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A kind of hollow porous nano-α-fe 2 o 3 Preparation and Application of Hexagonal Prism Materials

A hexagonal prism, hollow porous technology, applied in the field of energy materials and electrochemistry, can solve the problems of hexagonal prism materials that have not been reported, and achieve good comprehensive electrochemical performance, conducive to transmission, and controllable process parameters.

Active Publication Date: 2020-11-13
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the current study, MOFs were coated with SiO by multi-temperature heat treatment in different atmospheres. 2 or TiO 2 There are many reports on the preparation of porous metal oxides such as the shell layer, but using nano-MOFs as a template, the hydroxide layer is formed by self-etching first, and then the hollow porous nano-α-Fe is obtained by heat treatment. 2 o 3 The study of hexagonal prism materials has not been reported

Method used

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  • A kind of hollow porous nano-α-fe <sub>2</sub> o <sub>3</sub> Preparation and Application of Hexagonal Prism Materials
  • A kind of hollow porous nano-α-fe <sub>2</sub> o <sub>3</sub> Preparation and Application of Hexagonal Prism Materials
  • A kind of hollow porous nano-α-fe <sub>2</sub> o <sub>3</sub> Preparation and Application of Hexagonal Prism Materials

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Effect test

Embodiment 1

[0031]Stir 0.2 g of fumaric acid, 1 g of ferric nitrate nonahydrate and 60 mL of DMF at room temperature for 1 h to obtain a clear mixture. The mixed solution was transferred to an oil bath to react for 40 minutes, the product was centrifuged, washed with DMF and anhydrous methanol three times successively, and the obtained product was dried in a vacuum oven to obtain Fe-MIL-88A. Put 0.25g Fe-MIL-88A, 50mL water, 50mL absolute ethanol, and 0.2g sodium hydroxide in a beaker and stir for 5h. The resulting product was washed with absolute ethanol and dried in vacuum at 50°C to obtain nanohollow porous nano-α-Fe 2 o 3 Hexagonal prism material powder.

[0032] The prepared 50wt.% nano-hollow porous nano-α-Fe 2 o 3 Hexagonal prism material, 30wt.% acetylene black and 20wt.% PVDF are mixed evenly to make a slurry, evenly coated on copper foil, vacuum dried and punched into circular electrode pole pieces, with metal lithium as the counter electrode Make up the test battery. The ...

Embodiment 2

[0034] 0.4 g of fumaric acid, 1.6 g of ferric nitrate nonahydrate and 40 mL of DMF were stirred at room temperature for 40 min to obtain a clear mixture. The mixed solution was transferred to an oil bath to react for 1.5 h, the product was centrifuged, washed with DMF and anhydrous methanol three times successively, and the obtained product was dried in a vacuum oven to obtain Fe-MIL-88A. Put 0.4g Fe-MIL-88A, 100mL absolute ethanol, and 1.2g sodium hydroxide in a beaker and stir for 3h. The resulting product was washed with absolute ethanol and dried in vacuum at 50°C to obtain nanohollow porous nano-α-Fe 2 o 3 Hexagonal prism material powder.

[0035] The prepared 50wt.% nano-hollow porous nano-α-Fe 2 o 3 Hexagonal prism material, 30wt.% acetylene black and 20wt.% PVDF are mixed evenly to make a slurry, evenly coated on copper foil, vacuum dried and punched into circular electrode pole pieces, with metal lithium as the counter electrode Make up the test battery. Figure...

Embodiment 3

[0037] 1 g of fumaric acid, 3.5 g of ferric nitrate nonahydrate and 230 mL of DMF were stirred at room temperature for 1 h to obtain a clear mixture. The mixed solution was transferred to an oil bath to react for 40 minutes, the product was centrifuged, washed with DMF and anhydrous methanol three times successively, and the obtained product was dried in a vacuum oven to obtain Fe-MIL-88A. Put 1g of Fe-MIL-88A, 200mL of water, 400mL of absolute ethanol, and 3g of sodium hydroxide in a beaker and stir for 7h. The resulting product was washed with absolute ethanol and dried in vacuum at 50°C to obtain nanohollow porous nano-α-Fe 2 o 3 Hexagonal prism material powder.

[0038] The prepared 50wt.% nano-hollow porous nano-α-Fe 2 o 3 Hexagonal prism material, 30wt.% acetylene black and 20wt.% PVDF are mixed evenly to make a slurry, evenly coated on copper foil, vacuum dried and punched into circular electrode pole pieces, with metal lithium as the counter electrode Make up the ...

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Abstract

The invention discloses a preparation and application method for a nano-hollow-porous alpha-Fe2O3 hexagonal prism material, and belongs to the field of energy materials. The method includes the steps of firstly, preparing a nano Fe-MIL-88A metal-organic-framework material (MOFs) hexagonal prism material; secondly, processing by using sodium hydroxide, and through the process of self-etching, obtaining a nano material of a hollow MOFs @ Fe (OH) 3 structure; finally, conducting heat treatment in the air to obtain a hollow porous nano Fe2O3 hexagonal prism anode material. The method has the advantages of being simple in method and equipment, controllable in process parameter, high in repeatability, abundant in raw material needed by preparation, low in cost and convenient in large-scale. The prepared hollow porous nano Fe2O3 hexagonal prism anode material has high specific capacity and good cyclic stability, is an ideal anode material for a lithium ion battery, and can be widely used in the fields of portable electronic equipment, electric vehicles, aerospace technologies, national defense industry and the like.

Description

technical field [0001] The invention belongs to the field of energy materials and electrochemistry, and in particular relates to the preparation of a novel lithium-ion battery negative electrode material and its application in electrochemical energy storage and conversion. Background technique [0002] With the rapid development of industrialization and the advancement of modern technology, the storage capacity of traditional energy such as petrochemicals has been continuously reduced, and environmental pollution has intensified. However, people's demand for energy is increasing day by day. Therefore, the development of efficient and clean new energy has become a hot spot of everyone's attention. As an energy storage device, lithium-ion batteries have been widely used in energy storage fields such as various electronic devices, electric vehicle power supplies, and aerospace due to their advantages such as high capacity, long life, and portability. In terms of negative electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/52H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00H01M4/52H01M10/0525Y02E60/10
Inventor 王戈党蕊杨琼贾希来高鸿毅王芃刘丽萍
Owner UNIV OF SCI & TECH BEIJING
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