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A kind of preparation method of pomegranate structure composite material

A composite material and pomegranate technology, applied in nanotechnology, structural parts, electrical components, etc. for materials and surface science, can solve problems such as increased electrode ion transmission resistance, consumption of silicon materials and electrolytes, and decreased electrical conductivity , to achieve the effect of good mechanical support, high conductivity and low cost

Inactive Publication Date: 2016-09-28
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive SEI film growth results in lower Coulombic efficiency, which increases the ion transport resistance of the entire electrode and reduces conductivity until the electrolyte or silicon alloy electrode in the battery is exhausted.
[0004] Disadvantages of silicon nanoparticles as a negative electrode material: During charge and discharge, a layer of SEI film will be formed on the surface of the active material, which is formed by consuming silicon material and electrolyte
On this basis, Liu et al. further designed a pomegranate-structured silicon-carbon anode material (such as figure 1 b), the interconnected carbon network skeleton structure in the material further improves the electrical conductivity of the electrode material, and exhibits excellent electrochemical performance in electrochemical tests, but this preparation method is too complicated

Method used

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  • A kind of preparation method of pomegranate structure composite material
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  • A kind of preparation method of pomegranate structure composite material

Examples

Experimental program
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Embodiment 1

[0050] The preparation of embodiment 1 class pomegranate structure composite material

[0051] The experimental steps are as follows: 100 mg of polyacrylonitrile (PAN) was dissolved in 4 ml of N,N-dimethylformamide (DMF), stirred and heated to dissolve to form a polyacrylonitrile solution. After the polyacrylonitrile is completely dissolved, weigh 60 mg of silicon nanoparticles and pour them into the polyacrylonitrile solution, ultrasonically disperse for 10 min, and then magnetically stir for 6 h ( image 3 a). After the silicon powder is fully dispersed in the polyacrylonitrile solution, add excess deionized water while stirring, the polyacrylonitrile solution will emulsify when it meets water, and form a cement-like solid together with the silicon powder. Remove the cement-like precursor ( image 3 b), into a ceramic crucible.

[0052] In a vacuum atmosphere, use a tube furnace at a heating rate of 10 °C / min to heat the obtained precursor at 1000 °C for 2 h, then cool do...

Embodiment 2

[0054] Example 2 Battery Preparation and Battery Assembly

[0055] The pomegranate-like structure composite material in Example 1, conductive agent (Super P carbon black) and binder (sodium alginate water-based binder) are evenly stirred according to the ratio of 8:1:1 and then coated on the copper foil , with a thickness of 50 μm. Put it into a vacuum drying oven and dry it at 100°C (about 2h). After taking it out, cut the copper foil coated with the electrode material into pieces. The diameter of the punch of the cutting machine is 11.6mm. After pressing the pieces, put them into a vacuum drying oven and dry them at 100°C (about 3h). Prepare the working electrode.

[0056] Assembly of the battery: the metal lithium sheet is used as the counter electrode, the porous polypropylene film is used as the separator, and a 1mol L -1 The mixed solution of ethylene carbonate and dimethyl carbonate of lithium hexafluorophosphate was used as the electrolyte (volume ratio 1:1), and a ...

Embodiment 3

[0058] Structural characterization of embodiment 3 class pomegranate structure composite material

[0059] Figure 4 It is a low-magnification scanning electron microscope (SEM) photo of the prepared pomegranate-like structure silicon-carbon lithium-ion battery electrode material. The particle morphology of hollow pomegranate-like structure composite samples can be seen from the low-magnification SEM images. Figure 4 b shows the distribution of sample particles in a certain range. It can be seen from the figure that the ground sample particles are not regular, but the particle size has a certain span. In addition to some sample particles with larger diameters, there are some fine particles at the bottom. Generally, the size of the sample particles is between 1-50 μm. Figure 4 a is a slightly higher magnification scanning electron microscope image, showing the whole picture of a single sample particle. As can be seen from this figure, the particle diameter of this sample ...

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Abstract

The invention discloses a pomegranate-like structured composite material preparation method which comprises the following steps: S1, taking a polyacrylonitrile solution, adding silica nanoparticles, and fully dispersing; S2, adding deionized water after stirring for emulsification to obtain a mud like precursor; S3, heating the mud like precursor obtained in the S2, and annealing to obtain a solid composite; and S4, grinding the solid composite obtained in the S3 into micron particles, adding a hydrogen fluoride solution for corrosion for a certain period of time, washing hydrogen fluoride, and drying to obtain a pomegranate-like structured composite material. According to the method, polyacrylonitrile is used for coating the silica particle surface, the polyacrylonitrile is emulsified when meeting water, so that the coated silicon particles are agglomerated, the coated silicon particles are carbonized and ground for formation of the pomegranate shaped structured silicon carbon composite material, HF is used for direct corrosion of the silicon nanoparticles in the material for preparation of the hollow pomegranate-like structured composite material, and detailed structure characterization and electrochemical performance testing of the material show that the material is good in performances.

Description

technical field [0001] The invention relates to the preparation of negative electrode materials, and more specifically, to a preparation method of a pomegranate-like structure composite material. Background technique [0002] Electrochemical energy storage has become a key technology in many applications and electronic products, such as electric vehicles, portable electronic devices, mobile power stations, etc. Lithium-ion batteries have become one of the more promising energy storage devices due to their high energy density and good rate characteristics. As the demand of the electronics industry continues to increase, its requirements for power equipment are also getting higher and higher. Therefore, it is necessary to develop electrode materials with higher capacity, low cost, and mass production to improve the energy density of batteries and realize energy storage in lithium-ion batteries. ability to improve. [0003] Alloy anode materials such as silicon, tin, germaniu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62B82Y30/00H01M10/0525
CPCB82Y30/00H01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 王成新庞春雷宋华伟崔浩
Owner SUN YAT SEN UNIV
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