A five-element transition-non-transition high-entropy oxide anode material for lithium-ion batteries

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, nickel compounds, etc., can solve the problems of reversible lithium storage performance of undiscovered high-entropy oxides, achieve uniform structure, alleviate structural damage, and simple reaction process Effect

Active Publication Date: 2022-08-02
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above research on high-entropy oxide anode materials for lithium-ion batteries mainly focuses on the rock-salt structure (Mg 0.2 co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )O, there is no report on the reversible lithium storage performance of high-entropy oxides with other crystal structures

Method used

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  • A five-element transition-non-transition high-entropy oxide anode material for lithium-ion batteries
  • A five-element transition-non-transition high-entropy oxide anode material for lithium-ion batteries
  • A five-element transition-non-transition high-entropy oxide anode material for lithium-ion batteries

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Embodiment 1

[0031] A kind of five-element transition-non-transition high-entropy oxide negative electrode material for lithium ion battery according to the present invention is prepared by solution combustion method, and its chemical composition is (Al 0.2 Co 0.2 Cr 0.2 Fe 0.2 Ni 0.2 ) 3 O 4 : Weigh an equimolar amount of metal nitrate according to the molecular formula, specifically: 3.751g of Al(NO 3 ) 3 ·9H 2 O, 2.910g of Co(NO 3 ) 2 ·6H 2 O, 4.002g of Cr (NO 3 ) 3 ·9H 2 O, 4.040g Fe (NO 3 ) 3 ·9H 2 O and 2.908 g of Ni (NO 3 ) 2 ·6H 2 O, dissolved in 10 mL of distilled water, stirred at room temperature to obtain a mixed solution containing five metal cations; then weighed 3.003 g of glycine and added it to the above mixed solution, stirred evenly to obtain a transparent sol; then placed the above transparent sol in Dry in an oven at 80°C and evaporate the water to obtain a viscous gel; finally, the above gel was placed in a gold furnace and kept at 750°C for 20min t...

Embodiment 2

[0033] A kind of five-element transition-non-transition high-entropy oxide negative electrode material for lithium ion battery according to the present invention is prepared by solution combustion method, and its chemical composition is (Mg 0.2 Cr 0.2 Fe 0.2 Mn 0.2 Zn 0.2 ) 3 O 4 : Weigh an equimolar amount of metal nitrate according to the molecular formula, specifically: 2.564g of Mg(NO 3 ) 2 ·6H 2 O, 4.002g of Cr (NO 3 ) 3 ·9H 2 O, 4.040g Fe (NO 3 ) 3 ·9H 2 O, 2.870g of Mn (NO 3 ) 2 ·4H 2 O and 2.975 g of Zn (NO 3 ) 2 ·6H 2 O, dissolved in 2.5mL of distilled water, stirred evenly at room temperature to obtain a mixed solution containing five metal cations; then weighed 1.402g of hexamethylenetetramine and added it to the above mixed solution, stirred evenly to obtain a transparent sol; Then, the above transparent sol was dried in an oven at 100°C, and the water was evaporated to obtain a viscous gel; finally, the above gel was placed in a muffle furnace a...

Embodiment 3

[0035] A five-element transition-non-transition high-entropy oxide negative electrode material for lithium ion batteries according to the present invention is prepared by a solution combustion method, and its chemical composition is (Al 0.2 Mg 0.2 Cr 0.2 Fe 0.2 Zn 0.2 )3O4: Weigh equimolar amount of metal nitrate according to the molecular formula, specifically: 3.751g of Al(NO 3 ) 3 ·9H 2 O, 2.564g of Mg(NO 3 ) 2 ·6H 2 O, 4.002g of Cr (NO 3 ) 3 ·9H 2 O, 4.040g Fe (NO 3 ) 3 ·9H 2 O and 2.975 g of Zn (NO 3 ) 2 ·6H 2 O, dissolved in 5 mL of distilled water, stirred at room temperature to obtain a mixed solution containing five metal cations; then weighed 1.877 g of glycine and 4.504 g of glucose and added it to the above mixed solution, stirred evenly to obtain a transparent sol; The transparent sol was dried in an oven at 150°C, and the water was evaporated to obtain a viscous gel; finally, the above gel was placed in a muffle furnace, and kept at 550°C for 30 ...

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Abstract

The invention provides a five-element transition-non-transition high-entropy oxide negative electrode material for lithium ion batteries, which relates to the technical field of high-entropy oxide powder materials, and the chemical formula is (X a M b Q c F 0.2 Y 0.2 Z 0.2 ) 3 O 4 , where a=0, b=c=0.2 or b=0, a=c=0.2 or c=0, a=b=0.2, X and M are non-transition metal cations Mg 2+ , Al 3+ One of them, and X and M cannot be the same non-transition metal cation; Q, F, Y and Z are transition metal cations Co 2+ , Cr 3+ , Fe 3+ , Mn 2+ , Ni 2+ , Zn 2+ One of them, and Q, F, Y and Z cannot be the same transition metal cation. Prepared by solution combustion method, it has high specific surface area, porous structure and good high-current charge-discharge characteristics.

Description

technical field [0001] The invention relates to the technical field of high-entropy oxide powder materials, in particular to a five-element transition-non-transition high-entropy oxide negative electrode material for lithium ion batteries. Background technique [0002] With the improvement of the performance of cathode materials for lithium ion batteries, higher requirements have also arisen for anode materials. Then, compared with the positive electrode material, the replacement of the negative electrode material is relatively conservative. At present, the negative electrode materials for lithium ion batteries mainly include various carbon materials (carbon fibers, graphene, carbon nanotubes, etc.), transition metal oxides, transition metal nitrides, and sulfides. and alloy materials. Among them, the theoretical lithium storage capacity of transition metal oxides is about 2 to 3 times that of carbon materials, and the advantages of low cost, environmental friendliness, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/50H01M4/52H01M10/0525C01G53/00
CPCH01M4/523H01M4/502H01M4/483H01M10/0525C01G53/006H01M2004/021H01M2004/027C01P2002/72C01P2004/03C01P2002/32C01P2006/12C01P2004/64Y02E60/10
Inventor 冒爱琴项厚政宋雅欣王捷郑翠红俞海云
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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