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Silicon-based composite material, preparation method and application thereof

A silicon-based composite material and reaction technology, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of no improvement and control, and it is difficult to ensure product consistency, so as to achieve good structural stability and enhance electronic performance. Effects of conductive connectivity, improvement of hardness and bonding force

Inactive Publication Date: 2013-07-31
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The description of the polymerization process in CN101210119A and CN101210112A simply mixes nano-silicon and aniline monomer directly through physical stirring, and then directly polymerizes aniline in the mixed liquid. As for the coating effect, there is no improvement and control, so that even if composite materials are obtained, it is difficult to ensure the consistency of its products

Method used

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  • Silicon-based composite material, preparation method and application thereof
  • Silicon-based composite material, preparation method and application thereof
  • Silicon-based composite material, preparation method and application thereof

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preparation example Construction

[0027] According to the preparation method of the silicon-based composite material of the second aspect of the present invention, it is used to prepare the silicon-based composite material according to the first aspect of the present invention, comprising the following steps: using p-phenylenediamine (H 2 N-Ar-NH 2 ) under nitrite and acidic conditions, a diazotization reaction occurs to generate a diazonium salt; nano-silicon particles are added to the solution where the diazotization reaction is completed, and a substitution reaction is carried out to obtain a Si-C covalent bond. The nano-silicon precursor that the aniline monomer is connected to the surface of the nano-silicon particles; the nano-silicon precursor is added to the microemulsion formed by mixing the oil phase and the water phase to adjust the pH of the solution, and then the aniline monomer is added; the initiation of the aniline polymerization The polyaniline is added into the microemulsion to undergo anilin...

Embodiment 1

[0038] Prepare the precursor:

[0039] Add 20g of p-phenylenediamine into 500mL of 1mol / L HCl solution, and stir at 150rpm for 10min in a thermostat at 10°C;

[0040] 100mL5.797mol / L sodium nitrite (NaNO 2 ) solution was added dropwise to the above HCl solution at a speed of 10mL / min, and continued to stir at a speed of 150rpm for another 10min;

[0041] Add 3.54g of nano-silicon particles (D50, 40nm) to the above solution, stir at 300rpm for 10min, vacuum filter, and wash with tetrahydrofuran and ethanol, then wash with deionized water until oil-free, and then dry in a vacuum oven 6h, to obtain 3.70g precursor (diazotized nano-silicon particles, that is, the connection between silicon and aniline);

[0042] Prepare composite material:

[0043] Mix 20mL ethanol and 20mL deionized water evenly, mix 90mL cyclohexane and 10mL Tween 80 evenly, then mix the total volume of 40mL ethanol and deionized water (water phase) and 100mL cyclohexane and Tween 80 (oil Phase) was stirred ...

Embodiment 2

[0047] Prepare the precursor:

[0048] Add 10g p-phenylenediamine to 500mL1mol / L H 2 SO 4 In the solution, stir at 150rpm for 10min in a constant temperature bath at 10°C;

[0049] 50mL5.797mol / L sodium nitrite (NaNO 2 ) solution was added dropwise to the above H at a rate of 10mL / min 2 SO 4 solution, and continuously stirred at 150rpm for 10min;

[0050] Add 3.54g of nano-silicon particles (D50, 100nm) to the above solution, stir at 300rpm for 10min, vacuum filter, and wash with tetrahydrofuran and ethanol, then wash with deionized water until oil-free, and then dry in a vacuum box for 6h , to obtain 3.61g precursor.

[0051] Prepare composite material:

[0052] Mix 20mL ethanol and 20mL deionized water evenly, mix 90mL cyclohexane and 10mL Tween 80 evenly, then mix the total volume of 40mL ethanol and deionized water (water phase) and 100mL cyclohexane and Tween 80 (oil Phase) was stirred at a speed of 300rpm for 10min to form a microemulsion;

[0053] Add 2.8g of p...

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Abstract

The invention provides a silicon-based composite material, a preparation method and an application thereof. The silicon-based composite material comprises nanometer silicon particles and polyaniline cladding layers cladded on surface of the nanometer silicon particles, and Si-C covalent bonds are formed between the nanometer silicon particles and the polyaniline coating layers. The preparation method of the silicon-based composite material comprises carrying out a diazotization reaction of P-phenylenediamine (H2N-Ar-NH2) in the presence of nitrite under an acidic condition to generate diazonium salts; adding the nanometer silicon particles into a solution of a complete diazotization reaction for a replacement reaction to obtain nanometer silicon precursors with aniline monomers connected to the surfaces of the nanometer silicon particles through the Si-C covalent bonds; adding the nanometer silicon precursors into a microemulsion mixed from an oil phase and a water phase, adjusting a pH value of the solution, adding the aniline monomers; and adding an initiator enabling polymerization of the aniline into the microemulsion for an aniline polymerization reaction, thereby obtaining the silicon-based composite material with polyaniline-cladded nanometer silicon particles. The silicon-based composite material provided by the invention can improve a cladding effect.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a silicon-based composite material, a preparation method thereof, and an application thereof. Background technique [0002] At present, most of the electrodes of commercial lithium-ion batteries use lithium transition metal oxide / graphite system. Due to the low theoretical lithium intercalation capacity of graphite in this system, it is only 372mAh / g, and only by improving the battery design structure and manufacturing process It is also difficult to increase the energy density, so anode active materials with higher specific energy are required. In the field of negative electrode active materials for lithium-ion batteries, research on non-carbon negative electrode materials has emerged. Some elements (such as Al, Si, Sb, Sn, etc.) can alloy with metal lithium, have the ability to store lithium ions, and are reversible. The lithium intercalation capacity is much higher than t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/12H01M4/606H01M4/386H01M4/366H01M4/624Y02E60/10
Inventor 王娜
Owner DONGGUAN AMPEREX TECH
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