Artificial graphite composite negative electrode material for lithium ion battery as well as preparation method and application of artificial graphite composite negative electrode material

A lithium-ion battery, artificial graphite technology, applied in battery electrodes, graphite, negative electrodes and other directions, can solve the problems of not significantly improving the overall performance of artificial graphite negative electrode materials, artificial graphite separation, low rate, etc., to achieve high capacity, phase Good capacitance and good rate performance

Pending Publication Date: 2022-06-07
GUANGDONG DONGDAO NEW ENERGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw materials for preparing artificial graphite are mainly raw coke and calcined coke. The artificial graphite obtained after graphitization of green coke has good rate performance, but low capacity. The artificial graphite obtained after graphitization of calcined coke has high capacity, but low rate property.
In order to solve the above problems, in the existing technology, raw coke and calcined coke are respectively crushed, classified and screened to obtain D 50 Coke powder with a small particle size of 5-8 μm, and then the raw coke powder and the calcined coke powder are bonded together through the secondary granulation technology, and finally the composite artificial graphite material is prepared by graphitization treatment, but it will be damaged during the charging and discharging process. The separation of the two artificial graphites did not significantly improve the comprehensive performance of the artificial graphite anode material

Method used

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  • Artificial graphite composite negative electrode material for lithium ion battery as well as preparation method and application of artificial graphite composite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (a) coke the oil-based needle coke (D 50 is 10mm) calcined at a high temperature of 850 ° C for 6 hours, cooled to obtain shallow calcined coke; then crushed in an impact pulverizer, shaped and sieved to obtain an average particle size D 50 5μm coke powder.

[0051] (b) the coke powder obtained in step (a) and pitch (softening point of 150° C., residual carbon value of 56%) are uniformly mixed at a weight ratio of 100:25 and then put into the granulation reaction kettle, and put into the granulation reaction kettle. 2 Heating to 550°C under protection, the stirring speed in the kettle is 30r / min, and the heating and heating program is: use a heating rate of 1.5°C / min to raise the temperature to 300°C, and keep the temperature constant for 30 minutes; The temperature was increased to 550°C at a heating rate of 3.0°C / min, and the temperature was maintained for 6 hours. Then, it was cooled to room temperature and sieved to obtain secondary particles with an average parti...

Embodiment 2

[0054] (a) coke the oil-based needle coke (D 50 15mm) calcined at a high temperature of 950°C for 6 hours, cooled to obtain shallow calcined coke; then crushed in an impact pulverizer, shaped and sieved to obtain coke powder with an average particle size D50 of 5μm.

[0055] (b) the coke powder obtained in step (a) and pitch (softening point of 180° C., residual carbon value of 60%) are uniformly mixed in a weight ratio of 100:20 and then put into the granulation reaction kettle, and placed in a N 2 Heating to 600°C under protection, the stirring speed in the kettle is 35r / min, and the heating and heating program is: use a heating rate of 1.5°C / min to raise the temperature to 300°C, and keep the temperature constant for 30 minutes; 0.8°C / min. The temperature was raised to 600°C at a heating rate of 3.0°C / min, and the temperature was maintained for 4 hours. Then, it was cooled to room temperature and sieved to obtain secondary particles with an average particle diameter D50 of...

Embodiment 3

[0058] (a) coke the oil-based needle coke (D 50 is 20mm) calcined at a high temperature of 1050 ° C for 6 hours, cooled to obtain shallow calcined coke; then crushed in an impact pulverizer, shaped and sieved to obtain an average particle size D 50 5μm coke powder.

[0059] (b) the coke powder obtained in step (a) and pitch (softening point of 220° C., carbon residue value of 62%) are uniformly mixed at a weight ratio of 100:15 and then put into the granulation reaction kettle, and then put into the granulation reactor. 2 Heating to 650°C under protection, the stirring speed in the kettle is 40r / min, and the heating and heating program is: use a heating rate of 1.5°C / min to raise the temperature to 300°C, and keep the temperature constant for 30 minutes; The temperature was raised to 650°C at a heating rate of 2.0°C / min, and the temperature was maintained for 3 hours. Then, it was cooled to room temperature and sieved to obtain secondary particles with an average particle di...

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Abstract

The invention provides an artificial graphite composite negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: (1) calcining green coke at a high temperature of 800-1200 DEG C, and cooling to obtain shallow calcined coke; (2) crushing and shaping the shallow calcined coke obtained in the step (1) to obtain coke powder; (3) mixing the coke powder obtained in the step (2) with asphalt, and granulating to obtain secondary particles; (4) carrying out graphitization treatment on the secondary particles obtained in the step (3), and then scattering and screening to obtain screened materials; and (5) carrying out carbon coating treatment on the screened material obtained in the step (4) to obtain the artificial graphite composite negative electrode material. The graphite negative electrode material prepared by the method is used for the lithium ion battery, has high capacity and high magnification at the same time, and is simple in preparation process and relatively high in practicability.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to an artificial graphite composite negative electrode material for lithium ion batteries and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have a series of advantages such as high specific capacity, high operating voltage, good safety, and no memory effect, and are widely used in notebook computers, mobile phones, and instrumentation lamps and many other portable electronic equipment. With the popularization of new energy vehicles, its application scope has expanded to electric vehicles and other fields. In recent years, with the increasing requirements for miniaturization, light weight, multi-function, and long-term driving of electronic products and automotive and energy storage equipment, the requirements for high energy density, high rate performance and long cycle life of lithium-ion batteries are increa...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M10/0525C01B32/21
CPCH01M4/366H01M4/583H01M10/0525C01B32/21H01M2004/027Y02E60/10
Inventor 刘明东叶雨佐吴其修
Owner GUANGDONG DONGDAO NEW ENERGY
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