Method for preparing high-rate artificial graphite anode material

An artificial graphite negative electrode, high-rate technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of easy aggregation of charged particles, poor slurry dispersion effect, poor processing performance, etc., to increase the spreadability. , The effect of reducing viscosity and improving processability

Active Publication Date: 2019-05-31
KEDA (ANHUI) NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
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  • 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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  • Method for preparing high-rate artificial graphite anode material
  • Method for preparing high-rate artificial graphite anode material

Examples

Experimental program
Comparison scheme
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 anode material, comprising the following steps: (1) preferential selection of pulverized and shaped tailings; (2) mixing; (3) static coating and granulation; (4) breaking and spheroidization; (5) secondary mixing; (6) high-temperature graphitization; and (7) mixing andsieving. The anode material prepared by the method has excellent high rate charge/discharge performance, and has good cycle performance and low-temperature temperature. The method also fully processesand recycles the by-products produced in the processing of coke raw materials/asphalt raw materials in a high value-added manner, has broad market prospects, reduces the disposal cost of solid waste,and brings practical 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 Applications(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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