Copper pyrovanadate/nitrogen-doped graphene composite material and preparation method and application thereof

A technology of nitrogen-doped graphene and composite materials, which is applied in the field of nanomaterials, can solve the problems of electrode electrochemical instability, low first-time Coulombic efficiency, and fast capacity decay, so as to prevent volume expansion/shrinkage and aggregation, and the preparation method is simple Efficient and prevents performance degradation

Active Publication Date: 2018-12-28
TRUSDA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the current is large, the active sites of the oxygen-containing surface functional groups related to the side reactions on the surface are very active, resulting in an increase in side reactions and gas generation, resulting in electrochemical instability of the electrode.
In addition, graphene electrodes have problems such as low coulombic efficiency and fast capacity decay during the charge and discharge process.

Method used

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  • Copper pyrovanadate/nitrogen-doped graphene composite material and preparation method and application thereof
  • Copper pyrovanadate/nitrogen-doped graphene composite material and preparation method and application thereof
  • Copper pyrovanadate/nitrogen-doped graphene composite material and preparation method and application thereof

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Embodiment 1

[0039] This embodiment provides a copper pyrovanadate / nitrogen-doped graphene composite material and a preparation method of the copper pyrovanadate / nitrogen-doped graphene composite material.

[0040] The copper pyrovanadate / nitrogen-doped graphene composite material described in this embodiment includes graphene and copper pyrovanadate grown on the surface of graphene, has a three-dimensional mesoporous structure, and the specific preparation steps are as follows:

[0041] (1) Preparation of graphene oxide (GO): place the flask in an ice bath, mix 5g of graphite powder with 180mL of concentrated sulfuric acid (98wt.% H 2 SO 4 ) into the flask, and kept stirring, so that the graphite powder was completely dispersed in the concentrated sulfuric acid solution. Then slowly add 2.5g NaNO to the flask 3 and 20g KMnO 4, keep the ice-water bath environment during this feeding process, and continue to stir for 1h. Thereafter, the flask was transferred to an oil bath, and the temp...

Embodiment 2

[0049] This embodiment provides a copper pyrovanadate / nitrogen-doped graphene composite material and a preparation method of the copper pyrovanadate / nitrogen-doped graphene composite material.

[0050] The copper pyrovanadate / nitrogen-doped graphene composite material described in this embodiment includes graphene and copper pyrovanadate grown on the surface of graphene, has a three-dimensional mesoporous structure, and the specific preparation steps are as follows:

[0051] (1) Preparation of graphene oxide (GO): place the flask in an ice bath, mix 5g of graphite powder with 180mL of concentrated sulfuric acid (98wt.% H 2 SO 4 ) into the flask, and kept stirring, so that the graphite powder was completely dispersed in the concentrated sulfuric acid solution. Then slowly add 2.5g NaNO to the flask 3 and 20g KMnO 4 , keep the ice-water bath environment during this feeding process, and continue to stir for 1h. Thereafter, the flask was transferred to an oil bath, and the tem...

Embodiment 3

[0055] This embodiment provides a copper pyrovanadate / nitrogen-doped graphene composite material and a preparation method of the copper pyrovanadate / nitrogen-doped graphene composite material.

[0056] The copper pyrovanadate / nitrogen-doped graphene composite material described in this embodiment includes graphene and copper pyrovanadate grown on the surface of graphene, has a three-dimensional mesoporous structure, and the specific preparation steps are as follows:

[0057] (1) Preparation of graphene oxide (GO): place the flask in an ice bath, mix 5g of graphite powder with 180mL of concentrated sulfuric acid (98wt.% H 2 SO 4 ) into the flask, and kept stirring, so that the graphite powder was completely dispersed in the concentrated sulfuric acid solution. Then slowly add 2.5g NaNO to the flask 3 and 20g KMnO 4 , keep the ice-water bath environment during this feeding process, and continue to stir for 1h. Thereafter, the flask was transferred to an oil bath, and the tem...

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Abstract

The invention relates to the technical field of nanometer materials, in particular to a copper pyrovanadate / nitrogen-doped graphene composite material and a preparation method thereof and an application thereof in a lithium ion battery. Graphene oxide, PVP, organic amines, Cu salt and a vanadium source are mixed and dispersed in water in a certain proportion and copper pyrovanadate / nitrogen dopedgraphene composite material with three-dimensional mesoporous structure is synthesized by hydrothermal method in one step. By changing the type and amount of vanadate, the growth of copper pyrovanadate on the surface of graphene oxide is regulated, the composite material not only combines the advantages of graphene and copper pyrovanadate, but also greatly overcomes the respective shortcomings ofgraphene and copper pyrovanadate, effectively improves the conductivity of the composite material, can alleviate the volume change in the charge and discharge process, has good electrochemical performance, and can be used as the negative electrode material of lithium battery. The preparation method of the invention is simple, high efficiency and low cost, and can realize a large number of preparation.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a copper pyrovanadate / nitrogen-doped graphene composite material, a preparation method thereof, and an application thereof in lithium-ion batteries. Background technique [0002] Vanadate is considered to be a negative electrode material for lithium-ion batteries with great application prospects because of its high theoretical capacity, abundant reserves, low cost, and easy synthesis. So far, a series of vanadates with different shapes and structures have been successfully prepared, including cobalt vanadate, iron vanadate, manganese vanadate, nickel vanadate, etc., and these materials are used as negative electrodes for lithium-ion batteries material exhibited excellent electrochemical performance. Among these metal vanadates, copper pyrovanadate has attracted the attention of researchers due to its high theoretical capacity and low cost. However, the large volume change...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 曾向荣武秀斌周汉鹏周朝强周佳鑫
Owner TRUSDA IND
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