Lithium ion battery electrode made of graphene/ MoS2 and amorphous carbon and preparation method

A lithium-ion battery, amorphous carbon technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., to achieve the effects of enhancing stability, inhibiting agglomeration and pulverization, and improving cycle performance

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

[0006] However, so far, with graphene nanosheets / MoS 2 The composite nanomaterials of graphene-like nanosheets and amorphous carbon are used as electrochemically active materials to prepare lithium-ion battery electrodes with high capacity and high cycle stability.

Method used

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  • Lithium ion battery electrode made of graphene/ MoS2 and amorphous carbon and preparation method
  • Lithium ion battery electrode made of graphene/ MoS2 and amorphous carbon and preparation method
  • Lithium ion battery electrode made of graphene/ MoS2 and amorphous carbon and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Graphene / MoS 2 Preparation method of lithium-ion battery electrode with amorphous carbon

[0030] 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 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;

[0031] 2) Dissolve 1.25mmol (0.303g) of sodium molybdate in 63ml of deionized water to form a 0.02M solution, add 6.25mmol of thiourea and 1g (5.56mmol) of glucose, stir evenly, and the mixture of thiourea and sodium molybdate The ratio of mass is 5.0: 1, and the ratio of the mass of glucose to sodium molybdate is 4.45: 1, then the graph...

Embodiment 2

[0037] Graphene / MoS 2 Preparation method of lithium-ion battery electrode with amorphous carbon

[0038] 1) Preparation of graphite oxide nanosheets: Disperse 2.5mmol (0.03g) of graphite powder into 24mL of concentrated sulfuric acid in an ice bath at 0°C, and add KMnO 4 , the added KMnO 4 The mass of graphite is 3.5 times that of graphite, stir for 40 minutes, the temperature rises to about 34 ° C, add 45ml of deionized water, stir for 25 minutes, add 12ml of H2O with a mass concentration of 30% 2 o 2 , stirred for 7 minutes, centrifuged, and repeatedly washed with a mass concentration of 5% HCl solution, deionized water and acetone to obtain graphite oxide nanosheets;

[0039] 2) Dissolve 1.25mmol (0.303g) of sodium molybdate in 63ml of deionized water to form a 0.02M solution, add 7.5mmol of thioacetamide and 1g (5.56mmol) of glucose and stir well, in which thioacetamide and molybdenum The ratio of the amount of substance of sodium molybdate is 6: 1, and the ratio of th...

Embodiment 3

[0044] Graphene / MoS 2 Preparation method of lithium-ion battery electrode with amorphous carbon

[0045] 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 15ml of H2O with a mass concentration of 30% 2 o 2 , stirred for 10 minutes, centrifuged, and repeatedly washed with a mass concentration of 5% HCl solution, deionized water and acetone to obtain graphite oxide nanosheets;

[0046] 2) Dissolve 1.25mmol (0.303g) sodium molybdate in 63ml of deionized water to form a 0.02M solution, add 10mmol of thioacetamide and 1g (5.56mmol) of glucose and stir well, thioacetamide and molybdenum The ratio of the mass of sodium molybdate is 8: 1, the ratio of the mass of glucose to sodium mol...

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Abstract

The invention discloses a lithium ion battery electrode made of graphene/ MoS2 and amorphous carbon and a preparation method thereof. The lithium ion battery electrode is characterized in that the active material of the electrode is a composite nano-material of graphene nano-sheets/ MoS2 graphene nano-sheets and amorphous carbon, and the balance is acetylene black and polyvinylidene fluoride; the mass percentage of each component is: 75-85% of active material of composite nano-material, 5-10%of acetylene black and 10-15% of polyvinylidene fluoride, wherein in the composite nano-material, the mass percentage of the graphene nano-sheets is 4.2-15%, the mass percentage of the MoS2 graphene nano-sheets is 44-65%, and the balance is the amorphous carbon, wherein the mass ratio of the graphene nano-sheets and the MoS2 graphene nano-sheets is 1 to 1-4 to 1. The preparation method of the electrode comprises the following steps of: using graphite as a raw material to prepare graphite oxide nano-sheets with a method of chemical oxidation; in the presence of the graphite oxide nano-sheets, compounding to obtain the composite nano-material of the graphene nano-sheets/ MoS2 graphene nano-sheets and the amorphous carbon in a hydro-thermal way; and finally using the composite nano-material of the graphene nano-sheets/ MoS2 graphene nano-sheets and the amorphous carbon as an electrochemical active material to prepare the electrode. The electrode has high electrochemical lithium intercalating reversible capacity and good stable circulation property and is widely applied to the new generation of lithium ion batteries.

Description

technical field [0001] The present invention relates to lithium ion battery electrode and preparation method, especially use graphene / MoS 2 Composite nanomaterials with amorphous carbon are used as electrodes of lithium-ion batteries with high capacity and stable cycle performance prepared by electrochemical active materials, which 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, 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 陈卫祥常焜马琳李辉
Owner ZHEJIANG UNIV
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