Preparation method of three-dimensional TiO2 nanowire/MXene composite material

A composite material and nanowire technology, which is applied in the field of preparation of three-dimensional TiO2 nanowire/MXene composite materials, can solve the problems of easy oxidation of nanosheets, increased requirements for storage devices, and increased production costs, and achieves a high density that is conducive to tight penetration and ionization. The effect of fast transmission, good development and application prospects, and improved security

Pending Publication Date: 2022-02-08
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent obtained CTAB intercalation Ti 3 C 2 Nanosheets are easy to oxidize, which increases the requirements for storage devices and increases production costs

Method used

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  • Preparation method of three-dimensional TiO2 nanowire/MXene composite material
  • Preparation method of three-dimensional TiO2 nanowire/MXene composite material
  • Preparation method of three-dimensional TiO2 nanowire/MXene composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The 60 ml concentration of 5.49 mg / ml hydrochloric acid solution was taken with 3 g of fluorinated lithium fluoride in a plastic container for 15 min to dissolve hydrofluoric acid; 3 g of titanium aluminum aluminum aluminum 3 ALC 2 In the same temperature, it was slowly added to the above solution, etching 48h peeling the aluminum layer; the reaction solution was centrifuged 6 times, the top 5 centrifugal revolutions were 3500 rpm, the time was 5 min, and the last centrifugal revolution was 5000 rpm, and the time was 30 min. The freeze-dried temperature is provided below -5 ° C, the time is 60 h, the vacuum is 1 Pa, and the freeze drying is carried out in a freeze dryer. The cold trap temperature is set to -63 ° C to eliminate water vapor, and the freeze-drying is completed. Ti 3 C 2 Mxne; 50mg Ti 3 C 2 MXENE was dispersed at 15 ml of concentration of 40 g / L sodium hydroxide solution, then the magnetic force was stirred at 600 rpm of rotational speed for 120 h, and the ...

Embodiment 2

[0048] The 60 ml concentration of 5.49 mg / ml hydrochloric acid solution was taken with 3 g of fluorinated lithium fluoride in a plastic container for 15 min to dissolve hydrofluoric acid; 3 g of titanium aluminum aluminum aluminum 3 ALC 2 In the same temperature, it was slowly added to the above solution, etching 48h peeling the aluminum layer; the reaction solution was centrifuged 6 times, the top 5 centrifugal revolutions were 3500 rpm, the time was 5 min, and the last centrifugal revolution was 5000 rpm, and the time was 30 min. The freeze-dried temperature is set below -5 ° C, the time is 60 h, the vacuum is 1 Pa, and the freeze-drying is carried out in a freeze dryer. Ti 3 C 2 Mxne; 50mg Ti 3 C 2 MXENE was dispersed in a 15 ml concentration of 20 g / L in sodium hydroxide solution, then the magnetic force was stirred at 600 rpm to stir for 120 h, and the composite material was centrifuged at 8000 rpm for 8 min, 55 ° C, dried overnight, i.e., the product product was obtained...

Embodiment 3

[0052] The 60 ml concentration of 5.49 mg / ml hydrochloric acid solution was taken with 3 g of fluorinated lithium fluoride in a plastic container for 15 min to dissolve hydrofluoric acid; 3 g of titanium aluminum aluminum aluminum 3 ALC 2 In the same temperature, it was slowly added to the above solution, etching 48h peeling the aluminum layer; the reaction solution was centrifuged 6 times, the top 5 centrifugal revolutions were 3500 rpm, the time was 5 min, and the last centrifugal revolution was 5000 rpm, and the time was 30 min. The freeze-dried temperature is below -5 ° C, the time is 60 h, the vacuum is 1 Pa, and the freeze drying is carried out in a freeze dryer. The cold trap temperature is set to -63 ° C to eliminate water vapor, and the freeze-drying is completed. Ti 3 C 2 Mxne; 50mg Ti 3 C 2 MXENE was dispersed at 15 ml of concentration of 40 g / L sodium hydroxide solution, then the magnetic force was stirred at 600 rpm of rotational speed for 120 h, and the composite...

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Abstract

The invention relates to a lithium battery negative electrode material, in particular to a preparation method of a three-dimensional TiO2 nanowire / MXene composite material. The method comprises the following steps: S1, adding Ti3AlC2 into hydrofluoric acid, and etching and stripping an aluminum layer; S2, carrying out the centrifugal drying on the reaction liquid obtained in the step S1 to obtain Ti3C2MXene; S3, ultrasonically dispersing the Ti3C2MXene obtained in the step S2 into a sodium hydroxide solution, and performing magnetic stirring to obtain a composite material precursor; S4, centrifuging and drying the composite material precursor obtained in the step S3 to obtain the composite material. Compared with the prior art, the preparation method has the advantages that MXene is alkalized through the sodium hydroxide solution, so that the interlayer spacing of MXene can be enlarged, the storage and transportation of lithium ions are facilitated, and the composite material has higher reversible capacity, better rate capability and good cycling stability and conductivity and is suitable for being applied to lithium ion batteries.

Description

Technical field [0001] The present invention relates to a lithium negative electrode material, particularly relates to a three-dimensional TiO 2 Nanowires / MXene preparing composite material. Background technique [0002] In recent years, environmental pollution and the depletion of fossil fuel resources become more severe, the development of advanced renewable energy technologies become a global priority. Lithium-ion battery with its high capacity and cycling stability is considered to be the most promising area of ​​future energy storage product candidate, which has been dominant in the portable electronics market. [0003] Although the lithium ion battery has been widely used as power sources has a variety of applications from portable electronic devices, electric vehicles, energy storage to the grid, but the energy density is still not satisfactory. To increase its energy storage capability, without damage to the lithium ion battery power density and cycle stability, investi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62
CPCH01M4/362H01M4/48H01M4/624Y02E60/10
Inventor 蔺华林罗宇张文轩谭陈杰孔玥薛原黄燕山
Owner SHANGHAI INST OF TECH
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