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Modified natural graphite negative electrode material for power battery and preparation method of modified natural graphite negative electrode material

A natural graphite and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of small layer spacing, poor rate performance, battery cycle failure, etc., to reduce the possibility of direct contact and suppress co-embedding , The effect of improving cycle performance

Active Publication Date: 2021-09-21
LUOYANG YUEXING NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its high degree of graphitization and small interlayer spacing, during the charging and discharging process of lithium-ion batteries, the electrolyte solvent and the solvent are co-embedded in the graphite sheets, which may easily cause the graphite sheets to peel off and cause battery cycle failure.
At present, binder coating is generally used to stabilize the structure by introducing amorphous carbon, thereby improving cycle performance; in addition, because natural graphite has a regular parallel lamellar structure and poor isotropy, compared with other synthetic graphite anode materials, Poor magnification performance

Method used

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Examples

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Effect test

preparation example Construction

[0024] A method for preparing a modified natural graphite negative electrode material for a power battery, comprising the following preparation steps:

[0025] Step 1. Perform graphitization treatment on the micropowder tailings produced in isotropic coke crushing at a temperature of 2600-3200°C, demagnetize and sieve to obtain material 1;

[0026] Step 2. Mix natural graphite with material 1 and binder at a mass ratio of 100:(2~30):(3~20) in a mixer for 0.5~2h to obtain material 2;

[0027] Step 3: Process material 2 in a mechanical fusion machine at a linear speed of 10-30m / s for 1-30min to obtain material 3;

[0028] Step 4. Stir the nitrogen source melamine and carbon source organic acid in the solvent evenly. The mass ratio of nitrogen source, carbon source and solvent is 1:0.8~2:6~10 to prepare a slurry, and add material 3 to the slurry Mix uniformly to obtain material 4;

[0029] Step 5, filter material 4 at 20-35°C and dry at 50-120°C for 12-24 hours, and set aside; ...

Embodiment 1

[0041] A method for preparing a modified natural graphite negative electrode material for a power battery, comprising the following preparation steps:

[0042] Step 1. Graphitize the micropowder tailings produced in the pulverization of pitch coke at a temperature of 3000°C, the degree of graphitization is 85%, demagnetize and sieve to obtain graphitized micropowder tailings with a particle size of 2-5 μm , record material 1;

[0043] Step 2. Mix spherical natural graphite with a D50 of 5-12 μm and material 1. The binder is mixed in a mixer for 1 hour at a mass ratio of 100:15:12. The binder is asphalt, and the average particle size of the binder is D50. 5 μm, obtained material 2;

[0044] Step 3: Process material 2 in a mechanical fusion machine at a linear speed of 20m / s for 20 minutes to obtain material 3;

[0045] Step 4. Stir the nitrogen source melamine and carbon source organic acid in the solvent evenly. The mass ratio of nitrogen source, carbon source and solvent is...

Embodiment 2

[0049] A method for preparing a modified natural graphite negative electrode material for a power battery, comprising the following preparation steps:

[0050] Step 1. Graphitize the micropowder tailings produced in the pulverization of petroleum coke at a temperature of 2800°C, the degree of graphitization is 85%, demagnetize and sieve to obtain graphitized micropowder tailings with a particle size of 2 to 5 μm , record material 1;

[0051] Step 2. Mix spherical natural graphite with a D50 of 5-12 μm and material 1. The binder is mixed in a mixer for 1 hour at a mass ratio of 100:20:8. The binder is pitch, and the average particle size of the binder is D50. 5 μm, obtained material 2;

[0052] Step 3: Process material 2 in a mechanical fusion machine at a linear speed of 20m / s for 20 minutes to obtain material 3;

[0053]Step 4. Stir nitrogen source melamine and carbon source organic acid in a solvent evenly. The mass ratio of nitrogen source, carbon source and solvent is 1:...

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Abstract

The invention provides a modified natural graphite negative electrode material for a power battery and a preparation method of the modified natural graphite negative electrode material. The preparation method comprises the following preparation steps of carrying out graphitization treatment on micro-powder tailings generated in isotropic coke crushing, and carrying out demagnetizing screening to obtain a material I, mixing natural graphite with the material I and a binder in a mixer to obtain a material II, treating the material II in a mechanical fusion machine to obtain a material III, uniformly stirring a nitrogen source melamine and a carbon source organic acid in a solvent to prepare slurry, adding the material III into the slurry, and uniformly mixing to obtain a material IV, filtering and drying the material IV, and carbonizing, grinding, scattering and screening the material obtained in the fifth step to obtain a finished product. Compared with natural graphite, the isotropic coke powder coated modifier has the lower graphitization degree and the larger interlayer spacing, the fast charging performance of the material can be effectively improved, the surface of the modified graphite is further coated with a nitrogen-doped amorphous carbon layer, on one hand, additional processing sites can be introduced, and the capacity is improved to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a modified natural graphite negative electrode material for power batteries and a preparation method thereof. Background technique [0002] Natural graphite has the characteristics of low cost and high energy density, and is widely used as anode material for lithium-ion batteries. However, due to its high degree of graphitization and small interlayer spacing, during the charging and discharging process of lithium-ion batteries, the electrolyte solvent and solvent are co-embedded in graphite sheets, which may easily cause graphite sheets to peel off and cause battery cycle failure. At present, binder coating is generally used to stabilize the structure by introducing amorphous carbon, thereby improving cycle performance; in addition, because natural graphite has a regular parallel lamellar structure and poor isotropy, comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/583H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 徐军红陈和平陈玉
Owner LUOYANG YUEXING NEW ENERGY TECH
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