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Nitrogen-containing high-entropy MXene with sulfur catalysis function, diaphragm composite material and battery

A composite material and lithium-sulfur battery technology, applied in the field of new materials, can solve problems such as the reduction of mixing entropy and the difficulty of atomic layer peeling, and achieve the effects of avoiding the loss of active materials, avoiding the generation of the shuttle effect, and reducing the dissolution.

Active Publication Date: 2022-01-25
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All HEMs reported so far are 3D bulk with strong chemical bonds inside, which makes atomic layer exfoliation difficult.
In addition, in traditional synthetic processes such as pyrometallurgy, phases in high-entropy atomic layers are easily separated due to the reduction of mixing entropy.

Method used

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  • Nitrogen-containing high-entropy MXene with sulfur catalysis function, diaphragm composite material and battery
  • Nitrogen-containing high-entropy MXene with sulfur catalysis function, diaphragm composite material and battery
  • Nitrogen-containing high-entropy MXene with sulfur catalysis function, diaphragm composite material and battery

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Experimental program
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Effect test

Embodiment 1

[0045] This embodiment provides a nitrogen-containing high-entropy MXene two-dimensional material (Ti 1 / 3 Nb 1 / 6 Ta 1 / 6 Zr 1 / 6 V 1 / 6 ) 2 C 0.5 N 0.5 method of preparation, such as figure 1 As shown, by etching nitrogen-containing high-entropy MAX phase material (Ti 1 / 3 Nb 1 / 6 Ta 1 / 6 Zr 1 / 6 V 1 / 6 ) 2 AlC 0.5 N 0.5 The Al element in it is obtained.

[0046] Nitrogen-containing high-entropy MAX phase materials (Ti 1 / 3 Nb 1 / 6 Ta 1 / 6 Zr 1 / 6 V 1 / 6 ) 2 AlC 0.5 N 0.5 preparation, including:

[0047] Ingredients step: according to the chemical formula of high entropy MAX phase (Ti 1 / 3 Nb 1 / 6 Ta 1 / 6 Zr 1 / 6 V 1 / 6 ) 2 AlC 0.5 N 0.5 The medium stoichiometric ratio (molar ratio) is Ti 4 AlN 3 , V 2 AlC and (Nb 1 / 3 Ta 1 / 3 Zr 1 / 3 ) 2 AlC is used as the raw material precursor, and its molar ratio is Ti 4 AlN 3 :V 2 AlC:(Nb 1 / 3 Ta 1 / 3 Zr 1 / 3 ) 2 AlC=1:1:3, accurately weigh each raw material precursor according to the corresponding molar ratio;

[00...

Embodiment 2

[0057] This embodiment provides a nitrogen-containing high-entropy MXene two-dimensional material (Ti 1 / 3 Nb 1 / 6 Ta 1 / 6 Zr 1 / 6 V 1 / 6 ) 2 C 0.5 N 0.5 The preparation method, by etching nitrogen-containing high-entropy MAX phase material (Ti 1 / 3 Nb 1 / 6 Ta 1 / 6 Zr 1 / 6 V 1 / 6 ) 2 AlC 0.5 N 0.5 The Al element in it is obtained.

[0058] Nitrogen-containing high-entropy MAX phase materials (Ti 1 / 3 Nb 1 / 6 Ta 1 / 6 Zr 1 / 6 V 1 / 6 ) 2 AlC 0.5 N 0.5 preparation, including:

[0059] Ingredients step: according to the chemical formula of the nitrogen-containing high-entropy MAX phase (Ti 1 / 3 Nb 1 / 6 Ta 1 / 6 Zr 1 / 6 V 1 / 6 ) 2 AlC 0.5 N 0.5 The stoichiometric ratio (molar ratio) of Ti 4 AlN 3 , Nb 2 AlC and (V 1 / 3 Ta 1 / 3 Zr1 / 3 ) 2 AlC is used as the raw material precursor, and its molar ratio is Ti 4 AlN 3 :Nb 2 AlC:(V 1 / 3 Ta 1 / 3 Zr 1 / 3 ) 2 AlC=1:1:3, accurately weigh each raw material precursor according to the corresponding molar ratio;

[0060] Grinding...

Embodiment 3

[0065] This embodiment present invention provides another kind of preparation nitrogen-containing high entropy MAX phase (Ti 1 / 3 Nb 1 / 6 Ta 1 / 6 Zr 1 / 6 V 1 / 6 ) 2 C 0.5 N 0.5 T x The preparation method is similar to Example 1, and the difference is that: in the batching step, (Zr 1 / 3 Nb 1 / 3 Ta 1 / 3 ) 2 AlC, Ti 2 AlN and V 2 AlC is used as the raw material to prepare according to the molar ratio of 3:1:1.

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Abstract

The invention discloses a nitrogen-containing high-entropy MXene used for a battery and having a sulfur catalysis function. The battery is a lithium-sulfur battery. The chemical formula of the nitrogen-containing high-entropy MXene is shown as M'X, wherein M' is selected from at least five metal elements in IIIB, IVB, VB, VIB, VIIB, VIII, IB and IIB groups, and X is C and N elements. The nitrogen-containing high-entropy MXene shows good adsorption and catalysis capability on LiPSs under the action of mechanical strain and five or more metal-N bonds, shows high Li2S deposition capacity, is applied to a lithium-sulfur battery, and realizes high rate performance and relatively long cycle life in the Li-S battery.

Description

[0001] This application requires the application number 202110560272.7 submitted to the Chinese Patent Office on May 21, 2021, the title of the invention is "Nitrogen-containing medium-entropy or high-entropy MAX phase material and its preparation method and application" and the application number is 202110560245.X, the invention Partial priority of the Chinese patent application titled "Nitrogen-Containing Novel MAX Phase Material and Preparation Method and Use of Two-Dimensional Materials", part of the content of these two applications is incorporated in the present invention by reference. technical field [0002] The invention relates to the field of new materials, in particular to the application of a high-entropy MXene in a battery, and more specifically to a nitrogen-containing high-entropy MXene with sulfur catalytic function, a diaphragm composite material and a battery. Background technique [0003] High-entropy materials (HEMs) hold great potential in the field of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
CPCC04B35/58007C04B35/622C04B2235/3865C04B2235/3817C04B2235/6562C04B2235/6567H01M50/403H01M50/449H01M50/446H01M10/052H01M4/136H01M4/62H01M4/667H01M4/661H01M2004/028Y02E60/10
Inventor 杨树斌杜志国
Owner BEIHANG UNIV
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