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Core-shell nickel ferrite and its preparation method, nickel ferrite@c material and its preparation method and application

A nickel ferrite, core-shell technology, applied in chemical instruments and methods, carbon preparation/purification, nanotechnology for materials and surface science, etc., can solve the problems of serious material agglomeration and poor cycle performance, and achieve product Good performance, low cost, and the effect of preventing electrochemical wear

Active Publication Date: 2021-03-26
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research by the inventors of the present disclosure found that the material agglomerates more seriously and has poor cycle performance

Method used

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  • Core-shell nickel ferrite and its preparation method, nickel ferrite@c material and its preparation method and application
  • Core-shell nickel ferrite and its preparation method, nickel ferrite@c material and its preparation method and application
  • Core-shell nickel ferrite and its preparation method, nickel ferrite@c material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) First, add 8 mL of glycerin to 40 mL of isopropanol and stir evenly, then add 0.0363 g of Ni (NO 3 ) 2 ·6H 2 O and 0.101g of Fe(NO 3 ) 3 9H 2 O, stir well at room temperature.

[0063] (2) Transfer the homogeneous liquid obtained in step (1) to a 100mL polytetrafluoroethylene-lined autoclave. After solvothermal reaction at 180°C for 6 hours, cool to room temperature naturally, and then centrifuge, wash, and dry. Obtain yellow nickel-iron glyceride ball powder; in the air, heat up to 400°C at 1°C / min for 2 hours, then cool naturally to room temperature to obtain core-shell NiFe 2 o 4 .

[0064] (3) the core-shell NiFe obtained in step (2) 2 o 4 Ultrasonic dispersion in the mixed solution of 10mL water and 20mL ethanol, add 1mLNH 3 ·H 2 O (28wt%), 1g resorcinol and 0.12mL formaldehyde, stirred for 2h. Core-shell NiFe was obtained by centrifugation, washing and drying 2 o 4 @RF composite material, under an argon atmosphere, heat up to 600 ° C for 2 h to o...

Embodiment 2

[0066] (1) First, add 8 mL of glycerin to 40 mL of isopropanol and stir evenly, then add 0.0363 g of Ni (NO 3 ) 2 ·6H 2 O and 0.101g of Fe(NO 3 ) 3 9H 2 O, stir well at room temperature.

[0067] (2) Transfer the homogeneous liquid obtained in step (1) to a 100mL polytetrafluoroethylene-lined autoclave. After solvothermal reaction at 180°C for 6 hours, cool to room temperature naturally, and then centrifuge, wash, and dry. Obtain yellow nickel-iron glyceride spherical powder; in air, heat up to 400°C at 2°C / min for calcination for 2h, then cool naturally to room temperature to obtain solid spherical NiFe 2 o 4 .

[0068] (3) the solid spherical NiFe that step (2) obtains 2 o 4 Ultrasonic dispersion in the mixed solution of 10mL water and 20mL ethanol, add 1mLNH 3 ·H 2 O (28wt%), 1g resorcinol and 0.12mL formaldehyde, stirred for 2h. Core-shell NiFe was obtained by centrifugation, washing and drying 2 o 4 @RF composite material, under an argon atmosphere, heat up ...

Embodiment 3

[0070] (1) First, add 8 mL of glycerin to 40 mL of isopropanol and stir evenly, then add 0.0363 g of Ni (NO 3 ) 2 ·6H 2 O and 0.101g of Fe(NO 3 ) 3 9H 2 O, stir well at room temperature.

[0071] (2) Transfer the homogeneous liquid obtained in step (1) to a 100mL polytetrafluoroethylene-lined autoclave. After solvothermal reaction at 160°C for 8 hours, cool to room temperature naturally, and then centrifuge, wash, and dry. Obtain yellow nickel-iron glyceride ball powder; in the air, heat up to 400°C at 1°C / min for 2 hours, then cool naturally to room temperature to obtain core-shell NiFe 2 o 4 .

[0072] (3) the solid spherical NiFe that step (2) obtains 2 o 4 Ultrasonic dispersion in the mixed solution of 10mL water and 20mL ethanol, add 1mLNH 3 ·H 2 O (28wt%), 1g resorcinol and 0.12ml formaldehyde, stirred for 2h. Core-shell NiFe was obtained by centrifugation, washing and drying 2 o 4 @RF composite material, in an argon atmosphere, under an inert atmosphere, h...

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Abstract

The disclosure provides core-shell nickel ferrite, nickel ferrite@C materials and their preparation methods and applications. The nickel-iron glycerate sphere powder is prepared by solvothermal method, and the nickel-iron glycerate sphere powder is prepared under air conditions. The temperature is raised to not lower than 350°C at a heating rate lower than 1.5°C / min for calcination to obtain core-shell nickel ferrite. The above-mentioned core-shell nickel ferrite, resorcinol, and formaldehyde were subjected to phenolic resin condensation reaction to obtain a nickel ferrite@RF composite material coated with core-shell nickel ferrite with phenolic resin. Under an inert atmosphere, the nickel ferrite@ The RF composite material was calcined and carbonized to obtain nickel ferrite@C material. Using the nickel ferrite@C core-shell material provided by the present disclosure as a lithium ion battery negative electrode has the advantages of uniform appearance, good dispersion, high specific capacity, and stable cycle performance.

Description

technical field [0001] The disclosure belongs to the technical field of lithium-ion batteries, and relates to lithium-ion battery negative electrode materials, in particular to core-shell nickel ferrite and its preparation method, nickel ferrite@C material, its preparation method and its application. Background technique [0002] The information disclosed in this Background section is only intended to increase the understanding of the general background of the disclosure, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes prior art that is already known to those skilled in the art. [0003] Energy is the foundation of human survival and economic development. However, with the continuous and rapid development of the world economy, problems such as energy shortage and environmental pollution have gradually deepened, and the contradiction between energy supply and demand has become increasingly prominent. New energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00C01B32/05H01M4/36H01M4/525H01M4/62H01M10/0525B82Y30/00B82Y40/00H01M4/02
CPCC01G53/00C01B32/05H01M4/366H01M4/525H01M4/625H01M4/628H01M10/0525B82Y30/00B82Y40/00H01M2004/021H01M2004/027C01P2004/80C01P2004/32C01P2004/30C01P2002/72C01P2004/03C01P2004/04C01P2004/64C01P2004/62C01P2006/40Y02E60/10C01P2004/84C01G53/40H01M4/0404H01M4/1391H01M4/131H01M4/134H01M4/1397H01M4/5825H01M4/62
Inventor 周国伟刘田莉顾少楠宫庆华王茜
Owner QILU UNIV OF TECH
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