Five-element transition metal oxide high-entropy material for lithium-ion battery

A technology of lithium-ion batteries and transition metals, applied in electrical components, battery electrodes, secondary batteries, etc., can solve problems that are difficult to obtain large-scale promotion, achieve uniform chemical composition and microstructure, good rate performance, and large The effect of the first charge ratio capacity

Active Publication Date: 2019-12-20
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still in the basic research stage, and it is difficult to get large-scale promotion in the short term.

Method used

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  • Five-element transition metal oxide high-entropy material for lithium-ion battery
  • Five-element transition metal oxide high-entropy material for lithium-ion battery
  • Five-element transition metal oxide high-entropy material for lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A five-element transition metal oxide high-entropy material for lithium-ion batteries was prepared by a solution combustion method, and the chemical composition of the high-entropy material was (Cr 0.2 Fe 0.2 mn 0.2 Zn 0.2 co 0.2 ) 3 o 4 . Weigh the metal nitrates of equimolar amounts according to the molecular formula, specifically: 4.002g of Cr(NO 3 ) 3 .9H 2 O, 4.040g of Fe(NO 3 ) 3 .9H 2 O, 2.870g of Mn(NO 3 ) 2 .4H 2 O, 2.975g of Zn(NO 3 ) 2 .6H 2 O and 2.910g of Co(NO 3 ) 2 .6H 2 O, dissolved in 10mL distilled water, stirred evenly at room temperature to obtain a mixed solution containing five metal cations; then weighed 3.003g glycine and added to the mixed solution, stirred evenly; then put the above transparent sol in an oven at 80°C After drying in medium temperature and evaporating water, a viscous gel was obtained; finally, the above gel was placed in a gold furnace and kept at 750°C for 30 minutes to obtain a spinel-type crystal structur...

Embodiment 2

[0034] A five-element transition metal oxide high-entropy material for lithium-ion batteries was prepared by a solution combustion method, and the chemical composition of the high-entropy material was (Cr 0.2 Fe 0.2 mn 0.2 Zn 0.2 Ni 0.2 ) 3 o 4 . Weigh the metal nitrates of equimolar amounts according to the molecular formula, specifically: 4.002g of Cr(NO 3 ) 3 .9H 2 O, 4.040g of Fe(NO 3 ) 3 .9H 2 O, 2.870g of Mn(NO 3 ) 2 .4H 2 O, 2.975g of Zn(NO 3 ) 2 .6H 2 O and 2.908g of Ni(NO 3 ) 2 .6H 2 O, dissolved in 2.5mL distilled water, stirred evenly at room temperature to obtain a mixed solution containing five metal cations; then weighed 2.252g glycine and 3.843g ethylenediaminetetraacetic acid and added to the mixed solution, stirred evenly; then The above-mentioned transparent sol was dried in an oven at 150°C, and a viscous gel was obtained after evaporating water; finally, the above-mentioned gel was placed in a muffle furnace and kept at 350°C for 1 hour ...

Embodiment 3

[0037] A five-element transition metal oxide high-entropy material for lithium-ion batteries was prepared by a solution combustion method, and the chemical composition of the high-entropy material was (Cr 0.2 Fe 0.2 mn 0.2 Zn 0.2 Ni 0.2 ) 3 o 4 : Take by weighing the metal nitrate of equimolar amount according to molecular formula, specifically: 4.002g of Cr(NO 3 ) 3 .9H 2 O, 4.040g of Fe(NO 3 ) 3 .9H 2 O, 2.870g of Mn(NO 3 ) 2 .4H 2 O, 2.975g of Zn(NO 3 ) 2 .6H 2 O and 2.908g of Ni(NO 3 ) 2 .6H 2 O, dissolved in 5mL distilled water, stirred evenly at room temperature to obtain a mixed solution containing five metal cations; then weighed 2.922g ethylenediaminetetraacetic acid and added to the mixed solution, stirred evenly; then put the above transparent sol in Dried in an oven at 150°C to obtain a viscous gel after evaporating water; finally put the above gel in a muffle furnace and keep it at 550°C for 1 hour to obtain a spinel crystal structure with a spe...

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Abstract

The invention discloses a five-element transition metal oxide high-entropy material for a lithium-ion battery. The high-entropy material is a five-element spinel type oxide high-entropy material formed by five transition metal positive ions, the chemical formula of the high-entropy material is (Cr0.2Fe0.2Mn0.2Zn0.2M0.2)3O4, wherein M is a divalent metal positive ion Co2+ or Ni2+. According to theinvention, a high-entropy oxide material with a spinel structure and different chemical compositions is regulated and controlled by changing the variety of divalent transition metal positive ions, sothat the electrochemical performance of the high-entropy oxide material is customized, and a nanocrystalline powder material with large specific surface area, small grain size and uniform chemical composition and microstructure is prepared through a combustion synthesis method. The five-element transition metal oxide high-entropy material for the lithium-ion battery has the advantages of large initial charge specific capacity, stable reversible specific capacity, good rate capability and good cycling stability.

Description

technical field [0001] The invention relates to the technical field of high-entropy oxide powder materials, in particular to a five-element transition metal oxide high-entropy material for lithium-ion batteries. Background technique [0002] In recent years, transition metal oxides have been used as anode materials for lithium-ion batteries. Due to their higher energy density and specific capacity than graphite, which is a commercial anode material, and the advantages of abundant sources, simple preparation, and low price, they have been favored by scientific research at home and abroad. extensive attention of the audience. [0003] For example, Chinese patent application No. 201410276284.7 discloses a single transition metal oxide M x o y (M is one or more of Fe, Mn and Cr) lithium ion battery negative electrode material. On this basis, anode materials for binary lithium-ion batteries have been developed. For example, Liu Lei prepared NiFe by hydrothermal synthesis. 2 o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/50H01M4/52H01M4/62H01M10/0525
CPCH01M4/362H01M4/483H01M4/502H01M4/523H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 冒爱琴项厚政万宇杰马瑞奇俞海云郑翠红
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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