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One-dimensional high-entropy oxide nano material as well as preparation method and application thereof

A nanomaterial and oxide technology, applied in chemical instruments and methods, nickel compounds, nanotechnology, etc., can solve the problems of reducing the energy storage capacity and working life of high-entropy oxide anode materials, poor structural stability, and small specific surface area. , to achieve the effects of excellent structural stability, high electrical conductivity and high specific surface area

Pending Publication Date: 2022-08-02
HEFEI JINGCHUANG CERAMIC EQUIP TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Studies have proved that high-entropy oxides exhibit high ion mobility and conductivity in the field of energy storage, and have excellent structural stability. It has been confirmed that high-entropy oxides have high theoretical specific capacities in lithium-ion batteries. However, Most of the methods of high-entropy oxides reported at present are solid-phase method, coating or liquid-phase method, and their morphology is mostly block, film and nanoparticle. Such materials have small specific surface area, easy agglomeration, and poor structural stability. Reduced energy storage capacity and working life of high-entropy oxide anode materials

Method used

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  • One-dimensional high-entropy oxide nano material as well as preparation method and application thereof
  • One-dimensional high-entropy oxide nano material as well as preparation method and application thereof
  • One-dimensional high-entropy oxide nano material as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0035] The preparation method of one-dimensional rock-salt type high-entropy oxide (CuCoNiMgZn)O nanomaterial comprises the following steps:

[0036] (1), get 2g of polyvinylpyrrolidone (Shanghai McLean Biochemical Technology Co., Ltd., molecular weight: 1,300,000) and pour it into 10 mL of N,N dimethylformamide solvent, and continue stirring for 12h to fully dissolve it to form a transparent solution;

[0037] (2), add 2mmol copper acetate, 2mmol cobalt acetate, 2mmol nickel acetate, 2mmol magnesium acetate and 2mmol zinc acetate successively in the solution prepared in step (1), continue to stir to dissolve completely, obtain dark blue slurry with this, The slurry is a metal precursor solution;

[0038] (3), suck the metal precursor solution prepared in step (2) through a syringe with a specification of 10mL, the syringe is equipped with a 19G stainless steel needle, and the syringe is fixed on the syringe pump, and the aluminum foil receiving plate is placed vertically 15c...

Embodiment 2

[0048] One-dimensional spinel-type high-entropy oxide (FeCoNiCrMn) 3 O 4 The preparation of nanomaterials includes the following steps:

[0049] (1) Pour 2g of polyvinylpyrrolidone (Shanghai McLean Biochemical Technology Co., Ltd., molecular weight: 1,300,000) into 10mL of N,N dimethylformamide solvent, and continue stirring for 12h to fully dissolve to form a transparent solution.

[0050] (2), add 1mmol ferric chloride, 1mmol cobalt chloride, 1mmol nickel chloride, 1mmol chromium chloride and 1mmol manganese chloride to the solution prepared in step (1) successively, continue stirring until the formation of uniform electrospinning silk pulp;

[0051] (3), transfer the electrospinning slurry prepared in step (2) into a 10mL syringe equipped with a 21G stainless steel needle, fix the syringe on the syringe pump, and receive the aluminum foil The plate was placed 15cm in front of the stainless steel needle, and the negative clip was connected, and the front end of the needle...

Embodiment 3

[0061] An application of a one-dimensional high-entropy oxide nanomaterial as a negative electrode material for a lithium ion battery, specifically a preparation method for a negative electrode material for a lithium ion battery, comprising the following steps:

[0062] 1. Take 40 mg of the (CuCoNiMgZn)O powder obtained in step (4) of Example 1, mix it with 5 mg of acetylene black and 5 mg of PVDF powder, and grind it into a uniform powder, add dropwise an appropriate amount of N-methylpyrrolidone ( NMP) continue to grind until a uniform slurry is formed for later use, take a piece of 20cm×20cm copper foil, fix it in a glass plate, clean and wipe with ethanol to remove surface contaminants;

[0063] 2. Pour the slurry prepared in step 1 on the copper foil, apply it with a 100μm scraper, so that the slurry is evenly spread on the surface of the copper foil, and then put the copper foil into a vacuum oven, vacuum at a temperature of 80 ℃ Dry for 12h;

[0064] 3. Take out the dr...

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Abstract

The invention relates to a one-dimensional high-entropy oxide nano-material and a preparation method and application thereof.The preparation method comprises the steps that an electrostatic spinning solution is prepared with at least five metal salts and a conductive polymer material as precursors, and the one-dimensional high-entropy oxide nano-material is obtained through electrostatic spinning and high-temperature annealing; the obtained one-dimensional high-entropy oxide nano material at least comprises five transition metals, is of a staggered one-dimensional structure and is uniform in diameter, and the diameter ranges from 300 nm to 700 nm. The obtained one-dimensional high-entropy oxide nano material has the advantages that the length-diameter ratio is high, and the specific surface area is large. The material has the advantages of simple preparation process, short diffusion path, sufficient ion diffusion channels, high specific capacity, high specific surface area, high conductivity, excellent structural stability and the like, and shows a great application prospect as a lithium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-entropy oxide nanomaterials, and in particular relates to a one-dimensional high-entropy oxide nanomaterial and a preparation method and application thereof. Background technique [0002] Since high-entropy oxides were first reported in 2015, they have become one of the most concerned new materials because of their unique physical and chemical properties. High-entropy oxides are usually composed of five or more metal oxides in equimolar quantities. The single-phase solid solution formed by the solid solution of each other in a ratio of or near an equimolar ratio is characterized by the existence of a large configuration entropy, so high-entropy oxides exhibit four unique core effects: high-entropy effect, lattice distortion. effect, delayed diffusion effect, and the "cocktail effect". [0003] Studies have shown that high-entropy oxides exhibit high ionic mobility and electrical condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48C01G53/00B82Y40/00
CPCH01M4/48C01G53/006B82Y40/00C01P2004/10C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 李静魏徽徐艳章旭许小兵徐小勇张扬
Owner HEFEI JINGCHUANG CERAMIC EQUIP TECH
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