Preparation method for carbon cathode material of lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of complex process and inability to achieve large-scale coating, achieve simple production process, reduce irreversible capacity loss, particle shape and Effect of Surface Condition Improvement

Inactive Publication Date: 2013-10-09
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

[0004] The purpose of the present invention is to provide a production method for lithium-ion battery carbon negative electrode materials, which overcomes the shortcomings that the surface treatment process of negative electrode materials cannot achieve large-scale coating or the process is too complicated, and obtains high-solid-content asphalt through deep polymerization. Asphalt achieves a high proportion of coating, ultimately improving the electrical performance of lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 300 grams of ethylene residue was polymerized at 420° C. for 360 minutes, and the mesophase content of the system was observed under a polarizing microscope to reach 25%, the reaction was terminated, and raw material A was obtained by crushing after cooling.

[0016] Weigh 100 grams of raw material A, 400 grams of natural graphite B, and 300 grams of solvent oil C.

[0017] The above three raw materials were mixed and dissolved at 200°C for 120 minutes. The temperature was then raised to 450°C and maintained under vigorous stirring for 240 minutes. Continue to slowly raise the temperature to 600°C, maintain it for 180 minutes, and carry out graphitization at a temperature of 2700°C.

[0018] A button battery was used for testing, and the first discharge capacity of the obtained negative electrode material was 355mAh / g, and the first discharge efficiency was 95%. 90% capacity was maintained after 300 cycles.

Embodiment 2

[0020] 300 grams of modified asphalt was polymerized at 430°C for 180 minutes. The mesophase content of the system was observed under a polarizing microscope to reach 40%. The reaction was terminated, and raw material A was obtained by crushing after cooling.

[0021] Weigh 100 grams of raw material A, 200 grams of artificial graphite B, and 600 grams of washing oil C.

[0022] The above three raw materials were mixed and dissolved at 200°C for 120 minutes. The temperature was then raised to 440°C and maintained under vigorous stirring for 180 minutes. Continue to slowly raise the temperature to 600°C and maintain it for 150 minutes. Graphitization is carried out at a temperature of 2800°C.

[0023] A button battery was used for the test, and the first discharge capacity of the obtained negative electrode material was 335mAh / g, the first discharge efficiency was 96%, and the capacity remained 91.5% after 300 cycles.

Embodiment 3

[0025] 300 grams of medium-temperature asphalt was polymerized at 450°C for 180 minutes, and the mesophase content was observed under a polarizing microscope to reach 70%, the reaction was terminated, and raw material A was obtained by crushing after cooling.

[0026] Weigh 140 grams of raw material A, 60 grams of petroleum coke powder B, and 700 grams of pyridine solvent C.

[0027] The above three raw materials were mixed and dissolved at 200°C for 120 minutes. The temperature was then raised to 450°C and maintained under vigorous stirring for 240 minutes. Continue to slowly raise the temperature to 500°C and maintain it for 210 minutes. Carbonization treatment is carried out at a temperature of 900°C, and graphitization treatment is carried out at a temperature of 2900°C.

[0028] A button battery was used for the test, and the first discharge capacity of the obtained negative electrode material was 340mAh / g, the first discharge efficiency was 96%, and the capacity remain...

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Abstract

The invention provides a preparation method for a carbon cathode material of a lithium ion battery. The method comprises the following steps of: performing polyreaction on petroleum asphalt or coal pitch used as a raw material at the temperature of 400-460 DEG C; at the later stage of reaction, sampling and observing by use of a polarizing microscope; when the system interphase content reaches 20-80%, terminating the reaction; cooling and then smashing so as to obtain a raw material A; preparing a raw material B from powdered carbon, natural graphite powder, artificial graphite powder or a mixture thereof, wherein the average grain diameter of any of the powdered carbon, the natural graphite powder and the artificial graphite powder is 10-25 mu m; preparing a raw material C from organic solvents such as heavy oil, absorber oil and anthracene oil; mixing the raw material A, the raw material B and the raw material C at a temperature of 150-200 DEG C according to the condition that A/B is equal to (5-70)/(30-95) or (A+B)/C is equal to (20-70)/(30-80); then performing thermal treatment at a temperature of 400-600 DEG C while stirring; and finally performing carbonizing treatment and graphitization treatment. The carbon cathode material prepared by the preparation method provided by the invention has the advantages of high capacity and long cycle life.

Description

technical field [0001] The invention relates to a production method of a lithium ion battery carbon negative electrode material, belonging to the technical field of lithium ion battery negative electrode materials. Background technique [0002] In recent years, lithium-ion batteries have been used more and more widely. During the development of lithium-ion battery technology, battery quality has been continuously improved and production costs have been continuously reduced. Anode materials have played a large role in the contribution to the technological progress of lithium-ion batteries. Obtaining high-quality and low-cost anode materials through surface treatment has become one of the main directions in the development of anode materials, and great progress has been made in practice. Although there are many practical methods for surface treatment, there is still great potential for technological development in this area. [0003] Lithium-ion battery anode materials are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62
CPCY02E60/10
Inventor 叶涛蔡奉翰王丽琼
Owner 大连宏光锂业有限责任公司
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