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Carbon composite material, and preparation method and application thereof

A carbon composite material and slurry technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of uneven coating of the coating layer, imperfect carbon composite material morphology, and unsatisfactory coating effect, etc. The effect of improving low temperature performance and improving high current discharge performance

Inactive Publication Date: 2011-05-11
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of uneven coating of the coating layer of the carbon composite material prepared in the prior art, unsatisfactory coating effect, and the imperfect appearance of the prepared carbon composite material, the present invention provides a more perfect appearance, Cladding coats more uniform carbon composites

Method used

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  • Carbon composite material, and preparation method and application thereof
  • Carbon composite material, and preparation method and application thereof
  • Carbon composite material, and preparation method and application thereof

Examples

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preparation example Construction

[0027] The present invention further provides a method for preparing the above-mentioned carbon composite material, the steps comprising:

[0028] a. Add graphite to the carbon-coated precursor aqueous solution, and mix the slurry;

[0029] b, the slurry obtained in step a is subjected to hydrothermal treatment, and then dried;

[0030] c. heat-treating the product obtained in step b under an inert atmosphere or vacuum condition, and the heat treatment includes carbonization treatment and graphitization treatment. The prepared material has a more perfect shape, a more uniform covering layer, easier control of the particle size of the material, and better high-current performance of the material. Further preferred steps include

[0031] a. Add graphite to the carbon-coated precursor aqueous solution, and mix the slurry;

[0032] b, the slurry obtained in step a is subjected to hydrothermal treatment, and then dried;

[0033] c, the product obtained in step b is subjected to...

Embodiment 1

[0050] (1) Carbon composite materials

[0051] 250 g of sucrose was dissolved in water, and stirred thoroughly for 1 hour to prepare an aqueous solution of sucrose with a mass concentration of 5 wt%. The average particle size is 12.3μm, the interlayer distance (d002) is 1000g of domestic natural flake graphite (fixed carbon content 99.5%) with a particle size distribution of 3.1-35.2 μm was slowly added to a 5wt% sucrose solution, and then fully stirred for 5 hours to obtain a uniform slurry.

[0052] The slurry was transferred to an autoclave, subjected to a hydrothermal dehydration treatment at 190° C. and 500 rpm for 5 hours under a pressure of 15 mPa, washed and dried to obtain a black powder.

[0053] Put the black powder obtained above into the 2 In a protected high-temperature furnace, the temperature was raised to 1000°C at a rate of 120°C / h, and kept at a temperature of 6 hours, and then naturally cooled to room temperature to obtain a black powder.

[0054] Put t...

Embodiment 2

[0061] The carbon composite material and simulated battery were prepared by the same method as in Example 1, except that the precursor solution was 5% carboxymethyl cellulose aqueous solution.

[0062] The average particle size of the prepared carbon composite material was measured by the same method as in Example 1 to be 12.5 μm. Layer spacing (d002) is The specific surface area is 2.31m 2 / g.

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Abstract

The invention provides a carbon composite material. The carbon composite material comprises a core part and a shell part, wherein the core part comprises graphite; the shell part comprises amorphous carbon; the average grain diameter is 8 to 20 mu m; and the interlamellar spacing specific surface area is 0.3 to 2.5 m<2> / g. The invention also provides a preparation method of the carbon composite material. The preparation method comprises the following steps of: a, adding the graphite into aqueous solution of a carbon-coated precursor and mixing pulp uniformly; b, performing hydro-thermal treatment on the pulp obtained in the step a and the drying; and c, performing heat treatment on a product obtained in the step b under an inert atmosphere or a vacuum condition, wherein the heat treatmentcomprises carbonizing treatment and graphitizing treatment. In the carbon composite material prepared by the method, the appearance is more perfect; a coating layer is coated more uniformly; the grain diameter is controlled more easily; and the big current property is higher. The invention further provides application of the carbon composite material to a lithium battery as a cathode.

Description

technical field [0001] The invention relates to a carbon composite material, its preparation method and application. Background technique [0002] Graphite materials have the advantages of low discharge platform, high theoretical capacity (372mAh.g-1) and high charge and discharge efficiency, and are widely used as active materials for energy storage devices. However, due to the high degree of crystallization and orientation of graphite materials, it is easy for solvent molecules to co-intercalate with lithium ions into the graphite layer during the charging process, causing the graphite layer to peel off, which leads to the degradation of the cycle performance of lithium-ion batteries. and carbon atoms on the surface of graphite have a large number of unsaturated bonds, and the electrolyte will decompose on the surface of graphite to form an SEI (solid electrolyte interface) film during the first charge, making the first irreversible capacity larger and reducing the cycle e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/00C01B31/02H01M4/38
CPCY02E60/10
Inventor 刘雄风王圣
Owner SHANGHAI BYD
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