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Vanadium pentoxide/graphene composite material and preparation method and application thereof

A technology of vanadium pentoxide and composite material, applied in the field of vanadium pentoxide/graphene composite material and its preparation, can solve the problems such as the preparation of composite positive electrode that cannot be directly transferred to zinc ion battery, and achieves the improvement of atom utilization rate, Less time consuming and less expensive

Inactive Publication Date: 2019-07-05
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there are many substantial differences between zinc-ion batteries and sodium-ion batteries: mainly in ionic radius, electrolyte system, voltage range, etc.; based on these differences, the preparation method of the composite positive electrode of the above-mentioned sodium-ion batteries cannot be directly transferred For the preparation of composite positive electrodes for zinc-ion batteries, further improvements are needed according to the actual situation of zinc-ion batteries.

Method used

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  • Vanadium pentoxide/graphene composite material and preparation method and application thereof
  • Vanadium pentoxide/graphene composite material and preparation method and application thereof
  • Vanadium pentoxide/graphene composite material and preparation method and application thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1 Preparation of a vanadium pentoxide-graphene composite material

[0046] Proceed as follows:

[0047] (1) Mix 500g of vanadium pentoxide and 100g of graphene oxide (the mass ratio of the two is 5:1), disperse it in 2100g of water, then seal it in a hydrothermal kettle, and react for about 12 hours at 180±5°C ;

[0048] (2) Freeze-drying to obtain a solid product, which is a vanadium pentoxide-graphene composite material.

[0049] Effect verification:

[0050] 1. Characterize the morphology of the obtained vanadium pentoxide-graphene composite material. For the results, see figure 1 . The vanadium pentoxide-graphene composite material is composed of graphene with an average length of 5 μm and spherical non-hydrated vanadium pentoxide. The size of the vanadium pentoxide is 200 nanometers. The vanadium pentoxide accounts for 50-99% of the total mass of the composite material.

[0051] 2. For the structural characterization of the obtained vanadium pento...

Embodiment 2

[0056] Embodiment 2 Preparation of a vanadium pentoxide-graphene composite material

[0057] Embodiment 2 provides a vanadium pentoxide-graphene composite material, the preparation method of which is basically the same as that of embodiment 1, the difference being that the mass ratio of the raw material vanadium pentoxide to graphene oxide is 10:1.

[0058] Effect verification:

[0059] The vanadium pentoxide-graphene composite material is made into a working electrode according to the above method, and the corresponding electrical performance test is carried out. The results are as follows: when charging and discharging at 1C, the first discharge specific capacity is 281mAh / g; when charging and discharging at the above rate , the capacity can maintain more than 78% of the initial capacity after 1000 repeated charge and discharge.

Embodiment 3

[0060] Embodiment 3 Preparation of a vanadium pentoxide-graphene composite material

[0061] This embodiment provides a vanadium pentoxide-graphene composite material, the preparation method of which is basically the same as that of Example 1, the difference is that the mass ratio of the raw material vanadium pentoxide to graphene oxide is 0.5:1.

[0062] Effect verification:

[0063] The vanadium pentoxide-graphene composite material was made into a working electrode according to the method provided above and the corresponding electrical properties were tested. The results are as follows: when charging and discharging at 1C, the first discharge specific capacity is 268mAh / g; When discharging, the capacity can maintain more than 76% of the initial capacity after 1000 times of repeated charge and discharge.

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Abstract

The invention relates to a vanadium pentoxide / graphene composite material and a preparation method and an application thereof. The vanadium pentoxide-graphene composite material comprises graphene with three-dimensional conductive network configuration and vanadium pentoxide loaded on the surface and internal part of graphene. The specific capacity is higher than 200mAh / g (high utilization rate) when the composite material is used as a positive electrode material of zinc-ion batteries, and the composite material has good cycling performance. In addition, the composite material further has thecharacteristics of low raw material cost, high repeatability, simple preparation process and less time consumption, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a vanadium pentoxide / graphene composite material and a preparation method and application thereof, belonging to the technical field of zinc ion batteries. Background technique [0002] Zinc-ion batteries have excellent electrochemical performance compared to other types of batteries. Generally speaking, it is mainly manifested in the following three points: (1) Zinc-ion batteries not only have high energy density, but also have high power density. According to the constant current charging and discharging results, energy density and power density calculation formula, it can be calculated that its power density can reach up to 12kW / kg, which is much higher than that of ordinary batteries on the market. The energy density of zinc-ion batteries can reach up to 320W h / kg , is about 15 times that of a supercapacitor. (2) The cost of zinc-ion batteries is low. The manufacturing process of the zinc-ion battery is simple, and it can...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/054H01M4/139
CPCH01M4/139H01M4/362H01M4/485H01M4/625H01M10/054H01M2004/028Y02E60/10
Inventor 杨树斌丁军伟李彬
Owner BEIHANG UNIV
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