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Preparation method of high-rate graphite anode material, anode material and lithium-ion battery

A graphite negative electrode and high-rate technology, applied in the field of materials, can solve the problems that affect the initial efficiency of the full battery energy density, the increase of the material specific surface area, etc.

Active Publication Date: 2016-06-01
江西紫宸科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the patent CN103682282A is to load metal and / or metal compounds on graphite; the graphite loaded with catalyst is reacted with reaction gas to obtain graphite negative electrode material with porous structure. Although the material prepared by this method can increase carbon material However, the specific surface area of ​​the material increases, which affects the initial efficiency and the energy density of the full battery.

Method used

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  • Preparation method of high-rate graphite anode material, anode material and lithium-ion battery
  • Preparation method of high-rate graphite anode material, anode material and lithium-ion battery
  • Preparation method of high-rate graphite anode material, anode material and lithium-ion battery

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Embodiment 1

[0041] Embodiment 1 of the present invention provides a kind of preparation method of high rate graphite negative electrode material, such as figure 1 shown, including the following steps:

[0042] Step 11, mixing 60wt%-98wt% carbon material, 0.01wt%-25wt% binder and 0.01wt%-15wt% conductive agent to prepare slurry;

[0043] Specifically, the particle size of the carbon material is 0.5 μm to 10 μm, including one of natural graphite, artificial graphite, graphite powder, mesocarbon microspheres, petroleum coke, pitch coke, needle coke, coke, soft carbon or hard carbon. one or more species.

[0044] The binder includes one or more of pitch, resin, and cellulose. Wherein, the resin may include: phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, epoxy resin, unsaturated resin, polyurethane, polyimide and the like. Cellulose may include: methylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, and the like.

[0045] The co...

Embodiment 2

[0063] The high-magnification graphite negative electrode material prepared by the method provided in the above-mentioned embodiment 1 can be used for lithium ion battery negative electrode material, figure 2 A schematic diagram of the structure of the graphite anode material is shown in .

[0064] The material A shown in the figure includes: one or more combinations of natural graphite, artificial graphite, graphite powder, mesocarbon microspheres, petroleum coke, pitch coke, needle coke, coke, soft carbon or hard carbon; The microscopic morphology has a typical layered structure, and the layer spacing is between 0.3nm and 0.4nm; this part is the main contributor to the capacity of the negative electrode material;

[0065] The particle size distribution (D50) of the substance A is 0.5 μm to 15 μm, preferably 1 μm to 10 μm. The shape of substance A is one or more of spherical, ellipsoidal, pebble-shaped and irregular polygons; the selection of small particle size is to reduc...

Embodiment 3

[0077] Embodiment 3 of the present invention provides a specific method for preparing a high-rate graphite negative electrode material.

[0078] 78.36wt% of natural graphite, 21.46wt% of epoxy resin, 0.09wt% of carbon black, and 0.09wt% of carbon nanotubes were mixed to prepare a slurry, and the slurry was spray-dried and granulated or extruded and kneaded to granulate, To obtain particles with a particle size of 20 μm, place the particles in a rotary sintering furnace, raise the temperature from room temperature to 750 °C at a rate of 2.5 °C / min, sinter in an inert atmosphere, keep the temperature for two hours, and then cool to room temperature to obtain sintered The final block material; after the block material is broken up, soak it with liquid pitch, repeat sintering and soaking twice, and then break it down to a particle size of 20 μm; then carry out graphitization treatment at 3100 ° C to obtain high-magnification graphite Negative material.

[0079] The graphite negat...

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Abstract

The invention discloses a preparation method of a high-rate graphite anode material, the anode material and a lithium-ion battery. The method comprises the following steps: mixing a carbon material, an adhesive and a conductive agent to prepare slurry; carrying out spray drying granulation or extruding kneading granulation on the slurry to obtain particles of which the particle sizes are 5-30 microns; putting the particles into a rotary sintering furnace, carrying out sintering in an inert atmosphere, carrying out heat preservation for 2 hours and cooling the particles to a room temperature to obtain a bulk material; scattering the bulk material into the particles of which the particle sizes are 5-30 microns; and impregnating the scattered material with liquid asphalt or resin, putting the impregnated material into the rotary sintering furnace, sintering the impregnated material in the inert atmosphere, scattering the obtained material into the particles of which the particle sizes are 5-30 microns again, and carrying out graphitization at 3,000-3300 DEG C to obtain the high-rate graphite anode material.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a preparation method of a high-rate graphite negative electrode material, the negative electrode material and a lithium ion battery. Background technique [0002] Among the current commercial lithium-ion battery anode materials, carbon anode materials include graphite, soft carbon and hard carbon. In terms of gram capacity, graphite has the highest capacity, with a theoretical capacity of 372mAh / g, and the current actual capacity is as high as 360mAh / g. Above, it is precisely because of the advantages of high capacity, good intercalation / delithiation reversibility, low potential platform, and excellent cycle performance that carbon materials are the main negative electrode materials for 3C electronic products and have been widely used. [0003] However, lithium ions can only enter and exit the graphite layer structure from the edge of the graphite layer, that is, the direction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/583H01M10/0525H01M2004/027H01M2220/20H01M2220/30Y02E60/10
Inventor 罗飞刘柏男张志清李辉刘芳冯苏宁陈卫
Owner 江西紫宸科技有限公司
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