Preparation method of single-layer MoS2/grapheme combined electrode of lithium ion battery

A graphene composite and composite electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of long time, large consumption of organic solvents, high sensitivity, etc., and achieve a simple process and high electrochemical lithium storage capacity. Effect

Inactive Publication Date: 2014-05-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, so far, single-layer MoS 2 The preparation of lithium ions is mainly based on the method of intercalation and stripping of lithium ions. This method has the following disadvantages: it is highly sensitive to the environment such as air and moisture, and it needs to consume a large amount of organic solvents and takes a long time.

Method used

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  • Preparation method of single-layer MoS2/grapheme combined electrode of lithium ion battery
  • Preparation method of single-layer MoS2/grapheme combined electrode of lithium ion battery
  • Preparation method of single-layer MoS2/grapheme combined electrode of lithium ion battery

Examples

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Effect test

Embodiment 1

[0020] Example 1 1) Ultrasonic disperse 10.76mmol graphene oxide in 200mL deionized water, add 0.01mol cetyltrimethylammonium bromide cationic surfactant (concentration 0.05M), and stir well; 2) Then Add 1.4g (5.38mmol) ammonium thiomolybdate into it, stir well, slowly add 20mL of hydrazine hydrate dropwise under stirring, continue stirring and heating to 95°C, and react for 5h under constant stirring and reflux conditions, Simultaneous and separate reduction of ammonium thiomolybdate and graphene oxide to MoS 2 and graphene, the solid product was collected by centrifugation, fully washed with deionization, and then vacuum-dried at 100°C; 3) The obtained solid product was heat-treated at 800°C for 2h in a nitrogen / hydrogen mixed atmosphere, and the hydrogen in the mixed gas The volume ratio is 10%, and the monolayer MoS is prepared after heat treatment 2 Composite nanomaterials with graphene. The final product obtained after heat treatment was characterized by XRD, SEM and H...

Embodiment 2

[0027] Example 2 1) Ultrasonic disperse 10.76mmol of graphene oxide in 200mL of deionized water, add 0.004mol of cetyltrimethylammonium bromide cationic surfactant (concentration 0.02M), and stir well; 2) Then Add 1.4g (5.38mmol) ammonium thiomolybdate into it, stir well, slowly add 20mL of hydrazine hydrate dropwise under stirring, continue to stir and heat to 95°C, and react for 6h under constant stirring and reflux conditions, Simultaneous and separate reduction of ammonium thiomolybdate and graphene oxide to MoS 2 and graphene, the solid product was collected by centrifugation, fully washed with deionization, and then vacuum-dried at 100°C; 3) The obtained solid product was heat-treated at 800°C for 2h in a nitrogen / hydrogen mixed atmosphere, and the hydrogen in the mixed gas The volume ratio is 10%, and the monolayer MoS is prepared after heat treatment 2 Composite nanomaterials with graphene. The final product obtained after heat treatment was characterized by XRD, SEM...

Embodiment 3

[0031] Example 3 1) Ultrasonic disperse 10.76mmol graphene oxide in 200mL deionized water, add 0.004mol dodecyltrimethylammonium bromide cationic surfactant (concentration 0.02M), and stir well; 2) Then Add 1.4g (5.38mmol) ammonium thiomolybdate into it, stir well, slowly add 20mL of hydrazine hydrate dropwise under stirring, continuously stir and heat to 95°C, react under constant stirring and reflux for 8h, Simultaneous and separate reduction of ammonium thiomolybdate and graphene oxide to MoS 2 and graphene, the solid product was collected by centrifugation, fully washed with deionization, and then vacuum-dried at 100°C; 3) The obtained solid product was heat-treated at 800°C for 2h in a nitrogen / hydrogen mixed atmosphere, and the hydrogen in the mixed gas The volume ratio is 10%, and the monolayer MoS is prepared after heat treatment 2 Composite nanomaterials with graphene. The final product obtained after heat treatment was characterized by XRD, SEM and HRTEM, and the c...

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Abstract

The invention relates to a preparation method of a single-layer MoS2 / grapheme combined electrode of lithium ion battery. The prepared method comprises the following steps of: ultrasonically dispersing graphene oxide in deionized water, sequentially adding cationic surfactant and sulfo-ammonium molybdate while stirring, slowly dripping hydrazine hydrate, reacting under 95-DEG C circulation reflux, respectively reducing the sulfo-ammonium molybdate and the graphene oxide into MoS2 and grapheme, centrifuging and collecting a solid product, washing, drying, carrying out heat treatment in a nitrogen / hydrogen mixing gas, and obtaining composite nanometer material of single-layer MoS2 and the grapheme; and mixing the composite nanometer material of single-layer MoS2 and the grapheme, acetylene black and polyvinylidene fluoride into mash, coating the mash on a copper foil, thus obtaining an electrode by rolling the mash. According to the preparation method disclosed by the invention, the technology is simple, the organic solvent is not needed to be consumed, and the combined electrode of the lithium ion battery has the advantages that the electrochemical lithium storage specific capacity is high, the circulation performance is stable, and the high-rate charge-discharge performance is good.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery composite electrode, especially a single-layer MoS for a lithium-ion battery 2 / The preparation method of graphene composite electrode. Background technique [0002] Lithium-ion batteries have excellent properties such as high specific energy, no memory effect, and environmental friendliness, and have been widely used in portable mobile appliances such as mobile phones and notebook computers. As a power battery, lithium-ion batteries also have broad application prospects in electric bicycles and electric vehicles. At present, graphite materials (such as: graphite microspheres, natural modified graphite and artificial graphite, etc.) are mainly used as negative electrode materials for lithium-ion batteries. These graphite materials have good cycle stability, but their capacity is low. The theoretical capacity of graphite is 372mAh / g. The new generation of lithium-ion batteries put...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1393H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 陈卫祥王臻黄国创马琳
Owner ZHEJIANG UNIV
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