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Crystal silicon dioxide/carbon porous composite material and preparation method thereof

A technology of porous composite materials and amorphous silica, which is applied in the field of molten salt electrochemistry, can solve the problems affecting the electrolytic reaction rate and achieve the effect of small resistivity

Active Publication Date: 2015-11-04
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the porosity and pore size of the cathode can affect the O 2- Diffusion rate, which in turn affects the rate of the entire electrolytic reaction

Method used

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  • Crystal silicon dioxide/carbon porous composite material and preparation method thereof
  • Crystal silicon dioxide/carbon porous composite material and preparation method thereof
  • Crystal silicon dioxide/carbon porous composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Mix the flux and dispersant with a mass ratio of 5% to form a uniform solution: the flux is NaCl, analytically pure; the dispersant is deionized water; it is carried out in a planetary mixer. Mix silicon dioxide with a mass ratio of 57% and the above solution to form a uniform silicon dioxide sol: the silicon dioxide is prepared by a gas phase method with a particle size of 30±5nm and a purity of ≥99.5% in a planetary mixer . The carbon with a mass ratio of 38% is uniformly mixed with the above-mentioned silica sol, and the carbon is lithium-ion battery negative electrode material 918, and the D90 is 28.0-34.0 μm; it is carried out in a planetary mixer. The mixed slurry was dried in an oven at 100° C. for 24 h, and crushed into powder. The mixed powder is pressed into a mold under uniaxial pressure. The compact is sintered under an inert protective atmosphere: the protective atmosphere is argon; the sintering temperature is 900° C.; the holding time is 3 hours, and th...

Embodiment 2

[0043] Mix the flux and dispersant with a mass ratio of 10% to form a uniform solution: the flux is NaCl, analytically pure; the dispersant is deionized water; it is carried out in a planetary mixer. Mix silicon dioxide with a mass ratio of 54% and the above solution to form a uniform silicon dioxide sol: the silicon dioxide is prepared by a gas phase method, with a particle size of 30±5nm and a purity of ≥99.5%, and is carried out in a planetary mixer . The carbon with a mass ratio of 36% is uniformly mixed with the above-mentioned silica sol, and the carbon is lithium-ion battery negative electrode material 918, and the D90 is 28.0-34.0 μm; it is carried out in a planetary mixer. The mixed slurry was dried in an oven at 100° C. for 24 h, and crushed into powder. The mixed powder is pressed into a mold under uniaxial pressure. The compact is sintered under an inert protective atmosphere: the protective atmosphere is argon; the sintering temperature is 900° C.; the holding t...

Embodiment 3

[0049] Mix the flux and dispersant with a mass ratio of 5% to form a homogeneous solution: the flux is CaCl 2 , analytically pure; the dispersant is deionized water; carried out in a planetary mixer. Mix silicon dioxide with a mass ratio of 57% and the above solution to form a uniform silicon dioxide sol: the silicon dioxide is prepared by a gas phase method, with a particle size of 30±5nm and a purity of ≥99.5%; carried out in a planetary mixer . The carbon with a mass ratio of 38% is uniformly mixed with the above-mentioned silica sol, and the carbon is lithium-ion battery negative electrode material 518, and the D90 is 26.0-32.0 μm; it is carried out in a planetary mixer. The mixed slurry was dried in an oven at 100° C. for 24 h, and crushed into powder. The mixed powder is pressed into a mold under uniaxial pressure. The compact is sintered under an inert protective atmosphere: the protective atmosphere is argon; the sintering temperature is 1200° C.; the holding time i...

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Abstract

The invention discloses a crystal silicon dioxide / carbon porous composite material and a preparation method thereof. Three-dimensional network-shaped crystal silicon dioxide is evenly distributed on the surfaces of carbon particles, so that the crystal silicon dioxide / carbon porous composite material is formed. The silicon dioxide is tetragonal crystals and belongs to a P41212 space group, a=b=4.973, and c=6.924. The porosity of the crystal silicon dioxide / carbon porous composite material is 40%-80%, the peso-position hole diameter is 100-2000 nm, and the electrical resistivity is 0.10-80 ohmcm. The crystal silicon dioxide / carbon porous composite material comprises, by mass, 30%-90% of silicon dioxide and 10%-70% of carbon materials. The preparation method at least includes the following steps of mixing, forming and sintering. According to the step of mixing, the silicon dioxide particles, the carbon materials and a fluxing agent are evenly mixed, so that a powder-like mixture is obtained. According to the step of forming, the powder-like mixture is formed so that a porous block body can be obtained. According to the step of sintering, the obtained porous block body undergoes high-heat treatment in an inert atmosphere, and after the fluxing agent is removed, the three-dimensional network-shaped crystal silicon dioxide / carbon porous composite material is obtained.

Description

technical field [0001] The invention relates to a crystalline silicon dioxide / carbon porous composite material and a preparation method thereof, which can be used for electrolytically preparing silicon-carbon composite materials or silicon-carbon compounds, and belongs to the field of molten salt electrochemistry. Background technique [0002] Silica / carbon composites have the advantages of both, and have the ability to absorb waves, bioimaging, and dyes, and occupy a place in many fields such as optics, medicine, electricity, catalysis, and the environment. Preparation of silicon carbide material. [0003] In recent years, on the basis of silicon dioxide electrolytic reduction (FFC-Cambridge process) to silicon (nature materials, 2001, 2: 397-401), the patent document CN103107315A discloses a nano-silicon-carbon composite material and its preparation method, using Silicon / carbon composite materials were prepared by electrolysis of silica / carbon composite electrodes; Zhao e...

Claims

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Application Information

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IPC IPC(8): C25B1/00C25B11/03C25B11/04C30B29/18C30B29/02
Inventor 杨娟玉卢世刚康志君史碧梦王宁
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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