Alkaline metal vanadate electrode material and preparation method and application thereof

A technology of alkaline earth metal and vanadate, applied in the field of nanomaterials and electrochemistry, to achieve excellent rate performance, high tap density and low cost

Active Publication Date: 2017-05-31
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Alkaline-earth metal vanadate, which is used as an anode active material for sodium-ion batteries, and its preparation methods and related research work are still rarely reported

Method used

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  • Alkaline metal vanadate electrode material and preparation method and application thereof
  • Alkaline metal vanadate electrode material and preparation method and application thereof
  • Alkaline metal vanadate electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation of alkaline earth metal vanadate electrode material comprises the following steps:

[0035] 1) Weigh 1.0mmol Ca(OH) 2 (or Sr(OH) 2 ) into 10ml of glycerin, then add 10ml of deionized water, and stir with a magnetic stirrer for 60 minutes;

[0036] 2) Weigh 2.0mmol V 2 o 5 Add to 10ml deionized water, then add 5ml 30% hydrogen peroxide, stir with a magnetic stirrer for 60 minutes;

[0037] 3) Add the solution obtained in step 1) to the solution obtained in step 2), and stir with a magnetic stirrer for 2 hours;

[0038] 4) Transfer the solution obtained in step 3) to a 50ml reaction kettle, heat it in water at 200°C for 2 days, cool it down to room temperature naturally, and take out the black product;

[0039] 5) The product obtained in step 4) is centrifuged, washed with absolute ethanol for 1-2 times, and then dried in an oven at 60-70°C for 12-24 hours;

[0040] 6) heat-treat the dried product obtained in step 5) at 400° C. in an argon atmosphere f...

Embodiment 2

[0050] The preparation of alkaline earth metal vanadate electrode material comprises the following steps:

[0051] 1) Weigh 1.0mmol Ca(OH) 2 (or Sr(OH) 2 ) into 5ml glycerin, then add 15ml deionized water, and stir with a magnetic stirrer for 60 minutes;

[0052] 2) Weigh 2.0mmol V 2 o 5 Add to 10ml deionized water, then add 5ml 30% hydrogen peroxide, stir with a magnetic stirrer for 60 minutes;

[0053] 3) Add the solution obtained in step 1) to the solution obtained in step 2), and stir with a magnetic stirrer for 2 hours;

[0054] 4) Transfer the solution obtained in step 3) to a 50ml reaction kettle, heat it in water at 200°C for 4 days, cool it down to room temperature naturally, and take out the black product;

[0055] 5) The product obtained in step 4) is centrifuged, washed with absolute ethanol for 1-2 times, and then dried in an oven at 60-70°C for 12-24 hours;

[0056] 6) heat-treat the dried product obtained in step 5) at 400° C. in an argon atmosphere for 5 ...

Embodiment 3

[0059] The preparation of alkaline earth metal vanadate electrode material comprises the following steps:

[0060] 1) Weigh 1.2mmol Ca(OH) 2 (or Sr(OH) 2 ) into 10ml of glycerin, then add 10ml of deionized water, and stir for 40 minutes with a magnetic stirrer;

[0061] 2) Weigh 2.0mmol V 2 o 5 Add to 10ml of deionized water, then add 5ml of 30% hydrogen peroxide, stir with a magnetic stirrer for 40 minutes;

[0062] 3) Add the solution obtained in step 1) to the solution obtained in step 2), and stir with a magnetic stirrer for 2 hours;

[0063] 4) Transfer the solution obtained in step 3) to a 50ml reaction kettle, heat it in water at 190°C for 2 days, cool it down to room temperature naturally, and take out the black product;

[0064] 5) The product obtained in step 4) is centrifuged, washed with absolute ethanol for 1-2 times, and then dried in an oven at 60-70°C for 12-24 hours;

[0065] 6) heat-treat the dried product obtained in step 5) at 450°C for 5 hours in a n...

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Abstract

The invention relates to a preparation method and application of alkaline metal vanadate. The alkaline metal vanadate can be used as an anode active material of a sodium ion battery, and is a micrometer flower-like material which is formed by stacking calcium vanadate or strontium vanadate nanometer flakes. A molecular formula of the calcium vanadate is CaV4O9, a molecular formula of the strontium vanadate is SrV4O9, the diameter is 2 to 3mu m, and the thickness of each calcium vanadate or strontium vanadate nanometer flake is 10 to 30nm. The preparation method has the advantages that the calcium vanadate and strontium vanadate electrode active material is prepared by a hydrothermal method and post heat treatment, and is used as a novel anode active material of the sodium ion battery; the electrochemical property is excellent, the specific capacity is higher, the cyclic stability is good, and the rate capability is excellent; the tapping density is large, and the commercial potential is great; the technology is simple, the cost is low, the green and environment-friendly effects are realized in the synthesizing process, and the preparation method is suitable for popularizing in market.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and electrochemistry, and in particular relates to a preparation method and application of a class of alkaline earth metal vanadate, which can be used as a negative electrode active material of a sodium ion battery. Background technique [0002] The energy crisis caused by the dwindling reserves of fossil fuels and the environmental problems caused by the excessive use of fossil energy have become two thorny problems in the process of social development. In this context, the development of renewable energy has become an inevitable trend. How to realize the efficient use of renewable energy is the key to solving the two major problems of energy crisis and environmental pollution in the future. Large-scale energy storage systems can effectively collect and store unstable and discontinuous renewable energy, and then achieve stable and continuous output when necessary. Large-scale energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/483H01M10/054Y02E60/10
Inventor 麦立强徐小明吴沛捷
Owner WUHAN UNIV OF TECH
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