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Preparation method for monatomic silicon-graphene nanoribbon composite material

A technology of graphene nanobelts and composite materials, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of cycle stability and service life, and the combination of graphene and simple silicon is not tight , Simple silicon is easy to pulverize and fall off, etc., to achieve the effect of improving electrochemical performance, excellent rate performance, and low production cost

Active Publication Date: 2015-09-23
重庆锦添翼新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantages of this method are: 1. This method adopts the vapor phase deposition method, the output is low, the production cost is high, and it is not easy to popularize and apply
②This method uses silane silicon source, which is expensive and toxic, which is not conducive to mass production
③In this method, the temperature is high and the energy consumption is large, which is not conducive to energy saving and consumption reduction, and the practical application is limited
④ The product graphene obtained by this method is not tightly combined with the elemental silicon, which leads to the fact that the elemental silicon is still relatively easy to pulverize and fall off during the electrochemical reaction process, which affects the cycle stability and service life

Method used

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  • Preparation method for monatomic silicon-graphene nanoribbon composite material
  • Preparation method for monatomic silicon-graphene nanoribbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The concrete steps of a kind of preparation method of elemental silicon-graphene nanoribbon composite material are as follows:

[0028] 1) Preparation of elemental silicon suspension

[0029] Add the elemental silicon material into deionized water and stir for 3 hours to obtain a suspension of elemental silicon, the ratio of the mass (g) of elemental silicon: the volume of deionized water (mL) is 1:500, and then add glucose to the suspension After 90 minutes, a homogeneous elemental silicon suspension was prepared. The mass ratio of glucose to elemental silicon is 1:10.

[0030] 2) Preparation of graphene nanoribbons

[0031] 2.1) adding graphitized carbon nanotubes into concentrated sulfuric acid and stirring for 12 hours to prepare mixture I,

[0032] 2.2) Then, potassium permanganate was added to mixture I, stirred at room temperature for 1 hour, then transferred to a water bath, and then stirred at a constant temperature of 80° C. for 4 hours to obtain mixture II...

Embodiment 2

[0038] A kind of preparation method of elemental silicon-graphene nanoribbon composite material, with embodiment 1, wherein:

[0039] In the 1st step, the stirring time is 0.5h, the mass (g) of elemental silicon: the ratio of deionized water volume (mL) is 1: 100, and a binder is added for ultrasonication for 10min. The mass ratio is 1:0.1.

[0040]2) The transition metal oxidation aid is osmium tetroxide, and the concentrated sulfuric acid is a strong oxidizing acid. The graphitized carbon nanotubes are added to the strong oxidizing acid and the stirring time is 1h, and the stirring time is 0.1h at room temperature. The temperature is 50° C., and the stirring time in a water bath is 1 h; the mass (g) of the carbon nanotube: the mass (g) of the oxidizing agent: the volume (mL) of the oxidizing acid is 1:1:50. Add hydrogen peroxide and deionized water in the mixture II, the mixed reaction time is 0.5h; the volume of the hydrogen peroxide (mL): the volume of the deionized water...

Embodiment 3

[0043] A kind of preparation method of elemental silicon-graphene nanoribbon composite material, with embodiment 1, wherein:

[0044] In step 1), the stirring time is 12h, the mass (g) of elemental silicon: the ratio of deionized water volume (mL) is 1:1000, and the binder is added for ultrasonication for 300min. The mass of the binder and elemental silicon The ratio is 1:50.

[0045] 2) The transition metal oxidation aid is potassium ferrate, and perchloric acid is a strong oxidizing acid. The graphitized carbon nanotubes are added to the strong oxidizing acid and the stirring time is 24 hours. The stirring time is 5 hours at room temperature. The temperature is 90°C, and the stirring time in a water bath is 1-10 h; the mass (g) of the carbon nanotube: the mass (g) of the oxidizing agent: the volume (mL) of the oxidizing acid is 1:10:2000. Add hydrogen peroxide and deionized water to the mixture II, and the mixing reaction time is 3h; the volume of the hydrogen peroxide (mL)...

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Abstract

A preparation method for a monatomic silicon-graphene nanoribbon composite material comprises the following steps of: firstly, uniformly mixing monatomic silicon and an adhesion agent to form a monatomic silicon suspension liquid; secondly, adding grapheme nanoribbons prepared from carbon nanotubes through chemical cutting and ultrasonic exfoliation to the monatomic silicon suspension liquid; and thirdly, performing ultrasound mixing to prepare a monatomic silicon-graphene nanoribbon colloid, and drying and heating the colloid to prepare a composite cathode material product. The preparation method has the characteristics of simplicity in process, convenience in operation, low energy consumption, low production cost and the like, is conducive to production at a large scale and is convenient to promote and apply. The monatomic silicon-graphene nanoribbon composite material prepared according to the method of the invention has the characteristics of high binding force, excellent electrical conductivity, fast ion diffusion speed, long recycle service life and the like. The method can be widely used for preparing a pure metal composite material. The product prepared according to the method of the invention can be widely used as an anode material applied to a high-performance lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanocomposite materials, and in particular relates to a method for preparing simple silicon-graphene nanoribbon composite materials in the field of nanocomposite materials. Background technique [0002] In recent years, lithium-ion batteries have become a research hotspot due to their high energy density, fast charging and discharging speed, no memory effect, and long service life. At present, lithium-ion batteries generally use graphite as their negative electrode material, but the low specific capacity of graphite (theoretical capacity 372mAh / g) severely limits the performance of lithium-ion batteries. Due to its large specific capacity (theoretical capacity up to 4200mAh / g), silicon is considered to be the most promising material to replace graphite as the negative electrode of the next generation of new lithium-ion batteries. However, silicon has a serious volume effect during the char...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 李新禄李同涛粟泽龙张艳艳张欣琳黄佳木
Owner 重庆锦添翼新能源科技有限公司
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