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Method for preparing high-capacity graphite cathode material of lithium ion battery

A lithium-ion battery, graphite anode technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of low discharge capacity of artificial graphite, unable to meet the needs of use, low capacity, etc., to meet the needs of use, Alleviate the effect of low capacity and simple process conditions

Pending Publication Date: 2020-01-17
内蒙古瀚璞科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, graphite has the problem of low capacity as the negative electrode. After graphitization, the discharge capacity of artificial graphite is lower than 360mAh / g, which cannot meet the needs of use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] A preparation method of high-capacity lithium ion battery graphite negative electrode material, is characterized in that, comprises the following steps:

[0017] (1) Combine the coke powder in the plastic machine and pulverizer in the normal graphite production with the pulverized graphite expansion powder, mesocarbon microspheres, and binder at a ratio of 1:0.01-0.2:0.7-1.1: The mass ratio of 0.1-0.2 is put into the mixing batch machine and mixed for 1-3 hours to form a solid-phase coating mixture. The frequency of the mixing batch machine is 30-50Hz to obtain graphite powder;

[0018] (2) After mixing the obtained graphite powder with the catalyst, vacuumize and heat and stir at 150-250°C for 0.5-1h, the vacuum degree is 500-2000Pa, and the stirring speed is 2000-3500rpm;

[0019] (3) The catalyst-added powder is subjected to graphitization treatment for 10-48 hours at a carbonization temperature of 2000-2500° C. to obtain a graphitized powder, namely a graphite negat...

Embodiment 1

[0025] A preparation method of high-capacity lithium-ion battery graphite negative electrode material, comprising the following steps:

[0026] (1) The coke powder in the shaping machine and pulverizer in the normal graphite production, the coke powder is petroleum coke powder or needle-shaped coke powder, which is mechanically or air-pulverized powder, and the particle size of the coke powder is D 50 =10um, the ash content is less than 0.5%, pH=7, the volatile content of mesophase carbon microspheres is 10%, the ash content is less than 0.5%, and the particle size is D 50 =10um, mixed with pulverized expanded graphite powder, mesophase carbon microspheres, and binder in a batch mixer at a mass ratio of 1:0.01:0.7:0.1 for 1 hour to form a solid-phase coating mixture , the frequency of the mixed batch machine is 30Hz to obtain graphite powder;

[0027] (2) After mixing the obtained graphite powder with the catalyst, vacuumize and heat and stir at 200°C for 1h, the vacuum degre...

Embodiment 2

[0032] A preparation method of high-capacity lithium-ion battery graphite negative electrode material, comprising the following steps:

[0033] (1) The coke powder in the shaping machine and pulverizer in the normal graphite production, the coke powder is petroleum coke powder or needle-shaped coke powder, which is mechanically or air-pulverized powder, and the particle size of the coke powder is D 50 =2um, the ash content is less than 0.5%, pH=8, the volatile content of mesophase carbon microspheres is 10%, the ash content is less than 0.5%, and the particle size is D 50 =15um, mixed with pulverized expanded graphite powder, mesophase carbon microspheres, and binder in a batch mixer at a mass ratio of 1:0.01:0.7:0.1 for 2 hours to form a solid-phase coating mixture , the frequency of the mixed batch machine is 35Hz to obtain graphite powder;

[0034] (2) After mixing the obtained graphite powder with the catalyst, vacuumize and heat and stir at 150°C for 1h, the vacuum degre...

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Abstract

The invention discloses a method for preparing a high-capacity graphite cathode material of a lithium ion battery and relates to the field of cathode materials of lithium ion batteries. The method comprises the following steps: preparing graphite powder; mixing the graphite powder with a catalyst; and performing graphitization treatment, so as to obtain graphitized powder, namely the high-capacitygraphite cathode material of the lithium ion battery. A high-capacity graphite cathode prepared by using a catalytic graphitization method has a capacity of 360mAh / g or greater, the problem that as acathode, graphite is low in capacity, can be effectively alleviated, use requirements can be met, and the method is simple in process condition, controllable in preparation condition and applicable to large-scale production and development.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a preparation method of graphite negative electrode materials for high-capacity lithium ion batteries. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, strong adaptability, long service life, good safety performance and environmental protection, and are especially favored in the field of new energy materials. Lithium-ion batteries are composed of positive electrodes, negative electrodes, separators and electrolytes. The negative electrode material is one of the key factors affecting the capacity of lithium-ion batteries, so it has always been the focus of research in the field of new energy materials. Artificial graphite has high specific capacity, cycle performance, low-temperature charge and discharge performance, and high cost performance. Therefore, it has become the main raw ma...

Claims

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Application Information

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IPC IPC(8): C01B32/205H01M4/587H01M10/0525
CPCC01B32/205H01M4/587H01M10/0525Y02E60/10
Inventor 王建
Owner 内蒙古瀚璞科技发展有限公司
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