CN-121986069-A - Composite, conductive material, electrode, and secondary battery including same

Abstract

Disclosed is a composite body capable of reducing the resistance of a battery. According to one aspect, there is provided a composite comprising graphene, and carbon nanotubes on the graphene, wherein the ratio (I d /I g ) of D-band intensity (I d ) to G-band intensity (I g ) of the composite, as measured by Raman spectroscopy (RAMAN SPECTRA), is 1.00 or less.

Inventors

• Jin Duxun
• Li Zhouzhe
• Liang Huican
• LI JUNHE
• Jin Chengdu

Assignees

• 株式会社东进世美肯

Dates

Publication Date

20260505

Application Date

20241004

Priority Date

20231013

Claims (15)

1. 1. A composite, comprising: Graphene, and The carbon nanotubes on the graphene, In the raman spectroscopy, the ratio (I d /I g ) of the D band intensity (I d ) to the G band intensity (I g ) of the complex is 1.00 or less.
2. 2. The complex according to claim 1, wherein, According to the X-ray diffraction (XRD) analysis, The graphene has a full width at half maximum (FWHM) on the (002) crystal plane of 6.5 to 20.
3. 3. The complex according to claim 1, wherein, The thickness of the graphene is 1 to 100 nm a.
4. 4. The complex according to claim 1, wherein, The carbon nanotubes include at least one of single-walled carbon nanotubes and multi-walled carbon nanotubes.
5. 5. The complex according to claim 1, wherein, The length of the carbon nanotubes is 10 to 20,000 nm.
6. 6. The complex according to claim 1, wherein, The ratio of the length of the graphene to the length of the carbon nanotubes is 1:2 to 1:50,000.
7. 7. The complex according to claim 1, wherein, The weight ratio of the graphene to the carbon nanotubes is 99:1 to 80:20.
8. 8. The complex according to claim 1, wherein, The graphene and the carbon nanotube are directly connected.
9. 9. The complex according to claim 1, wherein, The bonding angle of the graphene and the carbon nanotube is 1 to 90 degrees.
10. 10. The complex according to claim 1, wherein, The powder density of the composite is below 1.00 g/cm 3.
11. 11. A composite, comprising: Graphene, and The carbon nanotubes on the graphene, Wherein, the powder conductivity of the complex is more than 180S/cm.
12. 12. A composite, comprising: Graphene, and The carbon nanotubes on the graphene, The impurity content of the complex is 1,200 ppm or less.
13. 13. An electrically conductive material comprising the composite of any one of claims 1 to 12.
14. 14. An electrode comprising the conductive material of claim 13.
15. 15. A secondary battery, comprising: a first electrode; a second electrode; a separator interposed between the first electrode and the second electrode, and The electrolyte is used for preparing the electrolyte, Wherein at least one of the first electrode and the second electrode comprises an electrode according to claim 14.

Description

Composite, conductive material, electrode, and secondary battery including same Technical Field The present invention relates to a composite body, and more particularly, to a composite body, a conductive material, an electrode, and a secondary battery including the same. Background The carbon atoms in the graphite are connected in a hexagonal structure, thus forming a two-dimensional layer structure, and the layers are stacked to form a layered structure. In such graphite, single-layer graphene may have a remarkable characteristic in that its tensile strength is about 200 times that of steel, electron mobility is about 1,000 times that of silicon, and thermal conductivity is about 10 times that of copper. Based on these characteristics, many studies are being conducted in the field of nanomaterials, aiming at applying them to a wide range of application fields such as secondary batteries, inks, barrier layers, heat sinks, energy, semiconductors, transparent electrodes, and the like. In addition, carbon nanotubes are used as conductive materials based on their characteristics of large specific surface area, high conductivity, and light weight. These carbon nanotubes constitute a hollow cylindrical structure and can be manufactured by various methods such as an arc discharge method, a laser deposition method, and the like. Disclosure of Invention Technical problem According to one aspect of the present invention, a composite body having improved structural stability, low impurity content and high powder conductivity is provided. According to another aspect of the present invention, there is provided a composite body capable of reducing the internal resistance of a battery while preventing damage to a separator, thereby further improving the stability of the secondary battery. According to another aspect of the present invention, there is provided a method of manufacturing a composite body, which is simple in manufacturing process and reduces manufacturing costs by not using a catalyst and a binder. According to another aspect of the present invention, there is provided a conductive material having excellent electrical properties. According to another aspect of the present invention, there is provided an electrode comprising the conductive material. According to another aspect of the present invention, there is provided a secondary battery capable of preventing damage to a separator and reducing battery resistance. The objects of the present invention are not limited to the above, and other objects and advantages of the present invention, which are not mentioned, will be understood from the following description, and will be more clearly understood through embodiments of the present invention. Furthermore, it is apparent that the objects and advantages of the present invention can be realized by the means described in the specification and combinations thereof. Solution method According to a first aspect of the present invention, there is provided a composite comprising graphene and carbon nanotubes on the graphene, wherein in raman spectroscopy (RAMAN SPECTRA), the ratio (I d/Ig) of D-band intensity (I d) to G-band intensity (I g) of the composite is 1.00 or less. According to a second aspect of the present invention, in the first aspect, the graphene may have a Full width at half maximum (FWHM: full WIDTH AT HALF maximum) on the (002) plane of 6.5 to 20 according to X-ray Diffraction (XRD) analysis. According to a third aspect of the present invention, in the first or second aspect, the thickness of the graphene may be 1 to 100 nm a. According to a fourth aspect of the present invention, in any one of the first to third aspects, the carbon nanotubes may include at least one of single-walled carbon nanotubes and multi-walled carbon nanotubes. According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the carbon nanotubes may have a length of 10 to 20,000 nm. According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a ratio of a length of the graphene to a length of the carbon nanotube may be 1:2 to 1:50,000. According to a seventh aspect of the present invention, in any one of the first to sixth aspects, a weight ratio of the graphene to the carbon nanotubes may be 99:1 to 80:20. According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the graphene and the carbon nanotube may be directly connected. According to a ninth aspect of the present invention, in any one of the first to eighth aspects, a bonding angle of the graphene and the carbon nanotube may be 1 to 90 °. According to a tenth aspect of the present invention, in any one of the first to ninth aspects, the powder density of the composite may be 1.00 g/cm3 or less, 0.95 g/cm3 or less, 0.92 g/cm3 or less, 0.88 g/cm3 or less, 0.75 g/cm3 or less, 0.71 g/cm3 or less, 0.65 g/cm3 or less, 0.63 g/cm3 or less, or 0.59 g/cm3 or less, specifical