TiO2/graphene multi-element modified Mxene composite material and preparation method thereof

A technology of titanium dioxide and composite materials, applied in the field of composite materials and their preparation, can solve the problems of the longitudinal conductivity of Mxene materials embedded in other materials, the small interlayer spacing of Mxene materials, and the lack of modification and improvement of the longitudinal conductivity of Mxene materials, and achieve excellent performance. Cycling performance and capacity reversibility, effects of improving longitudinal and surface conductivity, and improving electrochemical performance

Active Publication Date: 2019-01-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor surface and longitudinal conductivity of intrinsic Mxene materials, its application in the field of energy storage is limited to some extent.
[0005] CN107633954A discloses a kind of Graphene/Mxene composite electrode material and application thereof, although gained Graphene/Mxene composite material has effectively improved Mxene material electrical conductivity, gained Graphene/Mxene composite material does not improve Mxene material longitudinal conductivity sexual enhancement
[0006] CN1071

Method used

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  • TiO2/graphene multi-element modified Mxene composite material and preparation method thereof
  • TiO2/graphene multi-element modified Mxene composite material and preparation method thereof
  • TiO2/graphene multi-element modified Mxene composite material and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0035] Example 1

[0036] (1) Add 30 g of HF acid (40% by mass) into a polytetrafluoroethylene tank, add 1.0 g of Mxene precursor to it, and stir for 6 h at 400 revolutions / min at a constant temperature of 90°C. Etching

[0037] (2) Add the Mxene obtained in step (1) to water, centrifuge at 10,000 rpm, and wash the precipitate 10 times with deionized water and absolute ethanol, respectively, and ultrasonically treat it at 400 W for 1 h at 80°C After drying for 10 hours, Mxene material was obtained;

[0038] (3) Add 0.1 g of the Mxene material obtained in step (2) to 60 mL of deionized water, perform ultrasonic dispersion at 400 W for 1 h, add 0.8 g of ammonium bicarbonate, and stir at 400 revolutions / min for 2 h to obtain the surface Charge modified Mxene material dispersion;

[0039] (4) Add 0.005 g of nano-sized titanium dioxide and graphene oxide to 5 mL of deionized water, and ultrasonically disperse for 2 h at 400 W to obtain titanium dioxide dispersion and graphene oxide dispe...

Example Embodiment

[0049] Example 2

[0050] (1) Add 30 g of HF acid (25% by mass) into a polytetrafluoroethylene tank, add 1.0 g of Mxene precursor to it, and stir for 10 h at 300 rpm and a constant temperature of 85°C. Etching

[0051] (2) Add the Mxene obtained in step (1) to water, centrifuge at 5000 rpm, and wash the precipitate 10 times with deionized water and absolute ethanol respectively, and ultrasonically treat it at 400 W for 1 h at 80°C. After drying for 10 hours, Mxene material was obtained;

[0052] (3) Add 0.1 g of the Mxene material obtained in step (2) to 60 mL of deionized water, perform ultrasonic dispersion at 400 W for 1 hour, add 1.5 g of ammonia, and stir at 400 revolutions / min for 1 hour to obtain a surface charge change. Mxene material dispersion liquid;

[0053] (4) Add 0.01 g of nano-sized titanium dioxide and graphene oxide to 5 mL of deionized water, and ultrasonically disperse for 2 h at 400 W to obtain titanium dioxide dispersion and graphene oxide dispersion;

[0054] (...

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Abstract

A titanium dioxide/graphene multicomponent modified Mxene composite material is prepared by the following methods: (1) adding Mxene precursor into HF acid solution, heating, stirring and etching; (2)centrifuging, washing, ultrasonic and drying the etched material to obtain Mxene material; 3) adde Mxene material into water, ultrasonic disper, adding surface charge modifier and stirring; 4) adde nanometer titanium dioxide and graphene oxide into water respectively, ultrasonic disper to obtain titanium dioxide and graphene oxide dispersions respectively; 5) adde that dispersion of titanium dioxide and graphene oxide into the Mxene dispersion in turn, stirring, filter and drying; (6) heat treatment in an inert atmosphere. Nanometer titanium dioxide partially intercalates between Mxene layersto improve the longitudinal conductivity of Mxene, and partially adsorbs on the surface of Mxene material to improve its surface conductivity. Graphene Coating on Mxene Surface to Improve Conductivityof Mxene Surface. The assembled lithium ion battery has high specific capacity, high rate performance and good cycle stability.

Description

technical field [0001] The invention relates to a composite material and a preparation method thereof, in particular to a titanium dioxide / graphene multi-component modified Mxene composite material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become ideal energy storage devices due to their high energy density, high power density, environmental friendliness, long service life, and superior safety performance. [0003] Since the advent of graphene two-dimensional materials, two-dimensional materials have become a hot topic in scientific research. Two-dimensional materials have a special layered structure, which is useful in mechanics, optics, electrochemistry, and so on. Informatics shows excellent performance. At present, two-dimensional materials have been deeply studied in the fields of catalysts, energy storage devices, sensors and biomaterials. [0004] Graphene is a typical representative of two-dimensional materials. In...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525
CPCH01M4/366H01M4/48H01M4/583H01M10/0525Y02E60/10
Inventor 郑俊超安长胜左定川宋生超杨书棋肖彬汤林波贺振江
Owner CENT SOUTH UNIV
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