Graphite anode material for lithium ion batteries and preparation method thereof

A lithium-ion battery, graphite negative electrode technology, applied in the direction of battery electrodes, graphite, chemical instruments and methods, etc., can solve the problems of poor fast charging performance of artificial graphite, poor fast charging performance, large cycle expansion, etc., to improve fast charging performance , low cost, high efficiency for the first time

Inactive Publication Date: 2017-03-22
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of lithium-ion battery graphite negative electrode material to overcome the defects of existing artificial graphite such as poor fast charging performance, poor low temperature performance, and large cycle expansion.
[0004] The object of the present invention is also to provide the graphite negative electrode material of lithium ion battery prepared by the above method, to overcome the defects of existing artificial graphite such as poor fast charging performance, poor low temperature performance, and large cycle expansion.

Method used

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  • Graphite anode material for lithium ion batteries and preparation method thereof
  • Graphite anode material for lithium ion batteries and preparation method thereof
  • Graphite anode material for lithium ion batteries and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0037] First, the petroleum coke is pulverized, and the true density of petroleum coke is 1.5g / cm 3 , the volatile content is 5%, and the specific surface area is 3.8m 2 / g, the ash content was 1.0%, and the particle diameter D50 after pulverization was 10.2 μm. Then, the pulverized petroleum coke and petroleum asphalt are coated and modified according to the mass ratio of 94:6. The coating modification temperature is: from 30°C to 500°C, the heating rate is 3°C / min, and the temperature is constant at 500°C 2h. Then, the coated and modified material is subjected to graphitization treatment, and the graphitization treatment temperature is 2800°C. Then, the graphitized material was screened with 300 meshes, and then fused with petroleum pitch at a mass ratio of 95:5. The fused frequency was 30 Hz, and the fused time was 10 minutes. Then carry out vacuum carbonization treatment, the temperature of vacuum carbonization treatment is: start from 30°C to 1300°C, the heating rate i...

Embodiment 2

[0039] First, the petroleum coke is pulverized, and the true density of petroleum coke is 1.5g / cm 3 , the volatile content is 5%, and the specific surface area is 3.8m 2 / g, the ash content was 1.0%, and the particle diameter D50 after pulverization was 10.2 μm. Then, the pulverized petroleum coke and petroleum asphalt are coated and modified according to the mass ratio of 94:6. The coating modification temperature is: from 30°C to 500°C, the heating rate is 3°C / min, and the temperature is constant at 500°C 2h. Then, the coated and modified material is subjected to graphitization treatment, and the graphitization treatment temperature is 3000°C. Then, the graphitized material was screened with 300 meshes, and then fused with petroleum pitch at a mass ratio of 95:5. The fused frequency was 25 Hz, and the fused time was 15 minutes. Then carry out vacuum carbonization treatment, the temperature of vacuum carbonization treatment is: start from 30°C to 1300°C, the heating rate is...

Embodiment 3

[0041] First, the petroleum coke is pulverized, and the true density of petroleum coke is 1.5g / cm 3 , the volatile content is 5%, and the specific surface area is 3.8m 2 / g, the ash content is 1.0%, and the particle diameter D50 after pulverization is 8.0 μm. Then, the pulverized petroleum coke and petroleum asphalt are coated and modified according to the mass ratio of 92:8. The coating modification temperature is: from 30°C to 500°C, the heating rate is 3°C / min, and the temperature is constant at 500°C 2h. Then, the coated and modified material is subjected to graphitization treatment, and the graphitization treatment temperature is 2800°C. Then, the graphitized material was screened with 300 meshes, and then fused with petroleum pitch at a mass ratio of 94:6. The fused frequency was 35 Hz, and the fused time was 10 minutes. Then carry out vacuum carbonization treatment, the temperature of vacuum carbonization treatment is: start from 30°C to 1300°C, the heating rate is 2...

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Abstract

The invention discloses a graphite anode material for lithium ion batteries and a preparation method thereof. The method comprises the following steps: 1) carrying out smashing treatment on petroleum coke; 2) carrying out cladding modification treatment on petroleum coke powder obtained in the step 1) and asphalt 1; 3) carrying out graphitization treatment on a material obtained in the step 2); 4) carrying out sieving treatment on a material obtained in the step 3); 5) carrying out fusion treatment on a material obtained in the step 4) and asphalt 2; 6) carrying out vacuum carbonization treatment on a material obtained in the step 5); and 7) carrying out sieving treatment on a material obtained in the step 6), thus obtaining a finished product. The graphite anode material for the lithium ion batteries disclosed by the invention is excellent in quick charge performance, relatively high in discharge capacity and first-time charge and discharge efficiency, relatively good in cycle performance and relatively good in low-temperature performance, the quick charging rate of the graphite anode material reaches more than 3 C, the first-time discharge capacity of the graphite anode material is more than 350 mAh/g, the first-time charge and discharge efficiency of the graphite anode material is more than 92%, and the 500-week cycle capacity retention ratio of the graphite anode material is more than 90%.

Description

technical field [0001] The invention relates to the field of lithium ion battery production, in particular to a lithium ion battery graphite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery, that is, a rechargeable battery. It mainly relies on lithium ions to move between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. The anode material of lithium-ion batteries is generally graphite anode material, which is the representative of modern high-performance batteries. Due to its high energy density, long cycle life, and no memory effect, lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587C01B32/20C01B32/205
CPCH01M4/587Y02E60/10
Inventor 张华娄文君李虹苗荣荣吴志红乔永民吴仙斌
Owner SHANGHAI SHANSHAN TECH CO LTD
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