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Graphene/MoS2 compound nano material lithium ion battery electrode and preparation method thereof

A composite nanomaterial, lithium-ion battery technology, applied in the direction of non-aqueous electrolyte battery electrodes, etc., to achieve the effect of enhancing electrochemical performance, mild reaction conditions, and strong mechanical properties

Inactive Publication Date: 2011-08-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the application of L-cysteine ​​to assist in the synthesis of graphene and MoS 2 There is no public report on the method of compounding nanomaterials and preparing electrodes for lithium-ion batteries

Method used

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  • Graphene/MoS2 compound nano material lithium ion battery electrode and preparation method thereof
  • Graphene/MoS2 compound nano material lithium ion battery electrode and preparation method thereof
  • Graphene/MoS2 compound nano material lithium ion battery electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Graphene / MoS 2 Composite nanomaterial lithium ion battery electrode preparation method:

[0035] 1) Preparation of graphite oxide nanosheets: Disperse 1.25mmol (0.015g) of graphite powder into 20mL of concentrated sulfuric acid in an ice bath at 0°C, and add 0.03g of KMnO 4 , the added KMnO 4 The mass of graphite is 3 times that of graphite, stir for 30 minutes, the temperature rises to about 30°C, add 45ml of deionized water, stir for 20 minutes, add 10ml of 30% H 2 o 2 , stirred for 5 minutes, centrifuged, and repeatedly washed with a mass concentration of 5% HCl solution, deionized water and acetone to obtain graphite oxide nanosheets;

[0036] 2) Dissolve 1.25mmol (0.303g) sodium molybdate in 63ml of deionized water to form a 0.02M solution, add 6.25mmol of L-cysteine ​​and stir evenly, the mixture of L-cysteine ​​and sodium molybdate The ratio of mass is 5.0: 1, then the 1st) step is added in this solution with the prepared graphite oxide nanosheet of graphite ...

Embodiment 2

[0042] Graphene / MoS 2 Composite nanomaterial lithium ion battery electrode preparation method:

[0043] 1) Preparation of graphite oxide nanosheets: Disperse 2.5mmol (0.03g) of graphite powder into 25mL of concentrated sulfuric acid in an ice bath at 0°C, and add KMnO 4 , the added KMnO 4 The mass of graphite is 4 times that of graphite, stir for 40 minutes, the temperature rises to about 33 ° C, add 50ml of deionized water, stir for 25 minutes, add 12ml of H2O with a mass concentration of 30% 2 o 2 , stirred for 5-10 minutes, centrifuged, and repeatedly washed with a mass concentration of 5% HCl solution, deionized water and acetone to obtain graphite oxide nanosheets;

[0044] 2) Dissolve 1.25mmol (0.303g) of sodium molybdate in 63ml of deionized water to form a 0.02M solution, add 7.5mmol of L-cysteine ​​and stir evenly, wherein the amount of L-cysteine ​​and sodium molybdate The ratio of the amount of substance is 6: 1, then the graphite oxide nanosheets prepared by th...

Embodiment 3

[0050] Graphene / MoS 2 Composite nanomaterial lithium ion battery electrode preparation method:

[0051] 1) Preparation of graphite oxide nanosheets: Disperse 5.0 mmol (0.06 g) of graphite powder into 25 mL of concentrated sulfuric acid in an ice bath at 0 °C, and add KMnO 4 , the added KMnO 4 The mass of graphite is 4 times that of graphite, stir for 50 minutes, the temperature rises to about 35°C, add 50ml of deionized water, stir for 30 minutes, add 20ml of H2O with a mass concentration of 30% 2 o 2 , stirred for 15 minutes, centrifuged, and repeatedly washed with a mass concentration of 5% HCl solution, deionized water and acetone to obtain graphite oxide nanosheets;

[0052] 2) Dissolve 1.25mmol (0.303g) sodium molybdate in 63ml deionized water to form a 0.02M solution, add 15mmol of L-cysteine ​​and stir evenly, the amount of L-cysteine ​​and sodium molybdate The ratio is 12: 1, then the 1st) step adds in this solution the graphite oxide nanosheet that the graphite of...

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Abstract

The invention discloses a graphene / molybdenum disulfide (MoS2) compound nano material lithium ion battery electrode and a preparation method thereof. The electrode comprises the following components in percentage by mass: 75 to 85 percent of compound nano material serving as an active substance, of a graphene nano slice and MoS2, and 5 to 10 percent of acetylene black and 10 percent of polyvinylidene fluoride; and the mass ratio of the graphene nano slice to the MoS2 nano material in the compound nano material active substance is (1 to 1)-(4 to 1). The preparation method of the electrode comprises the following steps of: preparing an oxidized graphite nano slice by using graphite as a raw material by a chemical oxidization method; synthesizing by a one-step hydrothermal in-situ reduction method in the presence of the oxidized graphite nano slice to obtain a graphene nano slice / MoS2 compound nano material; and finally, preparing the electrode by using the graphene nano slice / MoS2 compound nano material as the active substance. The electrode has high electrochemical lithium storage reversible capacity and cyclic stabilization performance, and can be widely applied to new generation lithium ion batteries.

Description

[0001] The invention relates to lithium-ion battery electrodes and preparation methods thereof, especially the use of graphene nanosheets and MoS 2 Composite materials, as lithium-ion battery electrodes with high capacity and stable cycle performance prepared from electrochemically active substances, belong to the field of new chemical power sources and new energy materials. Background technique [0002] Lithium-ion batteries have excellent properties such as high specific energy, no memory effect, and environmental friendliness. They have been widely used in portable mobile appliances such as mobile phones and laptop computers. As power batteries, lithium-ion batteries also have broad application prospects in electric bicycles and electric vehicles. At present, the negative electrode materials of lithium-ion batteries mainly use graphite materials (such as graphite microspheres, natural modified graphite and artificial graphite, etc.). These graphite materials have good cycle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 陈卫祥常焜陈涛李辉马琳
Owner ZHEJIANG UNIV
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