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Polyphenol-modified zinc-iron-based heterojunction oxide carbon nano lithium ion battery negative electrode composite material and preparation method thereof

A lithium-ion battery and composite material technology, applied in the field of rechargeable battery materials, can solve the problems of fast capacity decay, poor cycle and rate performance, and low charge-discharge Coulombic efficiency, and achieve mild reaction conditions, simple operation steps, and high initial The effect of Coulombic efficiency

Active Publication Date: 2021-05-04
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a polyphenol-modified zinc-iron-based heterojunction oxide carbon nano-lithium ion battery negative electrode composite material (ZnFe 2 o 4 / ZnO / C) and its preparation method to overcome the problems of poor cycle and rate performance, fast capacity decay and low charge-discharge Coulombic efficiency commonly faced by current lithium-ion battery anode materials; therefore, a lithium-ion battery is developed. Nanoscale ZnFe 2 o 4 / ZnO / C anode material, which has the advantages of high safety, good cycle stability, high capacity retention and high charge-discharge Coulombic efficiency, etc.

Method used

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  • Polyphenol-modified zinc-iron-based heterojunction oxide carbon nano lithium ion battery negative electrode composite material and preparation method thereof
  • Polyphenol-modified zinc-iron-based heterojunction oxide carbon nano lithium ion battery negative electrode composite material and preparation method thereof
  • Polyphenol-modified zinc-iron-based heterojunction oxide carbon nano lithium ion battery negative electrode composite material and preparation method thereof

Examples

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Embodiment 1

[0045] This example shows a ZnFe with heterostructure 2 o 4 / ZnO / C anode material synthesis method.

[0046] (1) Pour 2.97 g of zinc nitrate hexahydrate and 2.46 g of 2-methylimidazole into 50 mL of methanol solution, and ultrasonically dissolve them fully.

[0047] (2) After that, slowly pour the methanol solution containing 2-methylimidazole into the methanol solution containing zinc nitrate hexahydrate. At room temperature, the resulting mixed solution was stirred at 600 rpm for 24 h to form a white powder of ZIF-8. Finally, the ZIF-8 white powder was obtained by centrifugation, washed and centrifuged with methanol several times, and dried in an oven at 60 °C.

[0048] (3) Accurately weigh 0.32 g of ferric trichloride hexahydrate and fully dissolve it in 20 mL of ultrapure water, then mix it with 20 mL of tannic acid solution, and stir at 550 rpm for 2 h at room temperature, where The concentration of tannic acid was 10 mg / mL.

[0049] (4) Accurately weigh 0.32 g of ZI...

Embodiment 2

[0058] This example demonstrates a nanoscale ZnFe 2 o 4 / ZnO / C is a lithium-ion battery with negative electrode material.

[0059] The assembly process of the button battery of the present invention is completed in a vacuum glove box filled with argon, and its oxygen content and water content are both less than 0.1 ppm. company's polypropylene diaphragm.

[0060] The electrolyte is a liquid electrolyte, the solvent is ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate, the solute is lithium hexafluorophosphate, and the molar concentration of lithium salt is 1 mol / L. Before using the electrolyte, a small amount of lithium slices should be put in to remove the electrolyte. moisture in.

[0061] The above prepared ZnAl 2 o 4 / C Negative pole piece, electrolyte, metal lithium sheet and others such as glass fiber diaphragm, gasket, shrapnel and battery case are assembled into a button battery. Before the electrochemical test of the button cell, it needs to stan...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and particularly relates to a polyphenol-modified zinc-iron-based heterojunction oxide carbon nano lithium ion battery negative electrode composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing and stirring an iron source, a zinc source and a carbon source, centrifuging, drying, and carrying out heat treatment to obtain a ZnFe2O4 / ZnO / C negative electrode material. The negative electrode material provided by the invention solves the problems of poor cycle and rate performance, fast capacity fading, serious battery polarization, low charge and discharge coulombic efficiency and the like of the existing lithium ion battery negative electrode material. The ZnFe2O4 / ZnO / C has excellent electrochemical properties such as good cycling stability, excellent rate capability, small battery overpotential polarization voltage and high charge and discharge coulombic efficiency when being used as a lithium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the field of rechargeable battery materials, and in particular relates to a polyphenol-modified zinc-iron-based heterojunction oxide carbon nanometer lithium-ion battery negative electrode composite material and a preparation method thereof. Background technique [0002] In recent years, emerging electrochemical energy storage and conversion technologies such as rechargeable batteries, supercapacitors, fuel cells, and solar cells have received increasing attention and are considered as means to store and utilize these clean energies. In particular, rechargeable lithium-ion batteries (LIBs) have received extensive attention and development in power electronics engineering equipment due to their high operating potential, high energy density, light weight, long life, high efficiency, and environmental friendliness. However, in practical applications, LIBs still have limitations in terms of capacity, rate performance, cycle life, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/52H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/483H01M4/523H01M4/62H01M4/625H01M4/628H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 肖高李晓慧
Owner FUZHOU UNIV
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