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Preparation method and application of two-dimensional crystal MXene nanomaterial

A nanomaterial and two-dimensional crystal technology, applied in the field of new energy storage, can solve the problem that the energy storage space between layers is not fully utilized, and achieve the effects of improving the stability of the cycle structure, solving stacking and agglomeration, and simple process methods

Inactive Publication Date: 2019-06-18
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its potential interlayer energy storage space has not been fully utilized. If the interlayer energy storage space of MXene materials is further developed and utilized, its capacity as a lithium battery electrode material is expected to be further improved.

Method used

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  • Preparation method and application of two-dimensional crystal MXene nanomaterial
  • Preparation method and application of two-dimensional crystal MXene nanomaterial

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of a kind of two-dimensional crystal MXene nanometer material that the present invention proposes comprises the following steps: the particle diameter is 500 order 1gTi 3 AlC 2 The powder is submerged in 17mL of a mixed solution composed of ammonium fluoride and hydrochloric acid, wherein the concentration of fluoride ions in the mixed solution is 5.5mol / L, stirred and reacted at 25°C for 24h, then poured into a centrifuge tube and repeated with deionized water. Centrifuge several times until the solution in the centrifuge tube is neutral, suck out the upper layer solution, and put the sample left at the bottom of the centrifuge tube in a vacuum drying oven at 80°C for 12 hours to obtain the two-dimensional crystal compound Ti 3 C 2 .

[0024] The prepared two-dimensional carbide MXene Ti 3 C 2 The composite material is made into electrodes according to the following method: Weigh the nano-carbon two-dimensional carbide MXene Ti with a mass ra...

Embodiment 2

[0027] The preparation method of a kind of two-dimensional crystal MXene nano-material proposed by the present invention comprises the following steps: the particle diameter is 500 mesh 1g Ti 2 Submerge the AlC powder in 20mL of a mixed solution composed of lithium fluoride and hydrochloric acid, in which the concentration of fluoride ions in the mixed solution is 6mol / L, stir and react at 40°C for 48h, and pour it into a centrifuge tube for cleaning after cooling to room temperature Until the solution is neutral, suck out the upper layer solution, put the sample left at the bottom of the centrifuge tube in a vacuum drying oven at 80°C for 12 hours, and obtain the two-dimensional crystal compound Ti 2 C powder.

[0028] Make nanometer MXene (Ti 2 C) The electrode is assembled into a lithium-ion battery, and the discharge capacity after 500 cycles at a current density of 500mA / g is close to 130mAh / g, and the Coulombic efficiency is also stable above 95%.

Embodiment 3

[0030] The preparation method of a kind of two-dimensional crystal MXene nano material that the present invention proposes comprises the following steps: the particle diameter is 500 mesh 1g V 2 The AlC powder is submerged in 23mL of a mixed solution composed of sodium fluoride and hydrochloric acid, wherein the concentration of fluoride ions in the mixed solution is 6.5mol / L, stirred and reacted at 90°C for 72h, cooled to room temperature, poured into a centrifuge tube and centrifuged Wash until the solution is neutral, suck out the upper layer solution, and put the sample left at the bottom of the centrifuge tube in a vacuum drying oven at 80°C for 12 hours to obtain a two-dimensional crystal compound V 2 C powder.

[0031] figure 1 For two-dimensional carbide MXene V 2 The scanning electron microscope picture of C material, it can be clearly seen from the picture that after being etched by the mixed solution of sodium fluoride and hydrochloric acid, the V with lamellar mo...

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Abstract

The invention discloses a preparation method and an application of a two-dimensional crystal MXene nanomaterial, and relates to the technical field of novel energy storage. The preparation method comprises the following steps: crushing and sieving a ternary layered ceramic MAX phase material to obtain an MAX phase ceramic powder; and immersing the MAX phase ceramic powder in a mixed solution composed of a fluorine salt and an inorganic acid, stirring and reacting the obtained solution, and centrifuging, washing and drying the obtained reaction product to obtain the two-dimensional crystal MXene nanomaterial. The method has the advantages of simple process, low cost, no special process device, convenience, high efficiency and good safety, and the MXene nanomaterial can be used as an electrode material of a lithium battery to improve the cyclic structural stability of the material and improve the specific capacity and the cycle life, and is an excellent lithium battery electrode material.

Description

technical field [0001] The invention relates to the technical field of new energy storage, in particular to a preparation method and application of a two-dimensional crystal MXene nanomaterial. Background technique [0002] Lithium-ion batteries (LIBs) are very important clean energy storage containers and, moreover, have been extensively developed in modern electrochemistry. However, it is still a great challenge to satisfy lithium batteries with fast charge-discharge rate, high storage energy and high capacity density. Therefore, the search for new energy materials has never stopped. [0003] MXene is a new type of two-dimensional layered transition metal carbide or carbonitride nanomaterial with a graphene-like structure, which is generally obtained by etching away the A element in the MAX phase of the precursor by a chemical liquid phase method. Due to its variety and excellent physical and chemical properties, it has attracted extensive research in recent years, and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/921C01B32/914H01M4/58H01M10/0525B82Y40/00
CPCY02E60/10
Inventor 张贺
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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