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Preparation method of asphalt liquid phase coated modified artificial graphite lithium battery cathode material

A technology of artificial graphite and negative electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low initial efficiency and specific capacity of artificial graphite, rough surface of artificial graphite, large specific surface, etc., and is suitable for industrial scale production. , the effect of improving specific capacity and cycle stability, and high specific capacity

Active Publication Date: 2014-03-26
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the surface of artificial graphite is rough, porous, and the specific surface is large, and it is also sensitive to the solvent in the electrolyte, which makes the initial efficiency and specific capacity (≤350mAh / g) of artificial graphite lower.

Method used

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  • Preparation method of asphalt liquid phase coated modified artificial graphite lithium battery cathode material
  • Preparation method of asphalt liquid phase coated modified artificial graphite lithium battery cathode material
  • Preparation method of asphalt liquid phase coated modified artificial graphite lithium battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Preparation of lithium battery anode material of modified artificial graphite coated with asphalt liquid phase:

[0037] (1) Mechanically pulverize petroleum coke, then perform mechanical ball milling on the powder to obtain fine powder, and carry out fine powder classification;

[0038] (2) Mix the classified fine powder with an appropriate amount (5%) of asphalt powder, and then put the evenly mixed powder into a medium-temperature reactor for reaction (the temperature in the reactor is 500°C, and the stirring speed in the kettle is 40r / min, the reaction time is 8h), and finally discharged.

[0039] (3) Pass the discharged powder through the shaping and classifying machine for shaping and grading again;

[0040] (4) Carry out high-temperature graphitization treatment (2500°C for 36h) of the product obtained above, and then undergo classification treatment to obtain artificial graphite material A (D 50 =10um).

[0041] (5) Add A prepared in step 1 into ...

Embodiment 2

[0050] (1) Preparation of lithium battery anode material of modified artificial graphite coated with asphalt liquid phase:

[0051] (1) Mechanically pulverize petroleum coke, then perform mechanical ball milling on the powder to obtain fine powder, and carry out fine powder classification;

[0052] (2) Mix the classified fine powder with an appropriate amount (5%) of asphalt powder, and then put the evenly mixed powder into a medium-temperature reactor for reaction (the temperature in the reactor is 500°C, and the stirring speed in the kettle is 40r / min, the reaction time is 8h), and finally discharged.

[0053] (3) Pass the discharged powder through the shaping and classifying machine for shaping and grading again;

[0054] (4) Carry out high-temperature graphitization treatment (2500°C for 36h) of the product obtained above, and then undergo classification treatment to obtain artificial graphite material A (D 50 =10um).

[0055] (5) Add A prepared in step 1 into ...

Embodiment 3

[0063] (1) Preparation of lithium battery anode material of modified artificial graphite coated with asphalt liquid phase:

[0064] (1) Mechanically pulverize petroleum coke, then perform mechanical ball milling on the powder to obtain fine powder, and carry out fine powder classification;

[0065] (2) Mix the classified fine powder with an appropriate amount (5%) of asphalt powder, and then put the evenly mixed powder into a medium-temperature reactor for reaction (the temperature in the reactor is 500°C, and the stirring speed in the kettle is 40r / min, the reaction time is 8h), and finally discharged.

[0066] (3) Pass the discharged powder through the shaping and classifying machine for shaping and grading again;

[0067] (4) Carry out high-temperature graphitization treatment (2500°C for 36h) of the product obtained above, and then undergo classification treatment to obtain artificial graphite material A (D 50 =10um).

[0068] (5) Add A prepared in step 1 into ...

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Abstract

The invention provides a preparation method and an application of an asphalt liquid phase coated modified artificial graphite lithium battery cathode material. The method comprises the steps of mechanically grinding petroleum coke, mixing with an appropriate amount of (3-8%) asphalt powder after stage treatment, performing reaction for 6-10h in a moderate temperature reaction kettle at 500-650 DEG C, performing reshaping stage treatment again, performing reaction for 36-72h at 2400-3000 DEG C for high-temperature graphitization treatment, finally obtaining an unmodified artificial graphite material through stage treatment, then further dissolving the unmodified artificial graphite material and asphalt in a dispersing agent, stirring to obtain uniform mixing liquid, preparing the uniform mixing liquid into composite powder with a closed cycle spray dryer, heating for 1-5h at 700-1100 DEG C, and finally obtaining the asphalt liquid phase coated modified artificial graphite material. After the asphalt liquid phase coated modified artificial graphite prepared by the method is applied to a lithium battery, the artificial graphite shows excellent electrochemical properties such as high first charge-discharge efficiency, high specific capacity and good cycle performance.

Description

technical field [0001] The invention relates to the field of preparation of lithium battery electrode materials, in particular to the preparation of a lithium battery negative electrode material coated with asphalt liquid-phase modified artificial graphite. Background technique [0002] Compared with other secondary batteries, lithium batteries have the advantages of high working voltage, high energy density, stable discharge voltage, long cycle life, and environmental friendliness. They have been widely used in portable electronic products and power tools, and are expected to become the future hybrid One of the main energy supplies for power vehicles and pure power vehicles. Anode materials are one of the key factors to evaluate the overall performance of lithium batteries. At present, the anode materials for lithium batteries commercially used are mainly carbon materials, including easily graphitizable carbon, difficult graphitizable carbon and graphite. Graphite materia...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/587H01M4/1393
CPCY02E60/122H01M4/1393H01M4/587H01M4/62Y02E60/10
Inventor 晏荦候贤华
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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