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Porous iron oxide negative electrode material and preparation method and application thereof

A negative electrode material, iron oxide technology, applied in the field of porous iron oxide negative electrode materials and its preparation, can solve the problems of poor rate capability and poor cycle capacity of negative electrode materials, and achieve improved cycle life, good electrochemical performance, and uniform morphology Effect

Inactive Publication Date: 2020-04-03
河北华普化工设备科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For Fe 2 o 3 As the problem of poor cycle ability and poor rate capability of negative electrode materials, the present invention provides a preparation method of porous iron oxide negative electrode materials

Method used

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  • Porous iron oxide negative electrode material and preparation method and application thereof
  • Porous iron oxide negative electrode material and preparation method and application thereof
  • Porous iron oxide negative electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment provides a porous iron oxide negative electrode material, the preparation method of which is:

[0028] 42mg of fumaric acid and 160mg of Fe(NO 3 ) 3 9H 2 O (containing 95.8mgFe (NO 3 ) 3 ) were mixed in 8 mL of DMF to make a homogeneous precursor solution. Add 4 mg DMAP and stir at room temperature for 45 min, then place at 80°C for 20 min. Centrifuge, wash the obtained product with DMF and methanol, dry it in a 60°C drying oven for 24 hours, and then place it in a muffle furnace for calcination at 400°C for 20 minutes to obtain 31.7 mg of the initial product;

[0029] The obtained primary product was ground and mixed with 26 mg of hepta(2,3,6-tri-O-methyl)-β-cyclodextrin and 21 mg of β-cyclodextrin, and then calcined at 400° C. for 20 minutes under a hydrogen-argon mixed gas atmosphere.

Embodiment 2

[0031] This embodiment provides a porous iron oxide negative electrode material, the preparation method of which is:

[0032] The reactants 50mg terephthalic acid and 50mg fumaric acid were mixed with 200mg anhydrous ferric nitrate in 10.5mL DMF, then 10mg DMAP was added and stirred at room temperature for 30min, then placed in a drying oven at 60°C for 30min. Centrifuge, wash the obtained product with DMF and methanol, dry it in a drying oven at 100°C for 12 hours, and then place it in a muffle furnace at 500°C for 10 minutes to obtain 66.1 mg of the initial product;

[0033] The resulting primary product was mixed with 66mg 2-hydroxypropyl-β-cyclodextrin, 33mg (2-hydroxypropyl)-γ-cyclodextrin, 33mg 2,6-di-O-methyl-β-cyclodextrin Grinding and mixing are carried out, and calcined at 500° C. for 30 minutes under a hydrogen-argon gas mixture atmosphere.

Embodiment 3

[0035] This embodiment provides a porous iron oxide negative electrode material, the preparation method of which is:

[0036] The reactants 20mg terephthalic acid and 200mg anhydrous ferric nitrate were mixed in 2.1mL DMF, then 0.2mg DMAP was added and stirred at room temperature for 60min, then placed in a dry oven at 120°C for 10min. Centrifuge, wash the obtained product with DMF and methanol, dry it in a drying oven at 80°C for 18 hours, and then place it in a muffle furnace at 300°C for 20 minutes to obtain 66.0 mg of the initial product;

[0037] The obtained primary product was ground and mixed with the calcined product and 16.5 mg of γ-cyclodextrin and 16.5 mg of methyl-β-cyclodextrin, and calcined at 300° C. for 10 min under a nitrogen atmosphere.

[0038] The process flow chart of embodiment 1~3 is as figure 1 shown.

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Abstract

The invention belongs to the technical field of battery materials, and particularly relates to a porous iron oxide negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: reacting solid organic acid with ferric nitrate, performing calcining and mixing with a carbon source, and calcining the mixture again to obtain a finished product. The cycle life of the obtained finished product in the charging and discharging process of the battery is remarkably prolonged, the porous structure can increase the contact area between the finished product and an electrolyte, more active sites are provided, and the rate capability is improved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a porous iron oxide negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries (LIBs) are considered as preferred power sources for energy storage devices, transportation devices, and other electronic devices due to their high energy density, cycling stability, and design flexibility. Metal-organic frameworks (MOFs) can be used as direct electrode materials for LIBs, which are composed of metal ions and organic ligands, have the advantages of tunable porosity and large surface area, and represent a new class of hybrid porous materials. Fe 2 o 3 Belonging to one of the transition metal oxides, it has the advantages of high theoretical capacity (about 1007mAh / g), low cost and abundant resources, and can be used as an anode material for the preparation of MOFs. However Fe 2 o 3 The disa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/523H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 王波张迪孙会兰李文王秋君
Owner 河北华普化工设备科技有限公司
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