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A kind of graphite negative electrode material and its preparation method and application

A technology of graphite anode and graphite particles, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of low specific capacity, inability to meet high-capacity and high-power lithium-ion batteries, etc., and achieve improved conductivity, good rate and Cyclic performance, effect of improving structural stability

Active Publication Date: 2022-04-08
湖南金阳烯碳新材料股份有限公司
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  • Application Information

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Problems solved by technology

The anode materials of lithium-ion batteries in related technologies are mainly carbon materials, mainly including natural graphite and artificial graphite. Natural graphite has the advantages of high capacity and high compaction. However, at present, the anode materials for large-scale commercial use of lithium-ion batteries are mainly carbon materials, including natural graphite, artificial graphite, etc., but in fact its theoretical specific capacity is low, about 300mAh / g , unable to meet the needs of high-capacity and high-power lithium-ion batteries

Method used

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  • A kind of graphite negative electrode material and its preparation method and application
  • A kind of graphite negative electrode material and its preparation method and application

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Embodiment 1

[0084] The present embodiment is a preparation method of a graphite negative electrode material, comprising the following steps:

[0085] S1. Add 10g carbon fiber (Beijing Merida Technology Co., Ltd., carbon nanofiber, diameter: 150nm~200nm; length: 10μm~30μm) to 100mL 0.1mol / L amino coupling agent (KH550) solution, at 110°C After reacting for 2 hours, the solid-liquid separation was performed, and the amino-modified carbon fiber was obtained after freeze-drying;

[0086] 10g of the first particle graphite ((Shanghai Macklin Biochemical Technology Co., Ltd., article number: G810739, 750 mesh to 850 mesh (about 18μm))) and 10g of the second particle graphite (Shanghai Macklin Biochemical Technology Co., Ltd., article number: G810365 , 8000 mesh (1.6μm)) were added to 100mL oxidant solution (sodium persulfate solution with a mass fraction of 5%), oxidized at 65°C for 20h, and freeze-dried after solid-liquid separation to obtain the first graphite oxide particles and a second pa...

Embodiment 2

[0103] This embodiment is a method for preparing a graphite negative electrode material, and the difference from Embodiment 1 is that the mass of the second particle graphite in this embodiment is 20 g.

Embodiment 3

[0105] This example is a method for preparing a graphite negative electrode material, and the difference from Example 1 is that the mass percentage of sodium persulfate in this example is 6%.

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Abstract

The present invention discloses a graphite negative material and its preparation methods and applications. The negative electrode material includes carbon fiber, which is connected to graphite particles of carbon fiber chemical bonds; carbon coating layers cover the carbon fiber and graphite granules.; Titanium nitride layer, the carbon coating layer of the titanium nitride layer is covered; the graphite particles include the first granular graphite particles and the second granular graphite particles, whichThe diameter is greater than the particle size of the graphite particles.The negative electrode material of the present invention uses the combination of the first granules and the second granular graphite, and uses more electrolytes to store more electrolytes to enhance the long cycle life of the negative material.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a graphite negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are mainly composed of transition metal oxides with lithium-intercalated positive electrode materials, highly graphitized carbon as negative electrode materials, separator polyolefin microporous membranes, and electrolyte materials. [0003] Compared with traditional lead-acid, nickel-cadmium, nickel-metal hydride and other secondary batteries, lithium-ion secondary batteries have high working voltage, small size, light weight, high capacity density, no memory effect, no pollution, self-discharge Small size and long cycle life. The anode materials of lithium-ion batteries in related technologies are mainly carbon materials, mainly including natural graphite and artificial graphite. Natural graphite has the advantages of high c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/587H01M4/66H01M4/80H01M10/0525
CPCH01M4/587H01M4/624H01M4/628H01M4/663H01M4/806H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 刘建忠邹武刘思王恒段元兴郝志理陈亮
Owner 湖南金阳烯碳新材料股份有限公司
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