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Calcium vanadate composite material as well as preparation method and application thereof

A composite material, calcium vanadate technology, applied in the field of electrochemistry, can solve the problems of poor electrochemical performance and poor electrical conductivity such as high rate performance and cycle stability of aqueous zinc-ion batteries, and achieve excellent electrochemical performance and electrical conductivity , good capacity and high cycle stability

Active Publication Date: 2020-06-12
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commonly used vanadium-based materials are mainly materials with poor conductivity such as vanadium pentoxide and vanadium disulfide, which make the electrochemical performance of aqueous zinc-ion batteries such as high-rate performance and cycle stability poor.

Method used

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  • Calcium vanadate composite material as well as preparation method and application thereof
  • Calcium vanadate composite material as well as preparation method and application thereof
  • Calcium vanadate composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The calcium vanadate composite material of the present embodiment is made of CaV 4 o 9 The sheet material formed by compounding with graphene oxide (GO) has a mass ratio of 38.8:1.

[0033] Two, the embodiment of the preparation method of calcium vanadate composite material

Embodiment 2

[0035] The present embodiment is the preparation method of the calcium vanadate composite material in embodiment 1, comprises the following steps:

[0036] (1) Add 0.0741g of Ca(OH) 2 , 0.01g of GO was mixed with 10mL of deionized water and 10mL of glycerin, then ultrasonicated for 1h, and then stirred for 1h to obtain mixed solution A;

[0037] (2) Put 0.3679g of V 2 o 5 Added to 10 mL of deionized water and 5 mL of H 2 o 2 In the formed mixed solution (i.e. hydrogen peroxide), stir at a constant temperature at 20° C. for 2 hours to obtain mixed solution B;

[0038] (3) Mix the mixed solution A with the mixed solution B, stir it for 2 hours, place it in a hydrothermal kettle, and keep it warm at 200°C for 48 hours; then cool it naturally, then filter it, and wash the obtained solid with deionized water and ethanol successively, Dried to obtain the precursor;

[0039] (4) Precursor is first kept at 400° C. for 8 hours in an argon atmosphere, then heated to 500° C. and ke...

Embodiment 3

[0042] In this example, the calcium vanadate composite material in Example 1 is used as the positive electrode active material to assemble an aqueous zinc-ion battery, and the specific assembly method is as follows:

[0043] The calcium vanadate composite material in Example 1 is mixed with Super P (conductive carbon black), PTFE (polytetrafluoroethylene) according to the mass ratio of 6:3:1, then add 5mL alcohol and stir for 2h, and the cold wind blows the slurry to After it becomes viscous, use a spoon to press the material evenly until it is semi-cured, take it out and put it on a smooth glass plate, lubricate it with alcohol, spread weighing paper on it, and roll the film with a glass rod; after drying the prepared film, press it onto a stainless steel plate It is further dried on the net, and then cut into pieces to obtain positive electrode sheets.

[0044]Put the positive electrode sheet, glass fiber (diaphragm) and zinc sheet (negative electrode) into the shell in orde...

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Abstract

The invention belongs to the technical field of electrochemistry, particularly relates to a calcium vanadate composite material and a preparation method thereof, and further relates to application ofthe calcium vanadate composite material. The calcium vanadate composite material is a sheet-shaped composite material formed by a graphene material and CaV4O9; the mass ratio of the graphene materialto the CaV4O9 is 1:(35-40). According to the calcium vanadate composite material disclosed by the invention, the CaV4O9 and the graphene material are compounded together, so that the calcium vanadatecomposite material has relatively good conductivity and electrochemical performance. When the calcium vanadate composite material disclosed by the invention is used as a positive electrode active material of an aqueous zinc ion battery, the calcium vanadate composite material has excellent electrochemical performance, good cycling stability and excellent rate capability.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and specifically relates to a calcium vanadate composite material and a preparation method thereof, and also relates to an application of the calcium vanadate composite material. Background technique [0002] Lead-acid batteries, nickel-cadmium, nickel-metal hydride and lithium-ion batteries are more commonly used in the market now. Lead-acid and nickel-cadmium batteries contain a large amount of harmful and polluting heavy metals lead and cadmium respectively; nickel-metal hydride batteries use expensive rare metals and have a high self-discharge rate; and lithium is a rare metal with scarce resources and high prices, making lithium The application of ion batteries in large-scale electrical energy storage systems is limited. Therefore, in the field of power batteries, it is necessary to find a secondary battery system with low cost, abundant resources, and environmental protection. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00H01M4/58H01M10/36
CPCC01G31/00H01M4/5825H01M10/36C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 柳勇翟小亮张万红魏慧洁马俊卿柳竞李新利
Owner HENAN UNIV OF SCI & TECH
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