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Graphene/niobium pentoxide composite electrode material and preparation method thereof

A technology of niobium pentoxide and composite electrodes, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems affecting the three-dimensional structure of graphene transition metal oxide crystal structure, the influence of electrode materials on electrical properties, etc., and achieve shortened transmission route, good preparation reproducibility, and good application prospects

Active Publication Date: 2021-07-13
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, different preparation methods will affect the three-dimensional structure of graphene and the crystal structure of transition metal oxides, which in turn will affect the electrical properties of electrode materials.

Method used

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  • Graphene/niobium pentoxide composite electrode material and preparation method thereof
  • Graphene/niobium pentoxide composite electrode material and preparation method thereof
  • Graphene/niobium pentoxide composite electrode material and preparation method thereof

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Embodiment 1

[0035] In the present embodiment, a method for preparing a graphene / niobium pentoxide three-dimensional composite electrode material, the steps are as follows:

[0036] (1) Add 0.3 g of N,N'-dicyclohexylcarbodiimide to 40 mL of graphene oxide dispersion with a concentration of 5.0 mg / mL, and under sufficient stirring, heat to 90 °C and reflux for 3 h.

[0037] (2) Dissolve 0.7 g of niobium pentachloride in 10 mL of absolute ethanol, then add it to the mixed solution in step (1), heat to 90° C. under sufficient stirring, and react under reflux for 1 h.

[0038] (3) 0.5 g of sodium ascorbate was added to the mixed solution in step (2), heated to 90° C. under sufficient stirring, and reacted under reflux for 1 h.

[0039] (4) The mixed solution prepared in step (3) was transferred to a 100 mL solvothermal reactor for reaction at 190° C. for 15 h. The solvothermal product was separated by suction filtration to obtain a solid, which was successively washed three times with deioniz...

Embodiment 2

[0042] In the present embodiment, a method for preparing a graphene / niobium pentoxide three-dimensional composite electrode material, the steps are as follows:

[0043] (1) Add 0.4 g of N,N'-dicyclohexylcarbodiimide to 50 mL of graphene oxide dispersion with a concentration of 4.0 mg / mL, and under sufficient stirring, heat to 90 °C and reflux for 3 h.

[0044] (2) Dissolve 0.8 g of niobium pentachloride in 10 mL of anhydrous ethanol, then add it to the mixed solution in step (1), heat to 90° C. under sufficient stirring, and react under reflux for 1 h.

[0045] (3) 0.5 g of sodium ascorbate was added to the mixed solution in step (2), heated to 90° C. under sufficient stirring, and reacted under reflux for 1 h.

[0046] (4) The mixed solution prepared in step (3) was transferred to a 100 mL solvothermal reactor for reaction at 190° C. for 15 h. The solvothermal product was separated by suction filtration to obtain a solid, which was successively washed three times with deioni...

Embodiment 3

[0049] In the present embodiment, a method for preparing a graphene / niobium pentoxide three-dimensional composite electrode material, the steps are as follows:

[0050] (1) Add 0.4 g of N,N'-dicyclohexylcarbodiimide to 50 mL of graphene oxide dispersion with a concentration of 4.0 mg / mL, and heat to 90 °C under sufficient stirring, and reflux for 3 h.

[0051] (2) Dissolve 1.0 g of niobium pentachloride in 15 mL of absolute ethanol, then add it to the mixed solution in step (1), heat to 90° C. under sufficient stirring, and react under reflux for 1 h.

[0052] (3) Add 0.5 g of sodium ascorbate to the mixed solution in step (2), under sufficient stirring, heat to 100° C., and perform reflux reaction for 1 hour.

[0053] (4) The mixed solution prepared in step (3) was transferred to a 100 mL solvothermal reactor for reaction at 190° C. for 15 h. The solvothermal product was separated by suction filtration to obtain a solid, which was successively washed three times with deionized...

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Abstract

The invention relates to a graphene / niobium pentoxide composite electrode material and a preparation method thereof. The preparation method comprises the following steps: 1) mixing and stirring the graphene oxide dispersion liquid and carbodiimide compounds, and heating to reflux for reaction; 2) dissolving niobium pentachloride in absolute ethanol, adding to step 1) 3) adding a reducing agent to the reaction solution obtained in step 2) for a reduction reaction; 4) performing a solvothermal reaction on the reaction solution obtained in step 3), collecting a solid product, washing, and drying; 5) Annealing the dried solid product in step 4) under the protection of an inert gas to obtain the graphene / niobium pentoxide composite electrode material. The graphene / niobium pentoxide composite electrode material prepared by the preparation method can have high specific capacity and cycle performance while charging and discharging at a high speed.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a graphene / niobium pentoxide composite electrode material and a preparation method thereof. Background technique [0002] Graphene has excellent mechanical and electrical properties, and its specific capacity is as high as 744mAh / g, which is twice that of graphite. It is expected to be used in lithium-ion energy storage materials. However, due to the strong π-π stacking interaction and van der Waals force between graphene sheets, they will re-stack and agglomerate during the charge-discharge process, resulting in a sharp decline in performance. Attempts have been made to suppress the stacking of graphene by introducing spacers such as carbon nanotubes, nanoparticles, and polymers between graphene sheets. [0003] Introducing transition metal oxide nanoparticles into graphene sheets is one of the more popular research options. Transition metal oxides have abundant co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583
CPCY02E60/10
Inventor 尹香槟戴永强辛明亮李茂东黄国家丁金森吴文栋陆兵申洋唐元亮
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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