artificial graphite is used as the negative electrode material, which has the advantages of good cycle performance and rate performance, and good selectivity to the electrolyte. With the development of technology, the ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525H01M4/133H01M4/1393C01B32/20C01B32/205
CPCH01M4/366H01M4/583H01M4/625H01M4/133H01M4/1393H01M10/0525C01B32/20C01B32/205Y02E60/10
Inventor 鄂卓胡钦山顾凯王旭峰王春国潘孟李虹
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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