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High capacity and stable cyclic performance lithium ion battery electrode and preparation method thereof

A lithium-ion battery and cycle performance technology, applied to battery electrodes, circuits, electrical components, etc., to achieve the effects of enhancing electrochemical performance, enhancing electrochemical lithium storage performance, and improving electrical conductivity

Active Publication Date: 2014-08-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, so far, with graphene nanosheets / MoS 2 Nanocomposites are used as electrochemically active materials to prepare electrochemical intercalation / delithiation electrodes for lithium-ion batteries with high capacity and high cycle stability.

Method used

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  • High capacity and stable cyclic performance lithium ion battery electrode and preparation method thereof
  • High capacity and stable cyclic performance lithium ion battery electrode and preparation method thereof
  • High capacity and stable cyclic performance lithium ion battery electrode and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] A preparation method of lithium-ion battery electrodes with high capacity and stable cycle performance: 1) Preparation of graphite oxide nanosheets: disperse 2.5mmol (0.03g) of graphite powder into 20mL of concentrated sulfuric acid under 0°C ice bath, stir Add 0.03g KMnO 4 , the added KMnO 4 The mass of graphite is 3 times that of graphite, stir for 25 minutes, the temperature rises to about 30°C, add 45ml of deionized water, stir for 20 minutes, add 12ml 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 2.5mmol (0.606g) sodium molybdate in 63ml deionized water to form a 0.04M solution, add 12.5mmol of thiourea and stir evenly, the ratio of thiourea to sodium molybdate is 5.0:1, Then the 1st) step is added in this solution with the prepared graphite oxide nanosheet of graphite of 2.5mmol (0.03g), the amount of t...

Embodiment 2

[0037] A preparation method of lithium-ion battery electrodes with high capacity and stable cycle performance: 1) Preparation of graphite oxide nanosheets: disperse 2.5mmol (0.03g) of graphite powder into 25mL of concentrated sulfuric acid under 0°C ice bath, stir Add KMnO under 4 , the added KMnO 4 The mass of graphite is 4 times that of graphite, stir for 40 minutes, the temperature rises to about 30 ℃, add 45ml of deionized water, stir for 20 minutes, add 10ml of 30% H 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;

[0038] 2) Dissolve 1.25mmol (0.303g) sodium molybdate in 63ml deionized water to form a 0.02M solution, add 10mmol of thioacetamide and stir evenly, wherein the ratio of the mass of thioacetamide to sodium molybdate is 8: 1, then the 1st) step is added in this solution with the prepared graphite oxide nanoplatelet of 2.5mmol (0.0...

Embodiment 3

[0043] A preparation method of lithium-ion battery electrodes with high capacity and stable cycle performance: 1) Preparation of graphite oxide nanosheets: disperse 5.0mmol (0.06g) of graphite powder into 25mL of concentrated sulfuric acid under 0°C ice bath, stir Add KMnO under 4 , the added KMnO 4The mass of graphite is 3.5 times that of graphite, stir for 60 minutes, the temperature rises to about 45 °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 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) sodium molybdate in 63ml of deionized water to form a 0.02M solution, add 15mmol of thioacetamide and stir evenly, the ratio of thioacetamide to sodium molybdate is 12 : 1, then the graphite oxide nanosheets prepared by the graphite of 1) step in 5.0mmol (0.06g...

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Abstract

The invention discloses a high capacity and stable cyclic performance lithium ion battery electrode and a preparation method thereof. The invention is characterized in that: the electrode comprises the following components in percentage by mass: 75 to 85 percent of graphene nano slice / molybdenum disulfide (MoS2) compound nano material serving as an active substance, and 5 to 10 percent of acetylene black and 5 to 15 percent of polyvinylidene fluoride; and the mass ratio of the graphene nano slice to the MoS2 compound nano material in the compound nano material active substance is (1 to 1)-(4 to 1). The preparation method for 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

technical field [0001] The present invention relates to lithium ion battery electrode and preparation method thereof, especially with graphene nano sheet / MoS 2 Composite nanomaterials are used as electrodes of lithium-ion batteries with high capacity and stable cycle performance prepared by electrochemically active materials, and 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 Patents(China)
IPC IPC(8): H01M4/136H01M4/58H01M4/62H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 陈卫祥常焜陈涛李辉马琳
Owner ZHEJIANG UNIV
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