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Silicon-containing composite material and its preparation method and application

A silicon composite material and content technology, applied in the treatment of dyed polymer organic compounds, structural parts, electrical components, etc., can solve the problems of affecting the electrochemical performance of composite materials, destroying the coating structure of products, increasing production costs, etc., to achieve excellent Electrical conductivity, simplified production process, less environmental pollution

Active Publication Date: 2010-12-08
BYD CO LTD
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  • Summary
  • 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 to make the conductive polymer more uniformly coated on the surface of the graphite particles, the polymerization reaction and doping are preferably performed on the surface of the conductive polymer precursor. 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 can be 0.1-10% by weight, preferably 1-5% by weight. The organic polymer precursor is a monomer substance capable of reacting with an inorganic dopant to form a conductive polymer after polymerization. The organic polymer precursor may be, for example, one or more of aniline, pyrrole, thiophene, p-phenylenediamine, 3-butylthiophene, and benzene. Because the aniline raw material is che...

Embodiment 1

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

[0040] Add 0.5 g of nano-silicon (with a particle diameter of 20-50 nm) and 0.5 g of polyvinylpyrrolidone into 100 ml of hydrochloric acid solution with a concentration of 1 mol / liter, and magnetically stir to disperse the nano-silicon evenly. Then add 9.5 grams of artificial graphite (average particle diameter D 50 = 20.75 microns, crystallite layer spacing d 002 0.33688 nanometers), stir well. Then add 0.7 gram of aniline, continue magnetic stirring for 30 minutes, then drop 50 milliliters of 1 mol / liter hydrochloric acid solution containing 1.84 grams of ammonium persulfate into the mixture to initiate the polymerization of the aniline monomer, and complete the addition in 1 hour. After the dropwise addition, the mixture was stirred for 3 hours, filtered, washed, and dried at 80° C. to obtain a blue-black micropowder, that is,...

Embodiment 2

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

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

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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 capacityand 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 invention relates to a silicon-containing composite material and its preparation method and application. Background technique [0002] Most of the current commercialized lithium-ion batteries use lithium transition metal oxide / graphite system as the negative electrode active material. The capacity is only 372 mAh / g. Such a low capacity is currently difficult to meet the miniaturization development of various portable electronic devices and the demand for large-capacity and high-power chemical power sources for electric vehicles. Therefore, a new negative electrode active material with higher specific capacity is currently being studied to improve the performance of potassium-ion batteries and meet market demand. [0003] Studies on non-carbon negative electrode active materials have shown that there are many metals or alloys with high lithium storage performance that may be used as negative electrode active materials. Among them, silicon has a lar...

Claims

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Application Information

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Patent Type & Authority Patents(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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