High-capacity rapid charge graphite negative electrode material and preparation method thereof

A graphite negative electrode, high-capacity technology, applied to battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of no optimal combination of raw materials, poor fast charging performance, and inability to meet high-rate fast charging, etc.

Active Publication Date: 2019-05-14
HUNAN SHINZOOM TECH
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Problems solved by technology

[0003] People usually use particle design and surface modification methods to further improve the fast charging performance. The common ideas are as follows: ① The carbon material is crushed to a certain particle size, and the secondary granulation is achieved by kneading, and finally a secondary particle is obtained by graphitization The structure of graphite anode material; the defect of this structure is that it is difficult to balance capacity and fast charging performance. If you choose easy graphitization raw materials, the capacity can be guaranteed but the fast charging performance is poor; if you choose difficult graphitization raw materials, the fast charging performance is relatively poor. Good but low capacity; after graphitization treatment, the particle surface is highly ordered, which also has a great negative impact on fast charging performance
②The carbon material is pulverized to a certain particle size, and finally carbonized through surface modification to obtain a graphite anode material with a primary particle structure; the defect of this structure is that it is difficult to increase the capacity without graphitization treatment, although surface modification can reduce The interface impedance improves the fast charging performance, but due to the long diffusion path of the primary particle structure, it has a certain negative impact on the fast charging performance
[0004] Patent document 201410784385.5 discloses a fast-charging graphite lithium-ion battery negative electrode material and its preparation method. After mixing natural graphite and pitch - kneading - high-temperature graphitization treatment, a composite graphite material with a secondary particle structure is obtained. Natural graphite is selected as the raw material capacity Easy to guarantee but can not meet the high rate fast charge
[0005] Patent document 201410787061.7 discloses a fast-charging graphite lithium-ion battery negative electrode material and its preparation method. Petroleum coke/pitch coke and pitch are mixed-kneaded-high-temperature graphitization to obtain an artificial graphite material with a secondary particle structure. Due to the petroleum coke / Pitch coke is not the artificial graphite raw material with the highest capacity, nor is it the artificial graphite raw material with the best fast charging performance,

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  • High-capacity rapid charge graphite negative electrode material and preparation method thereof
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  • High-capacity rapid charge graphite negative electrode material and preparation method thereof

Examples

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[0036] Example 1

[0037] Needle coke and hard-graphitized petroleum coke are powdered, spheroidized, classified, and then mixed. The mixing ratio is 95:5 by mass percentage to obtain carbon fine powder with an average particle size of 12 μm. The obtained carbon micropowder is mixed with petroleum pitch (residual carbon value 10%, softening point 40° C., β resin content 5%), and the pitch mixing ratio is 1% by mass percentage to obtain a mixed precursor. The mixed precursor was compounded in the reactor, the stirring speed was 100 rpm, the heating temperature was 400 ℃, and the heating time was 2 h, to obtain a composite precursor, the volatile content of the composite precursor was 8%. The composite precursor was thrown into a roller compaction mechanical mill for crushing, and at the same time extremely large particles were removed to obtain a crushed precursor with an average particle size of 18 μm. Carry out high temperature graphitization of the broken precursor, heating te...

Example Embodiment

[0038] Example 2

[0039] The natural graphite and the hard-graphitized pitch coke are respectively pulverized, spheroidized, and classified, and then mixed. The mixing ratio is 90: 10 by mass percentage to obtain carbon fine powder with an average particle size of 10 μm. The obtained carbon micropowder is mixed with petroleum pitch (residual carbon value 70%, softening point 350°C, β resin content 50%), and the pitch mixing ratio is 10% by mass percentage to obtain a mixed precursor. The mixed precursor is compounded in a reactor, with a stirring speed of 50 rpm, a heating temperature of 500° C., and a heating time of 4 h to obtain a composite precursor with a volatile content of 6%. The composite precursor is thrown into a roller compaction mechanical mill for crushing, while removing extremely large particles to obtain a crushed precursor with an average particle diameter of 16 μm. Carry out high-temperature graphitization of the broken precursor with a heating temperature of...

Example Embodiment

[0040] Example 3

[0041] Easily graphitized petroleum coke and difficult-graphitized pitch coke are respectively pulverized, spheroidized, and classified, and then mixed. The mixing ratio is 80:20 by mass percentage to obtain carbon fine powder with an average particle size of 3 μm. The obtained carbon micropowder is mixed with petroleum pitch (residual carbon value 30%, softening point 150°C, β resin content 10%), and the pitch mixing ratio is 40% by mass percentage to obtain a mixed precursor. The mixed precursor was compounded in a reactor, with a stirring speed of 5 rpm, a heating temperature of 200° C., and a heating time of 6 hours to obtain a composite precursor with a volatile content of 4%. The composite precursor is thrown into a roller compaction mechanical mill for crushing, while removing extremely large particles, to obtain a crushed precursor with an average particle size of 5 μm. The broken precursor is subjected to high-temperature graphitization, the heating t...

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Abstract

The invention provides a preparation method of a high-capacity rapid charge graphite negative electrode material. According to the method, easily-graphitized coke/high-crystallinity graphite and difficultly-graphitized coke/hard carbon are secondarily granulated, asphalt is mixed to perform composite reaction, mixture is crushed after the composite reaction, the crushed mixture is graphitized, andthe graphitized mixture is modified and carbonized. The negative electrode material prepared by the method takes secondary granules serve as a core, the surfaces of the negative electrode material are wrapped by double layers, and the negative electrode material has the advantages of high capacity and good rapid charge performance and solves the problem that the capacity and rapid charge performance cannot be taken into account in the prior art.

Description

technical field [0001] The invention relates to a carbon material and a preparation method thereof, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Graphite anode material has the characteristics of high energy density, good cycle performance, mature preparation technology, and low manufacturing cost. It is the mainstream commercial anode material for lithium-ion batteries; In order to meet the higher requirements, it is generally hoped to improve the fast charging ability at room temperature and low temperature, so that the graphite anode material must be specially designed and processed to meet the fast charging requirements. [0003] People usually use particle design and surface modification methods to further improve the fast charging performance. The common ideas are as follows: ① The carbon material is crushed to a certain particle size, and the secondary granulation is achieved by knea...

Claims

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Application Information

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IPC IPC(8): C04B35/532H01M4/36H01M4/587H01M10/0525
CPCY02E60/10
Inventor 胡孔明佘英奇贺志远皮涛王志勇邵浩明余梦泽
Owner HUNAN SHINZOOM TECH
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