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Composite material based on self-supporting reduced graphene oxide coil, and preparation method thereof

A technology of graphene rolls and composite materials, applied in the field of nanomaterials, to achieve the effect of improving the mass ratio of active substances, increasing the specific capacity, and avoiding the use of adhesives and metal current collectors

Active Publication Date: 2018-07-27
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the non-conductivity of sulfur and the discharge product lithium sulfide (Li2S), the change of sulfur volume (~75%) during charging and discharging, and the easy dissolution of the intermediate product lithium polysulfide in the electrolyte restrict its commercial application.

Method used

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  • Composite material based on self-supporting reduced graphene oxide coil, and preparation method thereof
  • Composite material based on self-supporting reduced graphene oxide coil, and preparation method thereof
  • Composite material based on self-supporting reduced graphene oxide coil, and preparation method thereof

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preparation example Construction

[0084] Figure 7 is a schematic flow diagram of a composite material based on self-supporting reduced graphene oxide rolls of the present invention. Such as Figure 7 Shown, the present invention also provides a kind of preparation method based on the composite material of self-supporting reduced graphene oxide roll, generally can comprise the following steps:

[0085] S1, configure a uniformly mixed mixed solution of graphene oxide dispersion liquid and additives in a certain mass ratio;

[0086] S2. After the solution is freeze-dried, an unreduced graphene oxide roll network material is obtained;

[0087] S3, placing the unreduced graphene oxide roll network material in a protective gas atmosphere for a predetermined time at a predetermined temperature to obtain a partially reduced or completely reduced graphene oxide roll network material;

[0088] S4. Configure a mixed solution of water and an organic solvent, and perform a freeze-drying treatment after repeated cleanin...

specific Embodiment 1

[0117] Fabrication of self-supporting unreduced graphene oxide rolls with additives using glucose and graphene oxide:

[0118] 1) Take a certain amount of concentrated H 2 SO 4 , graphite powder, NaNO 3 Stir in ice-water bath; then add KMnO 4 and deionized water continued to stir in an ice-water bath, and finally added H 2 o 2 Afterwards, several times of centrifugation and cleaning were performed to obtain a graphene oxide dispersion.

[0119] 2) Dissolve a certain mass of graphene oxide dispersion and glucose in deionized water for ultrasonication, wherein the concentrations of graphene oxide and glucose are also 0.5 mg / mL.

[0120] 3) Inject the above solution into a polytetrafluoroethylene mold, and then immerse the bottom part of the mold in liquid nitrogen to form a temperature gradient difference. The material is prepared using ice crystal template technology. After the solution is completely solidified, put it into a freeze dryer After drying for 36 hours, take i...

specific Embodiment 2

[0123] The difference between this embodiment and the specific embodiment example 1 is that fructose is used as an additive, and its concentration is 0.25mg / mL. Finally, a self-supporting graphene oxide roll containing fructose is produced, and the diameter of the graphene roll is about 300nm. Others are the same as the specific embodiment example 1.

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Abstract

The invention provides a composite material based on a self-supporting reduced graphene oxide coil, and a preparation method thereof, and belongs to the field of researches on nanometer materials. Thepreparation method comprises: preparing a mixed solution from an additive and graphene oxide, freezing the mixed solution by using liquid nitrogen, further drying in a freeze drying device, treatingat a different temperatures to obtain a partially or completely reduced self-supporting graphene oxide coil network structure material, and combining with a predetermined material to produce the composite material. According to the present invention, the stacking of graphene can be avoided through the structure of the composite material; the large specific surface area of graphene is used, the connection between the coils is good, and a certain flexibility is achieved; and when the composite material is sulfur and is used as the lithium-sulfur battery positive electrode, the use of the bindercan be avoided by using the self-supporting structure of the partially or completely reduced graphene oxide coil network structure material, the specific capacity of the electrode can be increased, and the Coulomb efficiency and the cycle stability of the battery can be easily improved through the extremely large specific surface area of the graphene coil and the oxygen-containing functional groupon the surface.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a composite material based on a self-supporting reduced graphene oxide roll and a preparation method thereof. Background technique [0002] Graphene rolls are one-dimensional structures similar to radially unenclosed carbon nanotubes formed by coils of graphene. This material between graphene and carbon nanotubes not only has high electron mobility and high mechanical strength, but also has unique and excellent electrical and mechanical properties different from the two. This structure not only avoids the problem of easy stacking and agglomeration of graphene sheets, but also maintains its large specific surface area, and compared with carbon nanotubes with a closed structure, the coiled structure of graphene sheets makes it easier to fill and recombine Other materials have a wide range of application values ​​in supercapacitors, lithium batteries and other energy so...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052H01M10/0525H01G11/24H01G11/34H01G11/36
CPCC01P2004/03C01P2004/30C01P2004/62H01G11/24H01G11/34H01G11/36H01M4/362H01M4/38H01M4/386H01M4/625H01M4/628H01M10/052H01M10/0525Y02E60/10
Inventor 陈辉亮肖卓建周维亚王艳春解思深
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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