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Isotropous graphite secondary particle, and preparation method and use thereof

A secondary particle, isotropic technology, used in electrical components, battery electrodes, circuits, etc., can solve the problems of low compaction density of graphite anode materials, poor rapid charge and discharge performance, electrode structure damage, etc. Charge and discharge performance, improve the use of compaction density, the effect of easy production

Active Publication Date: 2013-02-13
内蒙古杉杉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is to overcome that the existing graphite particles are easy to form an orientation parallel to the current collector. During the repeated charge and discharge process of the lithium ion battery, the c-axis direction of the graphite will change when lithium ions enter and exit the interior of the graphite crystal. Generate large strain, lead to the destruction of the electrode structure, affect the cycle performance, and make the rapid charge and discharge performance worse, thereby providing an isotropic graphite secondary particle and its preparation method and use
The graphite secondary particle of the present invention is macroscopically isotropic, and using this isotropic graphite secondary particle as the lithium ion battery negative electrode material can maintain the mass specific capacity of the prior art lithium ion battery graphite negative electrode material, At the same time, solve the problem of low compaction density of graphite negative electrode materials caused by graphite crystal anisotropy and large baking expansion rate after compaction, thereby improving the volume specific capacity of lithium-ion batteries

Method used

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  • Isotropous graphite secondary particle, and preparation method and use thereof
  • Isotropous graphite secondary particle, and preparation method and use thereof
  • Isotropous graphite secondary particle, and preparation method and use thereof

Examples

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Embodiment 1

[0050] Raw materials: needle-shaped petroleum coke powder, average particle size 3-5μm; coal-based modified asphalt particles, average particle size 90-94μm, softening point 135-145°C, coke analysis value 55-65%; Fe 2 o 3 , with an average particle size of 3 μm.

[0051] Preparation method: 10 parts (volume) of needle-shaped petroleum coke powder, 2 parts (volume) of coal-based modified bitumen particles and 6wt% Fe 2 o 3 (Based on the total weight of needle-shaped petroleum coke powder and coal-based modified asphalt particles) mixed at room temperature for 40 minutes to obtain a mixed powder in which the needle-shaped petroleum coke powder is the continuous phase and the coal-based modified asphalt particles are the dispersed phase; Put the mixed powder into the mold, pass through the KJYW255-450 type warm isostatic press, and treat it at 120°C and 80MPa pressure for 30 minutes, take it out and cool it to room temperature, and use an air classifier to remove excess as carb...

Embodiment 2

[0061] Raw materials: needle-shaped petroleum coke powder, average particle size 3-5μm; coal-based modified asphalt particles, average particle size 90-94μm, softening point 135-145°C, coke analysis value 55-65%; Fe 2 o 3 , with an average particle size of 3 μm.

[0062] Preparation method: 10 parts (volume) of needle-shaped petroleum coke powder, 2 parts (volume) of coal-based modified bitumen particles and 6wt% Fe 2 o 3 (Based on the total weight of petroleum coke powder and coal-based modified pitch particles) mixed at room temperature for 40 minutes to obtain a mixed powder in which needle-shaped petroleum coke powder was the continuous phase and coal-based modified pitch particles were the dispersed phase; Put the mixed powder into the mold, pass through the KJYW255-450 type warm isostatic press, and treat it at 80°C and 80MPa pressure for 30 minutes, take it out and cool it to room temperature, and use an air classifier to remove the excess as the initial carbon materi...

Embodiment 3

[0064] Raw materials: needle-shaped petroleum coke powder, average particle size 3-5μm; coal-based modified asphalt particles, average particle size 90-94μm, softening point 135-145°C, coke analysis value 55-65%; Fe 2 o 3 , with an average particle size of 3 μm.

[0065] Preparation method: 10 parts (volume) of needle-shaped petroleum coke powder, 2 parts (volume) of coal-based modified bitumen particles and 6wt% Fe 2 o 3(Based on the total weight of needle-shaped petroleum coke powder and coal-based modified asphalt particles) mixed at room temperature for 40 minutes to obtain a mixed powder in which the needle-shaped petroleum coke powder is the continuous phase and the coal-based modified asphalt particles are the dispersed phase; Put the mixed powder into the mold, pass through the KJYW255-450 type warm isostatic press, and treat it at 300°C and 80MPa pressure for 30 minutes, take it out and cool it to room temperature, and use an air classifier to remove excess as carbo...

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Abstract

The invention relates to a preparation method of an isotropous graphite secondary particle. The preparation method comprises the following steps: 1, mixing initial carbon material particles with modified asphalt particles to obtain a powder mixture with the initial carbon material particles as a continuous phase and the modified asphalt particles as a dispersion phase; 2, carrying out hot isothermal pressing treatment of the powder mixture, and removing the initial carbon material particles unbonded by the modified asphalt to obtain an isotropous graphite secondary particle precursor; and 3, sequentially carrying out heat treatments comprising non-melting treatment, charring treatment and graphitization treatment of the isotropous graphite secondary particle precursor. The isotropous graphite secondary particle macroscopically has the isotropy, can maintain the specific mass capacity of a cathode material, and simultaneously solves problems comprising low compacted density of a graphite cathode material piece and large baking expansion rate after the compacting of the piece, so the specific volume capacity of a lithium ion battery is improved.

Description

technical field [0001] The invention relates to an isotropic graphite secondary particle, a preparation method and application thereof. Background technique [0002] At present, the commercialized carbon materials for negative electrodes of lithium-ion batteries mainly include natural graphite and artificial graphite. It is widely used because of its high charge and discharge capacity, good charge and discharge platform, wide source of raw materials, and low production cost. [0003] With the continuous improvement of the preparation technology of lithium-ion battery anode graphite materials, its discharge capacity has reached or approached that of LiC 6 The theoretical value of 372mAh / g. In order to prepare high-capacity lithium-ion batteries, on the premise of maintaining the mass-specific capacity of lithium-ion battery negative electrode carbon materials in the prior art, improving its volume-specific capacity has become a research hotspot. [0004] As we all know, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 李杰乔永民池淑芬丁晓阳吴志红杜辉玉吴敏昌张华
Owner 内蒙古杉杉科技有限公司
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