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Vanadium disulfide/graphene composite material and preparation method therefor

A composite material, vanadium disulfide technology, used in nanotechnology for materials and surface science, secondary batteries, electrochemical generators, etc., can solve problems such as low conductivity and low volume expansion

Inactive Publication Date: 2016-02-24
DONGGUAN JOYSUN NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

vs. 2 It can be used as the negative electrode material of the battery in the lithium battery. Theoretical calculation shows that VS 2 As the negative electrode material of lithium battery, the capacity can reach 466mAh / g (Y.Jing, Z.Zhou, C.R.Cabrera and Z.Chen, TheJournalofPhysicalChemistryC, 2013, 117(48):25409~25413.), however VS 2 The relatively low conductivity of itself and the volume expansion caused by the intercalation and extraction of lithium ions make VS 2 Has low cycle reversibility

Method used

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  • Vanadium disulfide/graphene composite material and preparation method therefor
  • Vanadium disulfide/graphene composite material and preparation method therefor
  • Vanadium disulfide/graphene composite material and preparation method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0028] First, the preparation of graphene oxide is as follows: 20 mL of 98% concentrated sulfuric acid is added to the Erlenmeyer flask, and after being cooled to room temperature, it is placed in an ice-water bath at 0° C. to continue cooling until the temperature is lower than 4° C., and 2 mmol of natural flake graphite and Add 0.56mmol sodium nitrate to cold concentrated sulfuric acid, stir continuously in a magnetic stirrer to dissolve it completely, add 0.05mmol potassium permanganate to the above solution to obtain mixed solution B, stir for 2h; heat the temperature of mixed solution B to 35 Continue to stir for 30 min at ℃; then, add 40 mL of deionized water to the mixed solution B, raise the temperature to 90 °C and stir for 1 h, then add 4 mL of 30% hydrogen peroxide and stir for 10 min; to obtain the reaction product, centrifuge the reaction product with 1M HCl, deionized water and acetone respectively Wash several times to obtain graphene oxide sheets;

[0029] Seco...

Embodiment 2

[0035] First, the preparation of graphene oxide is specifically: 20mL98% concentrated sulfuric acid is added in the Erlenmeyer flask, after cooling, it is placed in an ice-water bath at 0°C, 4mmol of natural flake graphite and 0.112mmol of sodium nitrate are added to the cold concentrated sulfuric acid, Stir continuously in a magnetic stirrer to dissolve completely, add 0.1mmol potassium permanganate to the above solution, stir for 2h; raise the temperature to 35°C and continue stirring for 30min; then, add 40mL deionized water, heat up to 90°C and stir 1h, then add 4mL of 30% hydrogen peroxide and stir for 10min; finally, wash with 1M HCl, deionized water and acetone for several times to obtain graphene oxide sheets;

[0036] Second, make VS 2 / Graphene composite material: 2mmol ammonium metavanadate (NH 4 VO 3 ) into 15mL of deionized water, then adjust the pH value of the solution by adding 3mL of ammonia water, and continuously stir with a magnetic stirrer to completely ...

Embodiment 3

[0040] First, for the preparation of graphene oxide, add 20mL of 98% concentrated sulfuric acid into the Erlenmeyer flask, place it in an ice-water bath at 0°C after cooling, add 1mmol of natural flake graphite and 0.28mmol of sodium nitrate into the cold concentrated sulfuric acid, and stir under magnetic force Stir continuously in the container to dissolve it completely, add 0.025mmol potassium permanganate to the above solution to obtain mixed solution B, stir for 2h; raise the temperature to 35°C and continue stirring for 30min; then, add 40mL deionized water and heat up to 90°C Stir for 1 hour, then add 4 mL of 30% hydrogen peroxide and stir for 10 minutes; finally, wash with 1M HCl, deionized water and acetone for several times to obtain graphene oxide sheets;

[0041] Second, make VS 2 / Graphene composite material: 2mmol ammonium metavanadate (NH 4 VO 3 ) into 15mL of deionized water, then adjust the pH value of the solution by adding 3mL of ammonia water, and continu...

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Abstract

The invention relates to the technical field of new energy materials, and in particular to a vanadium disulfide / graphene composite material and a preparation method therefor. The preparation method comprises the following steps: dissolving a vanadium source into water and uniformly mixing with an excessive amount of sulfur source to obtain a mixed solution A, uniformly mixing graphene oxide with the mixed solution A, performing reaction at the temperature of 150-200 DEG C, and after the reaction to obtain the vanadium disulfide / graphene composite material. The preparation method is simple in process, mature in technology, available in equipment and quite good for the commercial promotion; according to the prepared vanadium disulfide / graphene composite material, the shortcomings of the vanadium disulfide and graphene are overcome by each other; the chemical activity of the material is improved, and the vanadium disulfide / graphene composite material can be used as the chemical active material to be applied to lithium ion battery negative electrodes; and the obtained lithium ion battery is quite good in circulation reversibility and relatively high in specific capacity.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a vanadium disulfide / graphene composite material for lithium ion batteries and a preparation method thereof. Background technique [0002] With the rapid development of the global economy and the continuous growth of population, the problem of energy shortage has become one of the most serious problems facing mankind. At this stage, the electricity we use mainly comes from the combustion of fossil fuels, but in the process of burning fossil fuels A large amount of toxic gas is produced, which has seriously affected our environment and the health of the public. Therefore, finding renewable energy sources and safe and reliable energy storage devices has become a very important issue. As an energy storage device, lithium-ion batteries have a series of advantages such as high energy storage density, long cycle life, environmental friendliness, no memory effect, safety a...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/5815H01M4/587H01M10/0525Y02E60/10
Inventor 钟绵增汤欣平李树深李京波
Owner DONGGUAN JOYSUN NEW ENERGY
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