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Graphene-coated amorphous nanoflower copper vanadate and its preparation method and application

A technology of graphene coating and copper vanadate, which is applied in the field of nanomaterials and electrochemistry, can solve the problems of structural damage, low conductivity of copper vanadate, limiting development and application, etc., so as to improve the conductivity of materials and benefit the market The effects of chemical promotion and electrochemical performance improvement

Active Publication Date: 2017-01-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity of copper vanadate is low, and the structure is easily damaged during cycling, so the capacity decays rapidly during cycling, which limits its development and application.

Method used

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  • Graphene-coated amorphous nanoflower copper vanadate and its preparation method and application
  • Graphene-coated amorphous nanoflower copper vanadate and its preparation method and application
  • Graphene-coated amorphous nanoflower copper vanadate and its preparation method and application

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Embodiment 1

[0030] The preparation method of the amorphous nano-copper vanadate coated with graphene comprises the following steps:

[0031] 1) Add 1 g of polyvinylpyrrolidone (PVP) labeled K-30 and 0.1208 g of copper nitrate dihydrate into 50 ml of deionized water, and stir;

[0032] 2) Add 30 ul of hydrazine hydrate with a mass concentration of 80% to the solution obtained in step 1), and continue stirring for 40 minutes;

[0033] 3) Centrifuge the product obtained in step 2), wash it repeatedly with deionized water, disperse it into 200ml of deionized water, add 50ml of 0.02mM ammonium metavanadate solution and 6.8mg of graphene solution, and stir for 20h;

[0034] 4) Centrifuge the product obtained in step 3), wash it repeatedly with deionized water and ethanol, and finally place it in a 70°C oven for drying, and then put it in a vacuum oven for 30 minutes at 250°C to obtain a graphene package. Coated amorphous copper vanadate nanoparticles.

[0035] Taking the graphene-coated amorp...

Embodiment 6

[0072] The preparation method of the amorphous nano-copper vanadate coated with graphene comprises the following steps:

[0073] 1) Add 1 g of K-30 polyvinylpyrrolidone (PVP) and 0.1208 g of copper nitrate dihydrate into 50 ml of deionized water, and stir;

[0074] 2) Add 30 ul of hydrazine hydrate with a mass concentration of 80% to the solution obtained in step 1), and continue stirring for 40 minutes;

[0075] 3) Centrifuge the product obtained in step 2), wash it repeatedly with deionized water, disperse it into 200ml of deionized water, add 50ml of 0.02mM ammonium metavanadate solution and 6.8mg of graphene solution, and stir for 20h;

[0076] 4) Centrifuge the product obtained in step 3), wash it repeatedly with deionized water and ethanol, and finally place it in a 70°C oven for drying, and then put it in a vacuum oven for 30 minutes at 200°C to obtain a graphene package. Coated amorphous copper vanadate nanoparticles.

[0077] Taking the graphene-coated amorphous nan...

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Abstract

The invention relates to graphene-coated amorphous nano-flower copper vanadate, as well as a method and application of the nano-flower copper vanadate. The preparation method comprises the following steps of (1) adding a dispersing agent and dihydrate copper nitrate into deionized water and stirring; (2) adding hydrazine hydrate into the prepared solution and further stirring until the obtained solution becomes yellow; (3) performing centrifugal separation on the prepared product, washing and dispersing to the deionized water, and then adding an ammonium metavanadate solution and a graphene solution and uniformly stirring; and (4) performing centrifugal separation on the product prepared in the step (3), repeatedly washing by the deionized water and ethyl alcohol, finally placing in an oven for drying and placing in a vacuum chamber to remove crystal water, thereby preparing the graphene-coated amorphous nano-flower copper vanadate. The graphene-coated amorphous nano-flower copper vanadate has the beneficial effect that the electrochemical performance of copper vanadate is improved, and the material conductivity is improved and the cycling stability of the electrode material is effectively improved, so that the nano-flower copper vanadate is regarded as the potential application material of the lithium ion battery, meets requirements of green chemistry, and is good for market promotion.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and in particular relates to graphene-coated amorphous nano-flower copper vanadate and a preparation method and application thereof. The nano-flower can be used as a lithium-ion battery negative electrode active material. Background technique [0002] As a new type of high-energy electrochemical power source, lithium-ion batteries have the advantages of safety, reliability, low environmental pollution, light weight, and high specific capacity. They have become the preferred power source for high-value-added electronic products such as notebook computers, digital cameras, and mobile phones. The development of lithium-ion batteries has far-reaching significance for effectively alleviating environmental pollution problems, ensuring national energy security, and meeting people's growing living needs. [0003] Copper vanadate can undergo conversion reaction and intercalation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/5825H01M4/62Y02E60/10
Inventor 麦立强张磊谢少妹刘丰宁赵康宁
Owner WUHAN UNIV OF TECH
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