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Graphene-zinc-based oxide composite material, preparation method thereof and application of graphene-zinc-based oxide composite material in lithium ion battery negative electrode material

A composite material, graphene technology, applied in the field of lithium-ion batteries, can solve the problems of electrode crushing capacity, attenuation, poor conductivity, etc.

Pending Publication Date: 2021-05-14
赣州市力道新能源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they suffer from poor electrical conductivity and large volume changes during cycling, which easily lead to electrode crushing and rapid capacity fading.
How to improve the electrochemical performance of Zn-based oxides remains a major challenge

Method used

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  • Graphene-zinc-based oxide composite material, preparation method thereof and application of graphene-zinc-based oxide composite material in lithium ion battery negative electrode material
  • Graphene-zinc-based oxide composite material, preparation method thereof and application of graphene-zinc-based oxide composite material in lithium ion battery negative electrode material
  • Graphene-zinc-based oxide composite material, preparation method thereof and application of graphene-zinc-based oxide composite material in lithium ion battery negative electrode material

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preparation example Construction

[0027] The present invention also provides a method for preparing the graphene-zinc-based oxide composite material described in the above technical solution, comprising the following steps:

[0028] mixing graphene oxide with an organic solvent to obtain a graphene oxide dispersion;

[0029] Mixing the graphene oxide dispersion, zinc source, iron source and organic ligands, performing a hydrothermal reaction to obtain a composite material precursor;

[0030] The composite material precursor is calcined to obtain a graphene-zinc-based oxide composite material.

[0031] The invention adopts a hydrothermal-high-temperature solid-phase method to prepare graphene-zinc-based oxide composite materials, the preparation process is simple and convenient, and it is suitable for popularization and application.

[0032] The invention mixes the graphene oxide and the organic solvent to obtain the graphene oxide dispersion liquid. In the present invention, the organic solvent is preferably...

Embodiment 1

[0044] Preparation of graphene-zinc-based oxide composite ZnO / ZnFe by hydrothermal method-high temperature solid state method 2 o 4 @RGO-100 nanocomposite material: Among them, 100 represents the addition of 100mg graphene oxide in hydrothermal reaction;

[0045] Disperse 0.1g of graphene oxide in a mixed solution of 100mL N,N-dimethylformamide and ethanol by ultrasonic cell disruption, wherein the volume ratio of N,N-dimethylformamide and ethanol is 5:3, to obtain Graphene oxide dispersion;

[0046] 0.63mmol Zn(NO 3 ) 2 ·6H 2 O, 0.68mmol iron acetylacetonate and 0.23mmol terephthalic acid were added to the graphene oxide dispersion, and transferred to an autoclave lined with Teflon, heated to 100°C, and hydrothermally reacted for 6 hours; the resulting system Wash the centrifuge with N,N-dimethylformamide and ethanol in sequence, and dry the solid material obtained by centrifugation at 80°C overnight;

[0047] The composite material precursor was placed in a calciner, a...

Embodiment 2

[0050] Preparation of graphene-zinc-based oxide composite ZnO / ZnFe by hydrothermal method-high temperature solid state method 2 o 4 @RGO-50 nanocomposite material: Among them, 50 represents hydrothermal reaction adding 50mg graphene oxide)

[0051] Disperse 0.05g graphene oxide in a mixed solution of 100mL N,N-dimethylformamide and ethanol by ultrasonic cell disruption, wherein the volume ratio of N,N-dimethylformamide and ethanol is 5:3, to obtain Graphene oxide dispersion;

[0052] 0.63mmol Zn(NO 3 ) 2 ·6H 2 O, 0.68mmol iron acetylacetonate and 0.23mmol terephthalic acid were added to the graphene oxide dispersion, and transferred to an autoclave lined with Teflon, heated to 100°C, and hydrothermally reacted for 6 hours; the resulting system Centrifuge with N,N-dimethylformamide and ethanol in turn, and dry the solid material obtained by centrifugation at 80°C overnight to obtain a composite material precursor;

[0053] The composite material precursor was placed in a ...

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Abstract

The invention provides a graphene-zinc-based oxide composite material, a preparation method thereof and application of the graphene-zinc-based oxide composite material in a lithium ion battery negative electrode material, and relates to the technical field of lithium ion batteries. The graphene-zinc-based oxide composite material provided by the invention comprises reduced graphene oxide and ZnO-ZnFe2O4 nanoparticles grown on the surface of the reduced graphene oxide, wherein the distance between every two adjacent ZnO-ZnFe2O4 nano particles is 2 to 92 nm. According to the invention, ZnO-ZnFe2O4 nanoparticles are dispersed on the surface of reduced graphene oxide, and gaps among the ZnO-ZnFe2O4 nanoparticles provide enough buffer space for volume expansion caused by intercalation and deintercalation of lithium ions, so that the material has better cycle performance and rate capability; and the reduced graphene oxide also greatly improves the conductivity of the material.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a graphene-zinc-based oxide composite material, a preparation method thereof, and an application in negative electrode materials of lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in everyday portable electronic devices and also play a vital role in electric vehicles and smart grids. However, the theoretical specific capacity of commercial graphite-based materials as negative electrodes is limited (372 mAh / g). Therefore, it is crucial to seek next-generation anode materials with high capacity. [0003] Zn-based mono- and bi-metal oxides (e.g. ZnO, ZnMn 2 o 4 , ZnFe 2 o 4 and ZnCo 2 o 4 ) has received increasing attention due to its high specific capacity. However, they suffer from poor electrical conductivity and large volume changes during cycling, which easily lead to electrode crushing and rapid capacity fading. ...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/525H01M4/62H01M10/0525C01G49/00C01G9/02C01B32/19B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C01G9/02C01G49/00C01P2002/72C01P2004/03C01P2004/64C01P2004/80C01B32/19H01M4/485H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 李小康赖微栋李斌苑举君李晓凡彭光怀郭华彬邱实皇
Owner 赣州市力道新能源有限公司
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