Grapheme/WS2 nanocomposite electrode of lithium ion battery and manufacturing method thereof

A technology of composite nanomaterials and lithium-ion batteries, applied in battery electrodes, circuits, electrical components, etc., to achieve ultra-stable cycle performance, mild reaction conditions, high electrical conductivity and thermal conductivity

Active Publication Date: 2011-10-12
ZHEJIANG TIANHONG LITHIUM-ION BATTERY CO LTD
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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 WS 2 There is n...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 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;

[0022] 2) Dissolve 1.25mmol of tungstic acid in 63ml of deionized water to form a 0.02M solution, add 6.25mmol of L-cysteine ​​and stir evenly, the ratio of L-cysteine ​​to tungstic acid is 5.0: 1, then add the graphite oxide nanosheets prepared by 1.25mmol (0.015g) of graphite in step 1) into the solution, the amount of the used graphite raw material and the mass ratio of tungstic acid in the solution are 1: 1, ultrasonic Tr...

Embodiment 2

[0028] 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;

[0029] 2) Dissolve 1.25mmol of tungstic acid in 63ml of deionized water to form a 0.02M solution, add 7.5mmol of L-cysteine ​​and stir evenly, wherein the ratio of L-cysteine ​​to tungstic acid is 6 : 1, then the graphite oxide nanosheets prepared by the graphite of 2.5mmol (0.03g) in step 1) are added in the solution, the amount of the graphite raw material used is 2: 1 with the mass ratio of tungstic...

Embodiment 3

[0035] 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;

[0036] 2) Dissolve 1.25mmol of tungstic acid in 63ml of deionized water to form a 0.02M solution, add 15mmol of L-cysteine ​​and stir well, the ratio of L-cysteine ​​to tungstic acid is 12:1 , then the graphite oxide nanosheets prepared by 5.0mmol (0.06g) of graphite in step 1) are added in the solution, the amount of the graphite raw material used is 4:1 with the mass ratio of tungstic acid in the sol...

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Abstract

The invention discloses a grapheme/WS2 nanocomposite electrode of a lithium ion battery and a manufacturing method thereof. The electrode comprise 75-85% of nanocomposite active materials consisting of grapheme nano-sheets and WS2, 5-10% of acetylene black and 10% of polyvinylidene fluoride in percentage by mass, wherein the amount-of-material rate of the grapheme nano-sheets to the WS2 nano materials in the nanocomposite active materials is (1:1)-(4:1). The manufacturing method of the electrode comprises the following steps: using a chemical oxidation method to manufacture graphite oxide nano-sheets by taking graphite as a raw material; under the existence of the graphite oxide nano-sheets, synthesizing by using a hydrothermal in-situ reduction method so as to obtain the grapheme nano-sheets/WS2 nanocomposite; and manufacturing the electrode by taking the grapheme nano-sheets/WS2 nanocomposite as the active material. The electrode has the advantages of high electrochemical lithium storage reversible capacity and stable circulation property, and can be widely applied to next-generation lithium ion batteries.

Description

[0001] The present invention relates to lithium ion battery electrode and preparation method thereof, especially use graphene nano sheet and WS 2 The composite material is a lithium-ion battery electrode with high capacity and stable cycle performance prepared as an electrochemical active material, and belongs 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. These graphite materials have ...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/10
Inventor 杨兰生孙高潮章涛周雨方陈卫祥
Owner ZHEJIANG TIANHONG LITHIUM-ION BATTERY CO LTD
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