Silicon-containing composite material and its preparation method and application

A silicon composite material and content technology, which is applied in the treatment of dyed polymer organic compounds, structural parts, electrical components, etc., can solve problems such as increasing production costs, destroying product coating structures, and affecting the electrochemical performance of composite materials, and achieving environmental protection. The effects of less pollution, simplified production process, and excellent electrical conductivity

Active Publication Date: 2008-07-02
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This silicon / carbon composite material needs to be obtained through high-temperature carbonization treatment (generally at 900-1200°C), and the carbonization process also needs to be protected by an inert atmosphere. Higher temperature and inert gas protection bring great inconvenience to industrial production. It also greatly increases the cost of production
In addition, the above-mentioned products need to be crushed after high-temperature carbonization treatment, which will destroy the coating structure of the product, thereby affecting the electrochemical performance of the composite material.

Method used

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  • Silicon-containing composite material and its preparation method and application
  • Silicon-containing composite material and its preparation method and application
  • Silicon-containing composite material and its preparation method and application

Examples

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preparation example Construction

[0025] According to the preparation method of the silicon-containing composite material provided by the present invention, in order to make the polymerization reaction more uniform and the conductive polymer to coat the surface of the graphite particles more uniformly, the polymerization reaction and doping are preferably performed in the conductive polymer precursor. carried out in solution. The solution of the conductive polymer precursor contains an organic polymer precursor, an inorganic dopant and a solvent, and the concentration of the organic polymer precursor in the solution may be 0.1-10% by weight, preferably 1-5% by weight. The organic polymer precursor is a monomer substance that can act with an inorganic dopant to form a conductive polymer after polymerization. The organic polymer precursor can be, for example, one or more of aniline, pyrrole, thiophene, p-phenylenediamine, 3-butylthiophene, and benzene. Since aniline raw materials are cheap and easy to obtain, t...

Embodiment 1

[0039] This example is used to illustrate the silicon-containing composite material provided by the present invention and the preparation method thereof.

[0040] 0.5 g of nano-silicon (particle diameter of 20-50 nanometers) and 0.5 g of polyvinylpyrrolidone were added to 100 ml of a hydrochloric acid solution with a concentration of 1 mol / L, and the nano-silicon was uniformly dispersed by magnetic stirring. Then add 9.5 grams of artificial graphite (average particle diameter D 50 = 20.75 microns, crystallite spacing d 002 0.33688 nm), stir well. Then add 0.7 g of aniline, continue magnetic stirring for 30 minutes, and add 50 ml of a 1 mol / L hydrochloric acid solution containing 1.84 g of ammonium persulfate to the mixture dropwise to initiate the polymerization of aniline monomers, and the dropwise addition is completed in 1 hour. After the dropwise addition was completed, the mixture was filtered, washed, and dried at 80° C. after stirring for 3 hours to obtain blue-black ...

Embodiment 2

[0048] This example is used to illustrate the silicon-containing composite material provided by the present invention and the preparation method thereof.

[0049] 0.8 g of nano-silicon (particle diameter of 20-50 nanometers) and 0.8 g of polyvinylpyrrolidone were added to 100 ml of lithium chloride solution with a concentration of 1 mol / L, and the nano-silicon was uniformly dispersed by magnetic stirring. Then add 9.2 grams of artificial graphite (average particle diameter D 50 = 20.75 microns, crystallite spacing d 002 0.33688 nm), stir well. Then add 1.4 g of aniline, continue magnetic stirring for 30 minutes, add 50 ml of a 1 mol / L lithium chloride solution containing 3.68 g of ammonium persulfate into the mixture dropwise to initiate the polymerization of aniline monomer, and complete the dropwise addition in 1 hour. After the dropwise addition, the mixture was filtered, washed, and dried at 80° C. after stirring for 3 hours to obtain blue-black micropowder, that is, the...

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Abstract

The invention provides a siliceous composite material, comprising silicon particles, graphite particles and conducting polymer, wherein, the conducting polymer is wrapped on the surface of the graphite particles; at least part of the silicon particles is adhered to the surface of the conducting polymer. The siliceous composite material provided by the invention takes the conducting polymer as a clad material; the polymer does not need to be transformed further into 'hard carbon' and the siliceous composite material is guaranteed to have excellent conductivity; meanwhile, the aggregation between silicon particles can be avoided. When the composite material is taken as negative active material of a lithium iron battery, the lithium iron battery is guaranteed to have high reversible capacity and good cycle performance. Therefore, the invention can be used as the negative active material of the lithium iron battery. As the polymer does not need to be transformed further into the 'hard carbon' and the siliceous composite material has good conductivity in the preparation of the siliceous composite material provided by the invention, the manufacturing technique is simplified and the problem of huge energy consumption caused by the high temperature carbonization process in the prior art is solved.

Description

technical field [0001] The present invention relates to a silicon-containing composite material and its preparation method and application. Background technique [0002] At present, most commercial lithium-ion batteries use lithium transition metal oxide / graphite systems as negative electrode active materials. Although such systems have excellent electrochemical performance, their lithium storage capacity is low, especially the theory of carbon-based negative electrode active materials. The capacity is only 372 mAh / g, and such a low capacity is currently difficult to adapt to the miniaturization development of various portable electronic devices and the demand for large-capacity, high-power chemical power sources for electric vehicles. Therefore, a new anode active material with higher specific capacity is currently being studied to improve the performance of Li-ion batteries and meet the market demand. [0003] Research on non-carbon anode active materials has shown that t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L101/12C08K7/00C09C3/10H01M4/36C08K3/04C08K3/32C08K3/34C08L79/02C08L65/00
CPCY02E60/10
Inventor 梁善火沈菊林肖峰
Owner BYD CO LTD
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