A kind of preparation method of high-rate artificial graphite negative electrode material

An artificial graphite negative electrode and high-magnification technology, which is applied in battery electrodes, structural parts, secondary battery repair/maintenance, etc., can solve the problems of easy aggregation of charged particles, poor dispersion effect of slurry, and large specific surface area, etc., to achieve cycle Excellent performance, increased spreadability, and the effect of expanding the contact area

Active Publication Date: 2021-11-05
KEDA (ANHUI) NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the mixing process, ultrafine particles are charged with static electricity due to friction, thermoelectric effects, etc., and the charged particles are prone to agglomeration, and because of the large specific surface area and high oil absorption value, it is not easy to mix.
The patent CN108807996A in the modification process uses coke with an average particle size D50 of 3 to 10 μm as raw material to be graphitized to form a graphite precursor with a small particle size, and then uses pitch as a modifier, after mixed carbonization and sintering, etc. A layer of amorphous carbon is coated on the surface of graphite micropowder to obtain a single graphite particle with a layer of amorphous carbon structure on the surface. The rate performance is good, but the processing performance is poor in the homogenization stage, and the slurry dispersion effect is prone to be poor. , difficulty in sieving, etc.

Method used

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  • A kind of preparation method of high-rate artificial graphite negative electrode material
  • A kind of preparation method of high-rate artificial graphite negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1. Strictly classify and optimize petroleum coke and asphalt tailings after crushing. The particle size D50 of petroleum coke is 2-4 μm, and the particle size D50 of asphalt is 1-3 μm;

[0030] 2. The mass ratio of petroleum coke tailings, pitch tailings, and carbon black filler is 100:0.1:0.2, the mass ratio of pitch to petroleum tar is 1:2, and the mass ratio of pitch to oleic acid is 100:0.1; mix at room temperature, and then Homogenous mixing in fusion equipment with mechanical shear;

[0031] 3. Mold the mixture under the unit pressure of 120Mpa, and conduct carbonization heat treatment at 1300°C for 15 hours under the protection of inert gas;

[0032] 4. The material after carbonization coating and granulation is crushed and spheroidized, and the particle size D50 is 8-12 μm;

[0033] 5. Mix the "tailing" produced in the spheroidization process into the spheroidized material, fill the gaps between the particles, add phenolic resin, and then mix evenly in the fusi...

Embodiment 2

[0037] 1. Strict classification and optimization of pitch coke and tailings after asphalt crushing, the particle size D50 of pitch coke is 2-4 μm, and the particle size D50 of pitch is 1-3 μm;

[0038] 2. The mass ratio of pitch coke tailings, pitch tailings, and carbon black filler is 100:0.15:0.2, the mass ratio of pitch to petroleum tar is 1:2, and the mass ratio of pitch to oleic acid is 100:0.1; mix at room temperature, and then Homogenous mixing in fusion equipment with mechanical shear;

[0039] 3. Mold the mixture under the unit pressure of 120Mpa, and conduct carbonization heat treatment at 1300°C for 15 hours under the protection of inert gas;

[0040] 4. The material after carbonization coating and granulation is crushed and spheroidized, and the particle size D50 is 10-14 μm;

[0041] 5. Mix the "tailing" produced in the spheroidization process into the spheroidized material, fill the gaps between the particles, add phenolic resin, and then mix evenly in the fusio...

Embodiment 3

[0045] 1. Strictly classify and optimize needle coke and asphalt tailings after crushing. The particle size D50 of needle coke is 2-4 μm, and the particle size D50 of asphalt is 1-3 μm;

[0046] 2. The mass ratio of pitch coke tailings, pitch tailings, and carbon black filler is 100:0.5:0.4, the mass ratio of pitch to petroleum tar is 1:3, and the mass ratio of pitch to oleic acid is 100:0.15; mix at room temperature, and then Homogenous mixing in fusion equipment with mechanical shear;

[0047]3. Mold the mixture under the unit pressure of 120Mpa, and conduct carbonization heat treatment at 1000°C for 20 hours under the protection of inert gas;

[0048] 4. The material after carbonization coating and granulation is crushed and spheroidized, and the particle size D50 is 12-14 μm;

[0049] 5. Mix the "tailing" produced in the spheroidization process into the spheroidized material, fill the gaps between the particles, add phenolic resin, and then mix evenly in the fusion equipm...

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Abstract

The invention belongs to the field of lithium-ion batteries, and relates to a method for preparing a high-rate artificial graphite negative electrode material, comprising the following steps: (1) crushing and shaping the tail material; (2) mixing; (3) static coating and granulation; (4) (5) secondary mixing; (6) high temperature graphitization; (7) mixing and screening, the negative electrode material prepared by the inventive method has excellent high-rate charge-discharge performance, and its circulation, low temperature The performance is good, and the method can also fully process and recycle the by-products produced in the production and processing of coke raw materials / asphalt raw materials with high added value, which has broad market prospects, reduces the cost of solid waste treatment, and brings actual economic benefits.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a high-rate artificial graphite negative electrode material. Background technique [0002] With the increasing demand for power EV batteries in the domestic and foreign markets, the requirements for battery power density have once again increased, and it has become an urgent need to further increase the charge and discharge rate of batteries, especially the anode materials that can be used in high charge and discharge rate scenarios. [0003] In the production process of artificial graphite anode materials, coke raw materials (including petroleum coke, needle coke, etc.) / pitch raw materials need to be pulverized to the required particle size range by a pulverizer, and then spheroidized by a shaping machine. This crushing (reshaping) process needs to be graded to obtain intermediate semi-finished products. Generally, the yield of coke raw ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525H01M10/42
CPCY02E60/10
Inventor 何英锡梅海龙陈伟龙伟冷九够付健戴涛
Owner KEDA (ANHUI) NEW MATERIAL CO LTD
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