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Lithium ion battery electrode made of graphene/SnS2 composite nanometer material and preparation method thereof

A technology of composite nanomaterials and lithium-ion batteries, which is applied in the direction of battery electrodes, circuits, electrical components, etc., to achieve mild reaction conditions, enhance and improve performance, and enhance the effects of electrochemical performance

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

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Problems solved by technology

But so far, using L-cysteine ​​to synthesize graphene and SnS 2 Composite nanomaterials, and using graphene and SnS 2 The research on composite nanomaterials as active materials to prepare lithium-ion battery electrodes has not been publicly reported.

Method used

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  • Lithium ion battery electrode made of graphene/SnS2 composite nanometer material and preparation method thereof
  • Lithium ion battery electrode made of graphene/SnS2 composite nanometer material and preparation method thereof
  • Lithium ion battery electrode made of graphene/SnS2 composite nanometer material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] Graphene / SnS 2 Lithium-ion battery electrode preparation method of composite nanomaterials: 1) Preparation of graphite oxide nanosheets: disperse 4.0mmol (0.048g) 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;

[0034] 2) Dissolve 1.94g (16mmol) L-cysteine ​​in 160ml deionized water, then add 0.70g (2mmol) tin tetrachloride (SnCl 4 ·5H 2 O), and stirred to make it dissolve, L-cysteine ​​and SnCl in the mixed solution 4 The molar ratio is 8:1. Then the 1st) step is added in this solution with the graphite oxide nanosheet prepared by the graph...

Embodiment 2

[0040] Graphene / SnS 2 Lithium-ion battery electrode preparation method of composite nanomaterials: 1) Preparation of graphite oxide nanosheets: Disperse 2.0mmol (0.024g) 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;

[0041] 2) Dissolve 1.22g (10mmol) L-cysteine ​​in 150ml deionized water, then add 0.70g (2mmol) tin tetrachloride (SnCl 4 ·5H 2 O), and stirred to make it dissolve, L-cysteine ​​and SnCl in the mixed solution 4 The mol ratio of 2.0mmol (0.024g) is added in this solution by the graphite oxide nanosheet that t...

Embodiment 3

[0045] Graphene / SnS 2 Lithium-ion battery electrode preparation method of composite nanomaterials: 1) Preparation of graphite oxide nanosheets: disperse 4.5mmol (0.054g) 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 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;

[0046] 2) Dissolve 1.454g (12mmol) L-cysteine ​​in 150ml deionized water, then add 0.52g (1.5mmol) tin tetrachloride (SnCl 4 ·5H 2 O), and stirred to make it dissolve, L-cysteine ​​and SnCl in the mixed solution 4 The mol ratio is 8: 1, then the graphite oxide nanosheets prepared by the graphite of 1) step with ...

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Abstract

The invention discloses a lithium ion battery electrode made of a graphene / SnS2 composite nanometer material and a preparation method thereof. The lithium ion battery electrode is characterized in that the active substance of the electrode is the graphene / SnS2 composite nanometer material, and the other components of the electrode are acetylene black and polyvinylidene fluoride. The lithium ion battery electrode comprises the following components in percentage by weight: 75-85% of the composite nanometer material active substance, 5-10% of the acetylene black and 10% of the polyvinylidene fluoride; and the mass ratio of the graphene to SnS2 nanometer material in the composite nanometer material active substance is (1:1)-(4:1). The electrode preparation method disclosed by the invention comprises the following steps: preparing a graphite oxide nanometer sheet by taking graphite as a raw material by virtue of a chemical oxidation method; in the presence of the graphite oxide nanometer sheet, synthetizing to obtain the graphene / SnS2 composite nanometer material by virtue of a one-step hydrothermal in-situ reduction method; and finally, taking the graphene / SnS2 composite nanometer material as the active substance to prepare the electrode. The electrode disclosed by the invention has the advantages of higher electrochemical lithium storage capacity and excellent cyclical stability and can be widely used in the new generation of lithium ion batteries.

Description

technical field [0001] The present invention relates to lithium ion battery electrode and preparation method thereof, relate in particular to using graphene / SnS 2 The composite nanomaterial is a lithium-ion battery electrode with high capacity and stable cycle performance prepared by an active material, and belongs to the field of new chemical power source and its preparation technology. 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 ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397H01M4/62
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 陈卫祥常焜陈涛马琳李赫
Owner ZHEJIANG UNIV
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