Carbon composite material and its preparing method and use

A technology of carbon composite materials and carbon materials, applied in the field of electrochemistry, can solve the problems of poor stability of material batches, incomplete coating, and poor effects

Inactive Publication Date: 2006-08-23
HUIYU SCI & TECH LOUDI CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after the carbon material is coated, the coated carbon material will be separated from the natural graphite matrix during the subsequent crushing and processing, resulting in poor coating effect and poor stability of the material batch

Method used

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  • Carbon composite material and its preparing method and use

Examples

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Effect test

preparation example Construction

[0016] In the preparation method of the carbon composite material of the present invention, step (1) involves impregnation of natural graphite. The natural graphite used in this step is not limited in any way, including but not limited to flaky natural graphite, spherical or potato-shaped natural graphite. The polymers used in this step are free radical polymers or polycondensation polymers, including but not limited to polypropylene, polyethylene, polystyrene, polymethacrylates, polyvinyl chloride, polyacrylonitrile, nitrile rubber , styrene-butadiene rubber, polyphenylene, polynaphthalene, phenolic resin, urea-formaldehyde resin, epoxy resin and their copolymers; the polymer solution used in this step can be aqueous solution, alcohol solution or other organic compounds corresponding to the polymer The solvent solution is preferably an aqueous solution or an ethanol solution in terms of cost; the concentration of the polymer solution is not particularly specified, mainly beca...

Embodiment 1

[0026] 100 g of the carbon composite material coated for the first time obtained in Comparative Example 1 and 100 g of a 20% phenolic resin aqueous solution were stirred and mixed at room temperature for 6 hours, and then dried at 150° C. to remove water. The mixture after water removal was placed in a tube furnace, heat-treated at 800° C. for 12 hours under a nitrogen atmosphere, cooled, and pulverized to obtain a carbon composite material coated for the second time. The composite material can be used as negative electrode material of lithium ion battery.

[0027] The preparation of the negative electrode and the testing of its electrochemical performance were the same as those in Comparative Example 1 except that the carbon composite material coated for the second time obtained in this example was used as the negative electrode material. The relationship between capacity retention and cycle number is shown in figure 1 . The figure shows that the capacity retention was 93% af...

Embodiment 2

[0029] 100 g of the carbon composite material coated for the first time obtained in Comparative Example 1 and 100 g of a 20% phenolic resin aqueous solution were stirred and mixed at room temperature for 6 hours, and then dried at 150° C. to remove water. The mixture after water removal was placed in a tube furnace, heat-treated at 800° C. for 12 hours under a nitrogen atmosphere, cooled, and pulverized to obtain a carbon composite material coated for the second time. The composite material can be used as negative electrode material of lithium ion battery.

[0030] The preparation of the negative electrode and the testing of its electrochemical performance were the same as those in Comparative Example 1 except that the carbon composite material coated for the second time obtained in this example was used as the negative electrode material. The relationship between capacity retention and cycle number is shown in figure 1 . The graph shows that the capacity retention was 96% a...

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Abstract

The present invention belongs to the field of electrochemical technology, and is especially twice or multiple coated composite carbon material and its preparation and application. The composite carbon material is prepared with natural graphite, and through coating reaction for many times with carbon material to reach coating rate of 100 %. It may be used in producing negative electrode of lithium ion cell, and the electrode can avoid the insertion of solvent molecule and possesses excellent circulating performance. The preparation process has high operation performance, high repeatability and high product quality.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and specifically relates to a carbon composite material and its preparation method and application. Specifically, the invention relates to a composite carbon prepared by coating natural graphite with carbon material twice or more times material, and the application of the material as an anode material for a lithium-ion battery. Background technique [0002] As we all know, due to the specific layered structure of carbon materials, lithium ions can be reversibly intercalated and deintercalated; at the same time, the potential of lithium intercalation and deintercalation is not much different from that of metal lithium, so it can be used as a negative electrode material for lithium ion batteries (such as Wu Yuping, et al., "Lithium Ion Secondary Batteries", Chapter Three, pages p86-112, 2002, Chemical Industry Press; Wu Yuping, "Lithium Ion Batteries-Application and Practice", Chapter Thre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/536H01M4/36
CPCY02E60/12Y02E60/10
Inventor 吴宇平
Owner HUIYU SCI & TECH LOUDI CITY
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