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Sulfur-base composite material containing graphene and preparation method thereof

A composite material and graphene technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as uneven composite, difficult control of graphene state, complex process, etc., to achieve improved cycle stability and adjustable material morphology Controllable, easy-to-synthesize effects

Active Publication Date: 2013-04-17
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a graphene-containing sulfur-based compound in order to overcome defects such as complex process, non-uniform compounding and difficulty in controlling the state of graphene during the synthesis process in the existing synthesis method of graphene-sulfur composite material. Composite material and its preparation method

Method used

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  • Sulfur-base composite material containing graphene and preparation method thereof
  • Sulfur-base composite material containing graphene and preparation method thereof
  • Sulfur-base composite material containing graphene and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) adding the graphene oxide of 5 parts by mass into water of 100 parts by mass and ultrasonication for 1 hour to obtain an aqueous dispersion of graphene oxide;

[0030] (2) adding 25 parts by mass of sulfur and 50 parts by mass of sodium sulfide to 100 parts by mass of water, heating it to 60°C and stirring until the sulfur and sodium sulfide are all dissolved to prepare a polysulfide ion solution;

[0031] (3) Then the water dispersion of graphene oxide is mixed with the polysulfide ion solution under stirring, continue to stir for 7 hours; then add excessive 5% dilute hydrochloric acid to adjust the pH=2 of the solution, continue to stir for 4 hours and filter, use Rinse with deionized water and then dry to obtain graphene-sulfur sulfur-based composites.

[0032] The obtained graphene-containing sulfur-based composite material has a mass content of graphene of 70% and an elemental sulfur content of 30%. The composite cathode material was tested by TEM, and it can ...

Embodiment 2

[0035] (1) the graphene oxide of 3 mass parts is added to the water of 100 mass parts and ultrasonic 5 hours, makes the water dispersion of graphene oxide;

[0036] (2) 20 parts by mass of sulfur and 30 parts by mass of lithium sulfide are added to 100 parts by mass of water, and it is heated to 50 ° C and stirred until sulfur and lithium sulfide are all dissolved, to prepare a polysulfide ion solution;

[0037] (3) then the aqueous dispersion of graphene oxide and polysulfide ion solution are mixed under stirring, and continue stirring for 7 hours; then add excess 5% dilute sulfuric acid to adjust pH=2 of the solution, continue to stir after 4 hours and filter, use The graphene-sulfur sulfur-based composites were obtained by rinsing with ionized water and then drying.

[0038] In the obtained graphene-containing sulfur-based composite material, the mass content of graphene is 80%, and the elemental sulfur content is 20%.

Embodiment 3

[0040] (1) the graphene oxide of 10 parts by mass is dispersed in the water of 200 parts by mass and ultrasonic for 3 hours to obtain the aqueous dispersion of graphene oxide;

[0041] (2) the sulfur of 50 parts by mass and the sodium sulfide of 100 parts by mass are added to the water of 200 parts by mass, and it is heated to 60 ℃ and stirred until sulfur and potassium sulfide are all dissolved, making polysulfide ion solution;

[0042] (3) then the aqueous dispersion of graphene oxide and polysulfide ion solution are mixed under stirring, and continue to stir for 7 hours; then add excessive 5% dilute hydrochloric acid to adjust pH=2 of the solution, continue to stir after 4 hours and filter, use The graphene-sulfur sulfur-based composites were obtained by rinsing with ionized water and then drying.

[0043] The obtained graphene-containing sulfur-based composite material, wherein the mass content of graphene is 30%, and the elemental sulfur content is 70%.

[0044] The grap...

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Abstract

The invention provides a sulfur-base composite material containing graphene and a preparation method thereof. The sulfur-base composite cathode material is a binary composite material AxBy, wherein, B is dispersed uniformly on the surface of A in the form of nano particle state, A represents graphene, B represents elementary sulfur, x is no less than 30 % and no larger than 80 %, y is no less than 20 % and no larger than 70 %, and x+y=100 %. The preparation method is characterized in that: graphene oxide is reduced to graphene with using polysulfide ions, and a graphene-sulfur composite material with nano sulfur particles uniformly dispersing on the surface of the graphene is obtained. The sulfur-base composite material can be prepared into anode and lithium metal cathode to make up a secondary lithium / sulfur cell which can charge and discharge at room temperature. The sulfur-base composite material containing graphene has a reversible specific capacity which can reach to 710 mAh / g, and has good cycling stability.

Description

technical field [0001] The invention relates to a positive electrode material for a secondary battery and a preparation method thereof, in particular to a graphene-containing sulfur-based composite material and a preparation method thereof. Background technique [0002] With the increasing global energy shortage and the deterioration of environmental climate, people's demand for clean energy is becoming more and more urgent. Batteries, as energy storage and conversion devices, play an irreplaceable role in the process of clean energy utilization. Compared with other commonly used secondary batteries, lithium-ion batteries have attracted extensive attention because of their high mass-specific energy and volume-specific energy. Low cost, high energy density, high safety, long cycle life, and green secondary batteries are the hotspots in the development of next-generation lithium batteries. [0003] The currently commercialized positive electrode materials are mainly layered o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 王久林尹利超杨军努丽燕娜
Owner SHANGHAI JIAOTONG UNIV