Graphene/niobium pentoxide composite electrode material and manufacturing method thereof

A technology of niobium pentoxide and composite electrodes, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of affecting the three-dimensional structure of graphene, the crystal structure of transition metal oxides, the electrical properties of electrode materials, etc., so as to shorten the transmission time. Path, preparation reproducibility, mild conditions effect

Active Publication Date: 2019-05-31
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 manufacturing method thereof
  • Graphene/niobium pentoxide composite electrode material and manufacturing method thereof
  • Graphene/niobium pentoxide composite electrode material and manufacturing method thereof

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Embodiment 1

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

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

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

[0038] (3) Add 0.5 g of sodium ascorbate to the mixture in step (2), heat to 90° C. under sufficient stirring, and reflux for 1 h.

[0039] (4) The mixed solution prepared in step (3) was transferred to a 100 mL solvothermal reaction kettle and reacted at 190° C. for 15 h. The solvothermal product was separated by suction filtration to obtain a solid, which was washed three times with deionized water and absolute ethanol, respectively, and dried under vacuum at 50°C...

Embodiment 2

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

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

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

[0045] (3) Add 0.5 g of sodium ascorbate to the mixture in step (2), heat to 90° C. under sufficient stirring, and reflux for 1 h.

[0046] (4) The mixed solution prepared in step (3) was transferred to a 100 mL solvothermal reaction kettle and reacted at 190° C. for 15 h. The solvothermal product was separated by suction filtration to obtain a solid, which was washed three times with deionized water and absolute ethanol, respectively, and dried under vacuum at 50°C...

Embodiment 3

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

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

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

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

[0053] (4) The mixed solution prepared in step (3) was transferred to a 100 mL solvothermal reaction kettle and reacted at 190° C. for 15 h. The solvothermal product was separated by suction filtration to obtain a solid, which was washed three times with deionized water and absolute ethanol, respectively, and dried under vacuum at ...

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Abstract

The invention relates to a graphene / niobium pentoxide composite electrode material and a manufacturing method thereof. The manufacturing method comprises the following steps of 1) mixing and stirringa graphene oxide dispersion liquid and a carbodiimide type compound, and carrying out heating reflux reaction; 2) dissolving niobium pentachloride in absolute ethyl alcohol, then adding into a reaction liquid obtained in the step 1), and carrying out heating reflux reaction; 3) adding a reducing agent to the reaction liquid obtained in the step 2) to carry out a reduction reaction; 4) carrying outa solvothermal reaction on the reaction liquid obtained in the step 3), and collecting solid products, washing and drying; and 5) annealing the dried solid products in the step 4) under inert gas shielding so as to obtain the graphene / niobium pentoxide composite electrode material. The graphene / niobium pentoxide composite electrode material acquired through the above manufacturing method can havea high specific capacity and high cycle performance during high-speed charge and discharge processes.

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 reunite during charge and discharge, 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 schemes. Transition metal oxides are abundant in the earth, h...

Claims

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Application Information

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Patent Type & Authority Applications(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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