Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Silicon/graphene composite material, and preparation method and application of the same

A composite material and graphene technology, applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., to achieve the effect of improving low specific capacity and high degree of practicality

Inactive Publication Date: 2012-06-13
INST OF CHEM CHINESE ACAD OF SCI
View PDF1 Cites 39 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common mechanical mixing and heat treatment processes cannot effectively achieve the uniform mixing of silicon nanoparticles and graphene.
In addition, the silicon / graphene film obtained by guiding the assembly of silicon nanoparticles and graphene oxide through filtration has the problem that the film is too thick to limit the rapid diffusion of lithium ions.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Silicon/graphene composite material, and preparation method and application of the same
  • Silicon/graphene composite material, and preparation method and application of the same
  • Silicon/graphene composite material, and preparation method and application of the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]The mass ratio of silicon nanoparticles: graphite oxide is mixed in a ratio of 4: 1, and water is used as a dispersion solvent, wherein the mass percentage concentrations of silicon nanoparticles and graphite oxide in the aqueous dispersion are 0.4% and 0.1%, respectively, It was ultrasonically mixed at a power of 40 kHz in a water bath for 0.3 h to obtain a uniform graphite oxide-silicon nanoparticle mixed solution. The solution was freeze-dried at -70°C for 24 hours, and the resulting freeze-dried powder was raised from room temperature to 700°C at a rate of 2°C / min under nitrogen protection, and then cooled to room temperature at a rate of 10°C / min after constant temperature for 2 hours. . Add the above materials into 10% hydrofluoric acid aqueous solution for immersion for 3 hours, then wash and dry with ethanol. A silicon / graphene composite material is thus obtained.

[0027] Characterization of silicon / graphene composites:

[0028] The morphology and size of the...

Embodiment 2

[0035] According to the mass ratio of silicon nanoparticles: graphite oxide, it is mixed in the ratio of 10:1, water is used as the dispersion solvent, the mass percent concentration of silicon nanoparticles and graphite oxide in the aqueous dispersion is 1% and 0.1%, freeze-dried The temperature in the step was replaced with -60°C, and then the silicon / graphene composite material was prepared according to the same method as in Example 1, except that the reduction temperature was 500°C, and the constant temperature time was 3h.

[0036] The positive pole, negative pole, electrolyte and battery assembly of simulated battery are identical with embodiment 1, and the composition of gained silicon / graphene composite material and the test result of simulated battery are listed in Table 1, and scanning electron microscope photograph is as follows Figure 5 shown. The apparent form of the silicon / graphene composite material is particles, the interior is a pore structure, and the parti...

Embodiment 3

[0038] According to the ratio of 0.2:1 mass ratio of silicon nanoparticles: graphite oxide, water is used as the dispersion solvent, and the mass percent concentrations of silicon nanoparticles and graphite oxide in the aqueous dispersion are 0.1% and 0.5%, respectively, freeze-dried The temperature of the step is replaced by -10°C, and then the silicon / graphene composite is prepared by the same method as in Example 1, except that the reduction temperature is 800°C, the constant temperature time is 1h, and the concentration is 10% by mass. Immerse in hydrofluoric acid aqueous solution for 0.5h.

[0039] The positive electrode, negative electrode, electrolyte and battery assembly of the simulated battery are the same as in Example 1, and the composition of the obtained silicon / graphene composite material and the test results of the simulated battery are listed in Table 1. The apparent form of the silicon / graphene composite material is particles, the interior is a pore structure...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Discharge capacityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a silicon / graphene composite material, and a preparation method and an application of the same. The preparation method comprises the following steps of: ultrasonically mixing silicon source and graphite oxide to be uniform in water, performing freeze drying to obtain freeze-dried powder, and then, placing the powder in non-oxidizing atmosphere for performing a reduction reaction, after the reduction reaction, obtaining the silicon / graphene composite material. The method can form the composite material by two steps, and templates are not needed, so that the method has high practicability, the obtained silicon / graphene composite material collects the advantages of a graphite-based composite material and a porous material, and the problems of low specific capacity, poor circulation property and discharge capability and low coulombic efficiency caused by taking a silicon-based material as the cathode material of a lithium ion battery are resolved.

Description

technical field [0001] The invention relates to a silicon / graphene composite material and its preparation method and application. Background technique [0002] Lithium-ion batteries have become ideal power sources for portable electronic devices such as mobile phones and notebook computers due to their outstanding advantages such as high working specific energy, large capacity, high voltage, small self-discharge, good cycle performance, light weight, small size, and long service life. . At the same time, countries around the world are racing to develop electric and hybrid electric vehicles to ease environmental pressures. The core technology is the high-performance secondary battery. In order to meet the requirements of use, high-capacity and long-life lithium-ion batteries have become an important research direction for the development of lithium-ion batteries. The existing commercially used anode material is carbon material, and its theoretical specific capacity is only...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/62H01M4/38H01M4/134H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 郭玉国周小四殷雅侠
Owner INST OF CHEM CHINESE ACAD OF SCI
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com