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A kind of oxide pillar supported mxene composite material and its application

A technology of composite materials and oxides, which is applied in the direction of electrochemical generators, structural parts, electrical components, etc., can solve the problems of low application capacity and limit the application prospects of MXene, and achieve the effect of high capacity, stable cycle performance and increased capacity

Active Publication Date: 2019-01-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although MXene materials have excellent electrical conductivity, low lithium-ion diffusion energy barrier, and excellent chemical stability, their application capacity in lithium-ion batteries is low (50-200mAh g -1 ), significantly lower than the capacity of commercial graphite materials (372mAh g -1 )
This largely limits the application prospects of MXenes in Li-ion batteries

Method used

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  • A kind of oxide pillar supported mxene composite material and its application
  • A kind of oxide pillar supported mxene composite material and its application
  • A kind of oxide pillar supported mxene composite material and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 2g Ti 3 AlC 2 Put the powder (MAX) into a beaker, add 80ml of 10% HF acid solution, stir, and etch at room temperature for 15h. Then the etched Ti 3 C 2 The MXene powder was centrifuged, washed with deionization to PH = 6-7, and baked in a blast oven at 80°C for 12 hours. 0.1g dried Ti 3 C 2 MXene powder was stirred in 40 mL of a solution containing 0.005 mol / L cetyltrimethylammonium bromide (CTAB) at 30 °C for 5 h, centrifuged, washed with deionization, and dried. Then 0.1g CTAB pre-pillared Ti 3 C 2 MXene powder was stirred in 40 mL aqueous solution containing 0.3 mol / L nickel nitrate at 40 °C for 6 h, washed with deionized water, and dried. Afterwards, in a nitrogen atmosphere, the NiO pillared Ti 3 C 2 MXene material.

[0024] Using the NiO pillars made in Example 1 to support Ti 3 C 2 MXene material powders were prepared into electrodes as follows.

[0025] Weigh NiO pillared Ti with a mass ratio of 80:10:10 3 C 2 MXene material: super-P: PVDF,...

Embodiment 2

[0027] Take 1.5g Ti 2 Put AlC powder into a beaker, add 40ml of HF solution with a mass fraction of 50%, stir, and etch at room temperature for 6h. Then the etching powder is centrifuged out of Ti 2 C MXene powder, washed with deionization to PH = 6-7, baked in a blast oven at 80°C for 18h. Dry 1g of Ti 2 C MXene powder was stirred in 60 mL of a solution containing 0.03 mol / L dodecyltrimethylammonium bromide (DTAB) at 50 °C for 3 h, centrifuged, washed with deionization, and dried. 1 g DTAB pre-pillared Ti 2 C MXene powder was stirred in 60 mL ethanol solution containing 0.06 mol / L ethyl orthosilicate at 25 °C for 12 h, washed with deionized water, and dried. Afterwards, in an argon atmosphere at a heating rate of 5°C / min at 500°C for 2h to obtain SiO 2 Pillar Ti 2 C MXene materials. With the prepared SiO 2 Pillar Ti 2 The C MXene material is made into an electrode according to the method of Example 1, and assembled into a molded lithium ion battery. The discharge cap...

Embodiment 3

[0029] Take 2.5g Nb 2 Put AlC powder into a beaker, add 10ml of HF solution with a mass fraction of 25%, stir, and etch at room temperature for 8h. Then the etch powder is centrifuged out of Nb 2 C MXene powder, washed with deionization to PH = 6-7, baked in a blast oven at 80°C for 6h. 1.5g of dried Nb 2 C MXene powder was stirred in 50 mL of a solution containing 0.05 mol / L octadecyltrimethylammonium bromide (STAB) at 60 °C for 10 h, centrifuged, washed with deionization, and dried. Then 1.5g STAB pre-pillared Nb 2 The CMXene powder was stirred in 50 mL methanol solution containing 0.06 mol / L tetrabutyl titanate at 45 °C for 15 h, washed with deionized water, and dried. Afterwards, in an argon atmosphere at a heating rate of 3 °C / min at 600 °C for 3 h to obtain TiO 2 Pillar Nb 2 C MXene materials. With the prepared TiO 2 Pillar Nb 2 The C MXene material is made into an electrode according to the method of Example 1, and assembled into a molded lithium ion battery. T...

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Abstract

The invention provides an oxide-pillared MXene composite material and an application thereof. The composite material comprises a two-dimensional layered MXene carrier and an oxide loaded between MXene layers. The preparation method comprises the following steps of (1) processing a taken MAX material with an HF acid solution to obtain an MXene material; (2) soaking the MXene material obtained in the step (1) into a solution containing a cationic surfactant, and then carrying out centrifuging, washing and drying to obtain a pre-pillared MXene material; and (3) adding the pre-pillared MXene material to an oxide precursor solution, carrying out centrifuging, washing and drying and carrying out calcination treatment under a protective atmosphere to obtain the oxide-pillared MXene material. The invention provides an application of the oxide-pillared MXene composite material as a negative electrode material of a lithium-ion battery; the capacity of the negative electrode material of the lithium-ion battery can be greatly improved; and the cycle performance is good, so that high capacity and continuous charge-discharge capacity under high current density are met.

Description

(1) Technical field [0001] The invention relates to an oxide pillar-supported MXene composite material and its application as a lithium-ion battery negative electrode material. (2) Background technology [0002] MXene material is a new type of two-dimensional layered transition metal C / N compound invented by Yury Gogotsi of Drexel University in the United States and Michel Barsoum's research group in 2011. The two-dimensional titanium carbide material has the characteristics of excellent electrical conductivity, chemical stability and the like. So far, the preparation of MXene materials is mainly obtained by exfoliating titanium-aluminum-carbon materials with HF acid. For example Two-Dimensional Nanocrystals Producedby ExfoliationofTi reported by Michael Naguib etc. 3 AlC 2 (Adv. Mater. 2011, 23, 4248–4253). [0003] So far, MXene has been applied in many fields, such as lithium-ion batteries, supercapacitors, photocatalysis, hydrogen storage and other fields. Although ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/364H01M10/0525Y02E60/10
Inventor 罗剑敏金成滨陶新永夏阳梁初黄辉张俊甘永平张文魁
Owner ZHEJIANG UNIV OF TECH
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