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Two-dimensional transition metal carbide/titanium dioxide/graphene composite material, preparation and application thereof

A technology of titanium dioxide and composite materials, used in the manufacture of hybrid/electric double-layer capacitors, electrodes of hybrid capacitors, etc., can solve the problems of poor cycle stability and low energy density of lithium-ion capacitors, and achieve high power density, enhanced conductivity, high The effect of volumetric capacitance

Inactive Publication Date: 2019-09-27
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the characteristics of high bulk density and simple process, and can effectively solve the problems of low energy density and poor cycle stability of lithium-ion capacitors.

Method used

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  • Two-dimensional transition metal carbide/titanium dioxide/graphene composite material, preparation and application thereof
  • Two-dimensional transition metal carbide/titanium dioxide/graphene composite material, preparation and application thereof
  • Two-dimensional transition metal carbide/titanium dioxide/graphene composite material, preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: Weigh 1g LiF and put it in a 100mL hydrothermal reaction kettle, add 20 mL 9M HCl solution, stir at 550rpm for 10min; then, slowly add 1g Ti in an ice bath 3 AlC 2 , Subsequently, the reactor was transferred to a 35°C water bath, and stirred at a constant temperature for 48h. Centrifugal washing with deionized water to pH greater than 5, freeze-drying for 24 hours to obtain multilayered Ti 3 C 2 . The above multilayer Ti 3 C 2 Add 200mL deionized water, sonicate for 2h, and centrifuge at 3500rpm for 40min. The obtained supernatant was transferred to a bottle and ventilated with Ar gas for 10 min, then wrapped in aluminum foil to avoid light, and stored in refrigerator. The graphite oxide is ultrasonically dispersed in water to obtain a graphene oxide dispersion. Take the Ti obtained above 3 C 2 T x The dispersion liquid and the GO dispersion liquid are mixed according to the mass ratio of 95:5, ultrasonically mixed, and 5% GO / Ti is obtained by sucti...

Embodiment 2

[0031] Example 2: Weigh 1g LiF and place it in a 100mL hydrothermal reaction kettle, add 20 mL 9M HCl solution, stir at 550rpm for 10min; then, slowly add 1g Ti in an ice bath 3 AlC 2 , Subsequently, the reactor was transferred to a 35°C water bath, and stirred at a constant temperature for 48h. Centrifugal washing with deionized water to pH greater than 5, freeze-drying for 24 hours to obtain multilayered Ti 3 C 2 . The above multi-layer multi-layer Ti 3 C 2 (Ml-TC) was added with 200 mL deionized water, ultrasonicated for 2 h, and centrifuged at 3500 rpm for 40 min. The obtained supernatant was transferred to a bottle and ventilated with Ar gas for 10 min, then wrapped in aluminum foil to avoid light, and stored in refrigerator. The graphite oxide is ultrasonically dispersed in water to obtain a graphene oxide dispersion. Take the Ti obtained above 3 C 2 T x The dispersion liquid and the graphene oxide dispersion liquid (GO) were mixed ultrasonically according to t...

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Abstract

The invention relates to a two-dimensional transition metal carbide / titanium dioxide / graphene composite material, preparation and application thereof. The prepared composite material is composed of graphene, oxide, and two-dimensional transition metal carbide. According to the two-dimensional transition metal carbide / titanium dioxide / graphene composite material of the sandwich structure constructed by the invention, due to the intercalated structure, self-stacking of sheets of graphene and two-dimensional transition metal carbide can be prevented, and capacitive active positions are increased. The small amount of oxide titanium dioxide produced by a thermal reduction process can provide the embedded pseudocapacitance activity, and the large-sized graphene sheet layer can also enhance the electrical conductivity between the two-dimensional transition metal carbide sheets, further improving the electrochemical performance of the composite material and the performance of a lithium ion capacitor.

Description

technical field [0001] The invention relates to the preparation of a two-dimensional transition metal titanium compound, a two-dimensional transition metal carbide / titanium dioxide / graphene composite material with a sandwich structure, its preparation and application, and belongs to the technical field of nanometer electrochemical active materials and energy storage. Background technique [0002] With the popularization of portable electronic products, electrified transportation and smart grid, it is of great significance to develop energy storage devices with high power and high energy density. Supercapacitors, which store energy through surface electrostatic adsorption or reversible redox reactions near the surface, have high power densities. However, the energy density of supercapacitors is limited by the limited electron storage capacity of active materials. Lithium-ion capacitors are hybrid energy storage devices with high power and high energy density. Lithium-ion ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/50H01G11/26H01G11/32H01G11/46H01G11/86
CPCH01G11/26H01G11/32H01G11/46H01G11/50H01G11/86Y02E60/13
Inventor 施利毅李贞英张登松陈国荣颜婷婷邓江刘洪江张剑平
Owner SHANGHAI UNIV
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