High-rate lithium ion battery graphite cathode material and preparation method thereof

A lithium-ion battery and graphite negative electrode technology, applied in battery electrodes, secondary batteries, hybrid capacitor electrodes, etc., can solve the problems of limited rate performance improvement, blocked lithium ion channels, limited economic value, etc., to achieve high first efficiency and high capacity Large, stable product effect

Inactive Publication Date: 2019-03-08
KEDA (ANHUI) NEW MATERIAL CO LTD
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  • Abstract
  • Description
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Problems solved by technology

At present, there are also many researches on the technology of graphite modification treatment. For example, Chinese patent CN104362344A obtains expanded graphite through concentrated acid oxidation treatment and then agglomerates and granulates. The obtained graphite material has improved low-temperature performance, but its rate performance is limited. Moreover, the strong acid environment has high requirements on the equipment, and the economic value is limited; the patent CN108199043A obtains high-magnification graphite negative electrode materials through the surface oxidation treatment and then the secondary granulation process, but the microporous structure produced during the oxidation process is not easy to be obtained in the subsequent secondary granulation During the process, it is easy to be filled by the formed amorphous carbon, blocking some lithium ion channels, which may eventually affect its increase in rate.

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  • High-rate lithium ion battery graphite cathode material and preparation method thereof

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Effect test

Embodiment 1

[0029] Preparation method of high rate graphite negative electrode material:

[0030] (1) Crushing and shaping of raw materials: crushing and shaping the needle coke until the particle size D50 is 4-8 μm;

[0031] (2) Graphitization: carry out graphitization high-temperature treatment at 2900° C. for 48 hours on the crushed and shaped material in step (1);

[0032] (3) demagnetization screening: the graphitized sample of step (2) is demagnetized and screened, and the screening adopts a 100-300 mesh vibrating screen;

[0033] (4) Liquid-phase coating granulation: Mix the sieved material with binder and solvent uniformly at a certain ratio at room temperature, then add it to a fusion machine (rotating speed 500 rpm, time 20 minutes) for treatment, and place Carbonization treatment in a carbonization furnace, the carbonization temperature and time are 800 ° C, 4 hours; the material accounts for 80% of the total mass; the binder is petroleum pitch, the solvent is n-hexane, and it...

Embodiment 2

[0037] Preparation method of high rate graphite negative electrode material:

[0038] (1) Crushing and shaping of raw materials: crushing and shaping the needle coke until the particle size D50 is 4-8 μm;

[0039] (2) Graphitization: carry out graphitization high-temperature treatment at 3000° C. for 48 hours on the crushed and shaped material in step (1);

[0040] (3) demagnetization screening: the graphitized sample of step (2) is demagnetized and screened, and the screening adopts a 100-300 mesh vibrating screen;

[0041] (4) Liquid-phase coating granulation: mix the sieved material with binder and solvent uniformly at a certain ratio at room temperature, add it to a fusion machine (800 rpm, 40 minutes) for processing, and place Carbonization treatment in a carbonization furnace, the carbonization temperature and time are 1000 ° C, 4 hours; the material accounts for 90% of the total mass; the binder is phenolic resin, the solvent is ethanol, and its mass ratio is 1:4, acco...

Embodiment 3

[0045] Preparation method of high rate graphite negative electrode material:

[0046] (1) Crushing and shaping of raw materials: crushing and shaping the petroleum coke until the particle size D50 is 4-8 μm;

[0047] (2) Graphitization: carry out graphitization high-temperature treatment at 3100° C. for 48 hours on the crushed and shaped material in step (1);

[0048] (3) demagnetization screening: the graphitized sample of step (2) is demagnetized and screened, and the screening adopts a 100-300 mesh vibrating screen;

[0049] (4) Liquid-phase coating granulation: mix the sieved material with binder and solvent uniformly at a certain ratio at room temperature, add it to a fusion machine (800 rpm, 40 minutes) for processing, and place Carbonization treatment in a carbonization furnace, the carbonization temperature and time are 1000 ° C, 2 hours; the material accounts for 90% of the total mass; the binder is phenolic resin, the solvent is ethanol, and its mass ratio is 1:3, acc...

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Abstract

The invention belongs to the field of lithium ion batteries, and particularly relates to a high-rate lithium ion battery graphite cathode material and a preparation method thereof. The preparation method comprises the following steps: (1) pulverization and shaping of raw materials; (2) graphitization; (3) demagnetization screening; (4) liquid phase coating granulation; (5) surface oxidation treatment. According to the high-rate lithium ion battery graphite cathode material and the preparation method thereof, a liquid phase coating granulation process replaces traditional secondary granulationthrough optimized fine graphite, so as to realize uniform coating of the surface of graphite, reduce the anisotropism of the graphite and shorten the diffusion path of lithium ions; then a micro porestructure is formed on the surface of the graphite through a surface oxidization pore formation process, so that a lithium ion migration channel of a cardinal plane is added to increase the migrationspeed of lithium ions. The charging rate of the graphite obtained by the method is more than 8 C, and the capacity can be maintained at 80 percent or above under the discharging rate more than 30 C.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a high-rate lithium ion battery graphite negative electrode material and a preparation method thereof. Background technique [0002] As a new generation of green and environmentally friendly batteries, lithium-ion batteries have the advantages of high specific energy, wide application temperature range, good cycle stability, no pollution, and good safety performance. They are widely used in mobile phones, notebook computers, and power tools. However, as the requirements for small, convenient and short-time charging of various products continue to increase, the requirements for fast charging performance of lithium-ion batteries are also increasing. At present, the development and improvement of lithium-ion anode materials is the key to improving its fast charging performance. Therefore, the development of lithium-ion anode materials with high-rate fast-charging cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205H01M4/587H01M10/0525H01G11/34
CPCC01B32/205H01G11/34H01M4/587H01M10/0525Y02E60/10
Inventor 陈伟梅海龙龙伟冷九够付健曾冬青戴涛
Owner KEDA (ANHUI) NEW MATERIAL CO LTD
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