Preparation method of graphene-like MoS2/graphene combined electrode of lithium ion battery

A graphene composite and lithium-ion battery technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of long time consumption and large organic solvent consumption, and achieve the effect of simple process and high specific capacity of electrochemical lithium storage

Active Publication Date: 2015-06-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, so far, MoS with a single-layer or few-layer graphene-like structure 2 The preparation of lithium ion 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, it needs to consume a large amount of organic solvent, and it takes a long time.

Method used

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  • Preparation method of graphene-like MoS2/graphene combined electrode of lithium ion battery
  • Preparation method of graphene-like MoS2/graphene combined electrode of lithium ion battery
  • Preparation method of graphene-like MoS2/graphene combined electrode of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0030] 1) Ultrasonic disperse 2.5 mmol graphene oxide in 60 mL deionized water, then add 1.6 mmol cetyltrimethylammonium bromide cationic surfactant, and stir thoroughly;

[0031] 2) Then add 0.75g (6.19 mmol) L-cysteine ​​and 0.3g (1.24 mmol) sodium molybdate (Na 2 MoO 4 2H 2 0), and constantly stir to make L-cysteine ​​and sodium molybdate dissolve completely;

[0032] 3) Transfer the mixed liquid obtained in step (2) to a 100 mL hydrothermal reaction kettle, and add deionized water to adjust the volume to 80 mL, put the reaction kettle in a constant temperature oven, and conduct a hydrothermal reaction at 240 °C for 24 h Afterwards, let it cool down to room temperature naturally, collect the solid product by centrifugation, wash it thoroughly with deionized water, and dry it under vacuum at 100°C;

[0033] 4) The solid product obtained above was heat-treated at 800 °C for 2 h in a nitrogen / hydrogen mixed atmosphere, and the volume ratio of hydrogen in the mixed gas was 1...

Embodiment 2

[0045] 1) Ultrasonic disperse 2.5 mmol graphene oxide in 60 mL deionized water, then add 0.8 mmol cetyltrimethylammonium bromide cationic surfactant, and stir thoroughly;

[0046] 2) Then add 0.75g (6.19 mmol) L-cysteine ​​and 0.3g (1.24 mmol) sodium molybdate (Na 2 MoO 4 2H 2 0), and constantly stir to make L-cysteine ​​and sodium molybdate dissolve completely;

[0047] 3) Transfer the mixed liquid obtained in step (2) to a 100 mL hydrothermal reaction kettle, and add deionized water to adjust the volume to 80 mL, put the reaction kettle in a constant temperature oven, and conduct a hydrothermal reaction at 240 °C for 24 h Afterwards, let it cool down to room temperature naturally, collect the solid product by centrifugation, wash it thoroughly with deionized water, and dry it under vacuum at 100°C;

[0048] 4) The solid product obtained above was heat-treated at 800 °C for 2 h in a nitrogen / hydrogen mixed atmosphere, and the volume ratio of hydrogen in the mixed gas was 1...

Embodiment 3

[0055] 1) Ultrasonic disperse 2.5 mmol graphene oxide in 60 mL deionized water, then add 1.6 mmol dodecyltrimethylammonium bromide cationic surfactant, and stir thoroughly;

[0056] 2) Then add 0.75g (6.19 mmol) L-cysteine ​​and 0.3g (1.24 mmol) sodium molybdate (Na 2 MoO 4 2H 2 0), and constantly stir to make L-cysteine ​​and sodium molybdate dissolve completely;

[0057] 3) Transfer the mixed liquid obtained in step (2) to a 100 mL hydrothermal reaction kettle, and add deionized water to adjust the volume to 80 mL, put the reaction kettle in a constant temperature oven, and conduct a hydrothermal reaction at 250 °C for 24 h Afterwards, let it cool down to room temperature naturally, collect the solid product by centrifugation, wash it thoroughly with deionized water, and dry it under vacuum at 100°C;

[0058] 4) The solid product obtained above was heat-treated at 800 °C for 2 h in a nitrogen / hydrogen mixed atmosphere, and the volume ratio of hydrogen in the mixed gas was...

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Abstract

The invention relates to a preparation method of a graphene-like MoS2 / graphene combined electrode of a lithium ion battery. The preparation method comprises the following steps of: dispersing oxidized graphene ultrasonically in deionized water, stirring, and firstly adding a cationic surfactant; then adding L-aminothiopropionic acid and sodium molybdate sequentially; transferring the obtained mixed dispersing system to a hydrothermal reaction kettle, and reacting at 220-250 DEG C for 24 hours, then cooling naturally, collecting solid products centrifugally, washing with the deionized water, drying, and carrying out heat treatment in a nitrogen / hydrogen mixed atmosphere, thereby obtaining a graphene-like MoS2 and graphene combined nano material of single layer or 2-4 layers on average; and mixing the graphene-like MoS2 and graphene combined nano material and acetylene black as well as polyvinylidene fluoride into paste, and coating the paste on a copper foil and rolling, thereby obtaining the electrode. The preparation method provided by the invention is simple in process, and organic solvents are not required to be consumed; the lithium ion battery combined electrode has the advantages of high electrochemistry lithium storage specific capacity, stable circulating performance, and good high-multiplying-power charging and discharging performance.

Description

technical field [0001] The invention relates to a preparation method of composite nanomaterials, in particular to graphene-like MoS for lithium-ion batteries 2 The invention relates to a method for preparing a graphene composite electrode, which belongs to the field of preparation of inorganic composite nanomaterials and new energy materials. 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 c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1393
CPCY02E60/10
Inventor 陈卫祥黄国创王臻马琳
Owner ZHEJIANG UNIV
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