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A kind of production method of modified artificial graphite negative electrode material

A technology of artificial graphite negative electrode and production method, which is applied to battery electrodes, electrochemical generators, electrical components, etc., can solve the problems affecting battery cycle performance, graphite layer peeling, pulverization, etc., so as to improve the peeling phenomenon and reduce active points. , the effect of strengthening the stability

Active Publication Date: 2017-08-08
大连宏光锂业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the interlayer spacing of graphite is smaller than the interlayer spacing of graphite lithium intercalation compounds, the interlayer spacing of graphite changes during charging and discharging, which may easily cause the graphite layer to peel off and pulverize, and lithium ions and organic solvent molecules will also intercalate into the graphite layer and Organic solvents decompose, thereby affecting battery cycle performance

Method used

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  • A kind of production method of modified artificial graphite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 50kg of petroleum asphalt raw material B, and perform jet milling, with a crushing particle size of ≤2µm; weigh 50kg of coal tar pitch raw material C, and perform jet crushing, with a crushing particle size of ≤2µm.

[0032] Weigh 100 kg of petroleum coke powder raw material A, and carry out shaping treatment for 30 minutes.

[0033] Weigh 80kg of petroleum coke raw material A after reshaping, add 3.2kg of petroleum pitch micropowder B, carry out airflow mixing, and after mixing evenly, carry out secondary granulation by extrusion fusion, with a median particle size of 18µm.

[0034] Weigh 50kg of the granulated material, add 0.5kg of coal tar pitch raw material C, add 0.5kg of coal tar raw material D, and carry out modification treatment at a temperature of 300~600°C. Then put it into a graphitization furnace and carry out graphitization treatment at 2600°C.

[0035] After the material was cooled to room temperature, it was taken out to be dispersed and classifi...

Embodiment 2

[0038] Weigh 50kg of petroleum asphalt B and carry out jet milling, and the crushing particle size is ≤2µm; weigh 50kg of coal tar pitch C, and carry out jet milling, and the crushing particle size is ≤2µm.

[0039] Weigh 100 kg of petroleum coke powder raw material A, and carry out shaping treatment for 30 minutes.

[0040] Weigh 80kg of petroleum coke raw material A after reshaping, add 4.0kg of petroleum pitch micropowder B, carry out airflow mixing, and after mixing evenly, carry out secondary granulation by extrusion fusion, with a median particle size of 15µm.

[0041] Weigh 50kg of the granulated material, add 1.0kg of coal tar pitch raw material C, add 0.5kg of coal tar raw material D, and carry out modification treatment at a temperature of 300-600°C. Then put it into a resistance graphitization furnace, and carry out low-temperature graphitization treatment at 3000°C.

[0042] After the material was cooled to room temperature, it was taken out to be dispersed and cl...

Embodiment 3

[0045] Weigh 50kg of petroleum asphalt raw material B, and perform jet milling, with a crushing particle size of ≤2µm; weigh 50kg of coal tar pitch raw material C, and perform jet crushing, with a crushing particle size of ≤2µm.

[0046] Weigh 100 kg of petroleum coke powder raw material A, and carry out shaping treatment for 30 minutes.

[0047] Weigh 80kg of petroleum coke raw material A after reshaping, add 2.4kg of petroleum pitch micropowder B, carry out airflow mixing, and after mixing evenly, carry out secondary granulation by extrusion fusion, with a median particle size of 16µm.

[0048] Weigh 50kg of the granulated material, add 1.5kg of coal tar pitch raw material C, add 0.5kg of coal tar raw material D, and carry out modification treatment at a temperature of 300~600°C. Then put it into a graphitization furnace, carry out carbonization treatment at 1400°C, and carry out graphitization treatment at 3000°C.

[0049] After the material was cooled to room temperature,...

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Abstract

The invention provides a production method for a modified artificial graphite negative electrode material. The method comprises: taking powder obtained by grinding petroleum coke as a main raw material and performing shaping treatment; adding a certain proportion of petroleum asphalt into the shaped petroleum coke material, and performing secondary granulation treatment in an extrusion fusion way; adding the granulated material into a mixture of petroleum asphalt and coal asphalt or coal tar, and performing coating modification treatment; putting the material into a graphitization furnace in bulk to perform high-temperature graphitization treatment, or performing carbonization and graphitization treatment in sequence; performing dispersion and grading treatment after the material is cooled to the room temperature; and finally adding few carbon nanotubes to perform mixing and screening. The method has the advantages that the main raw material is ground petroleum coke powder, and the powder is recycled, so that the cost can be reduced; secondary granulation of small granules can increase the capacity of the material and improve the cycle performance of the material; and due to the adoption of a graphite plate loading mode, the graphitization degree of the material can be increased, namely, the capacity can be increased, and the energy consumption cost can be reduced.

Description

technical field [0001] The invention relates to a production method of a modified artificial graphite negative electrode material, which belongs to the technical field of lithium ion battery negative electrode materials. Background technique [0002] The development of lithium-ion batteries originated in the 1990s, and it has been about 20 years. In the past 20 years, the lithium battery industry has made a leap. With the emphasis on the environment and new energy in various countries, lithium-ion batteries will develop by leaps and bounds. . Lithium-ion battery refers to a secondary battery system that uses two different lithium intercalation compounds that can reversibly intercalate and deintercalate lithium ions as the positive and negative electrodes of the battery, respectively. Graphite has become the current mainstream commercial lithium-ion battery anode material due to its advantages such as high electronic conductivity, large lithium ion diffusion coefficient, sma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/587H01M10/0525
CPCH01M4/366H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 王丽琼叶涛韩团辉单秉福
Owner 大连宏光锂业有限责任公司
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