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Preparation method of coal-based artificial graphite negative electrode material

An artificial graphite negative electrode, coal-based technology, applied in chemical instruments and methods, battery electrodes, inorganic chemistry, etc., can solve problems such as high cost of raw materials, and achieve the effects of high capacity, low cost, and high magnification

Pending Publication Date: 2021-10-26
孙仲振
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional artificial graphite is mainly obtained through high-temperature graphitization of needle coke, coke, pitch and other raw materials, and the cost of raw materials is relatively high; and when lithium-ion batteries are used in power tools, aerospace models, drones and other fields, they are required to have High rate performance, and the ability to charge and discharge with high current

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  • Preparation method of coal-based artificial graphite negative electrode material

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preparation example Construction

[0032] A preferred embodiment of the present invention provides a method for preparing a coal-based artificial graphite negative electrode material, comprising the following steps:

[0033] (1) Coking coal powder treatment: choose coking coal powder as the raw material and crush until the particle size is less than 30 μm; uniformly mix the crushed coking coal powder material and acid solution at a mass ratio of 1:5, stir or stand at room temperature, and then It is filtered and washed to remove the ash in the coal powder; it is classified according to different particle size ranges, and the coking coal powder with different particle sizes is graded according to the particle size ratio, and mixed evenly to obtain raw material A;

[0034] (2) Carbonization: At least one of needle-shaped petroleum coke, calcined coke or delayed coke is raw material B. After mixing A and B raw materials in a certain proportion, add petroleum asphalt micropowder C and mix. The obtained material is a...

Embodiment 1

[0054] (1) Coking coal powder treatment: choose 5000g coking coal powder as the raw material and crush until the particle size is less than 30 μm; after the raw coal-based coke powder is dried at 110°C for 24 hours, it is evenly mixed with the acid solution at a mass ratio of 1:5, and stirred at room temperature or Stand still, then filter and wash it to remove the ash in the coal powder; classify according to different particle size ranges, grade coking coal powder with different particle sizes according to the particle size ratio, and mix them evenly to obtain the average particle size D50 of 15um raw material A;

[0055] (2) Carbonization: take 1000g of needle-shaped petroleum coke raw material B, mix A and B raw materials according to the ratio of 2:1 to obtain 3000g of mixed material, add 150g of petroleum asphalt micropowder C and mix, and the obtained material is carbonized at 1000°C;

[0056] (3) Graphitization: Add 5% boron nitride to the carbonized material, and grap...

Embodiment 2

[0059] Example 2: (1) Coking coal powder treatment: choose 5000g coking coal powder as the raw material and crush it until the particle size is less than 30 μm; after drying the raw coal-based coke powder at 110°C for 24 hours, mix it with the acid solution at a mass ratio of 1:5, Stir or stand at room temperature, then filter and wash it to remove the ash in the coal powder; classify according to different particle size ranges, grade coking coal powder with different particle sizes according to the particle size ratio, and mix them evenly to obtain the average particle size D50 is 15um raw material A;

[0060] (2) Carbonization: Take 1000g of calcined coke raw material B, mix A and B raw materials according to the ratio of 2:1 to obtain 3000g of mixed material, add 150g of petroleum asphalt micropowder C and mix, and the obtained material is carbonized at 1000°C;

[0061] (3) Graphitization: Add 5% boron nitride to the carbonized material, and graphitize it for 10 hours at a ...

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Abstract

The invention discloses a preparation method of a coal-based artificial graphite negative electrode material, which comprises the following steps of drying coking coal powder, crushing, removing impurities, grading and grading to ensure that the particle size of the coking coal powder meets the production requirement, and grading to optimize the particle size distribution range to obtain a raw material A, taking at least one of needle-like petroleum coke, calcined coke or delayed coke as a raw material B, mixing the raw materials A and B according to a certain proportion, adding petroleum asphalt micro powder C for mixing, andcarbonizing the obtained material at 1200-1500 DEG C, adding boron or a boron compound into the carbonized material, graphitizing at 2800-3200 DEG C, crushing and shaping, adding a raw material D, and carrying out mechanical ball milling treatment. Cheap coking coal is used as a raw material, a mature technological process in the carbon industry is adopted, the artificial graphite negative electrode material with good battery processing performance is prepared, and meanwhile the method has the advantages of being low in cost, high in rate, high in capacity rate and long in service life.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing, and in particular relates to a preparation method of a coal-based artificial graphite negative electrode material. Background technique [0002] Lithium-ion batteries are widely used in various fields such as notebook computers, mobile phones, new energy vehicles, electric vehicles, charging power supplies, power tools, and digital communication equipment. Among lithium-ion battery anode materials, graphite-based carbon anode materials have a wide range of sources. It is cheap and has always been the main type of negative electrode materials, among which artificial graphite is one of the mainstream negative electrode materials. [0003] Lithium-ion batteries have good application prospects in large-scale renewable energy access, power grid peak-shaving and frequency modulation, household energy storage, communication stations, industrial energy conservation, green buildi...

Claims

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Application Information

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IPC IPC(8): C01B32/205H01M4/587H01M10/0525
CPCC01B32/205H01M4/587H01M10/0525Y02E60/10
Inventor 孙仲振
Owner 孙仲振
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