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Sulfur and selenium compound coated with conducting polymer and oxidized graphene and preparation and application thereof

A conductive polymer and selenium compound technology, applied in the field of electrochemistry, can solve the problems of poor electrochemical performance, achieve high conductivity, improve electrochemical performance, and low price

Active Publication Date: 2019-04-05
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even though selenium sulfide has a very broad prospect, it is used as a positive electrode material because of the shuttle effect caused by its electrode reaction intermediate product lithium polysulfide and lithium polyselenide, which are easily soluble in the electrolyte and the volume change during charging and discharging. leading to poor electrochemical performance

Method used

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  • Sulfur and selenium compound coated with conducting polymer and oxidized graphene and preparation and application thereof
  • Sulfur and selenium compound coated with conducting polymer and oxidized graphene and preparation and application thereof
  • Sulfur and selenium compound coated with conducting polymer and oxidized graphene and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Preparation of double-layer coated positive electrode materials for selenium sulfide batteries: 2g of polyvinylpyrrolidone (surfactant) and 0.346g of sodium selenite were dissolved in 50mL of water, and 0.96g of sodium sulfide was ultrasonically dissolved in 30mL of water and added To the above solution, then add 2mol / L HCl dropwise until the pH reaches 2. React for 12 hours, centrifuge and wash.

[0030] Then dissolve the sample after centrifugation in 100mL water, add 120uL 3,4-ethylenedioxythiophene, 0.12g camphorsulfonic acid, and 0.6g ammonium persulfate in sequence, and change to dark green after coating for 12 hours. After centrifugation, dissolve it in 100mL water. At the same time, 0.1 mg / mL graphene oxide aqueous solution was added, stirred and coated for 2 hours, centrifuged, dried at 80°C, and the sample was dried to obtain a composite material of selenium sulfide / polythiophene / graphene oxide. Then the composite material, acetylene black, and polyvinylidene...

Embodiment 2

[0033] Preparation of double-coated positive electrode materials for selenium sulfide batteries: 2 g of polyvinylpyrrolidone and 0.346 g of sodium selenite were dissolved in 50 mL of water, and 0.96 g of sodium sulfide was ultrasonically dissolved in 30 mL of water and added to the above solution. Then add 2mol / L HCl dropwise until the pH reaches 2. React overnight, centrifuge and wash.

[0034] Then dissolve the centrifuged sample in 100mL water, add 120uL aniline, 240uL concentrated hydrochloric acid, and 0.2g ammonium persulfate in sequence, and change to dark green after coating for 12 hours. After centrifugation, dissolve it in 100mL water, and add 0.1mg / mL graphene oxide at the same time The aqueous solution was stirred and coated for 2 hours, centrifuged, dried at 80° C., and the sample was dried to obtain a composite material of selenium sulfide / polyaniline / graphene oxide. Then the composite material, acetylene black, and polyvinylidene fluoride were uniformly mixed a...

Embodiment 3

[0037] Preparation of double-coated positive electrode materials for selenium sulfide batteries: 2 g of polyvinylpyrrolidone and 0.346 g of sodium selenite were dissolved in 50 mL of water, and 0.96 g of sodium sulfide was ultrasonically dissolved in 30 mL of water and added to the above solution. Then add 2mol / L HCl dropwise until the pH reaches 3. React overnight, centrifuge and wash.

[0038] Then, the centrifuged sample was dissolved in 100mL water, and 100uL pyrrole, 0.15g FeCl 3 , 0.02g sodium lauryl sulfate, coated for 12h to turn dark green, dissolved in 100mL water after centrifugation, and added 0.1mg / mL graphene oxide aqueous solution at the same time, stirred and coated for two hours, centrifuged, dried at 80°C The sample was obtained to obtain a composite material of selenium sulfide / polypyrrole / graphene oxide. Then the composite material, acetylene black, and polyvinylidene fluoride were uniformly mixed at a mass ratio of 7:2:1, and ball milled to obtain a unif...

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Abstract

The invention discloses a sulfur and selenium compound coated with conducting polymer and graphene oxide and preparation and application thereof. A sulfur and selenium compound is generated based on the sodium selenite and sodium sulphide reaction, the sulfur and selenium compound is coated with a layer of conducting polymer to improve the conductivity and then is coated with a layer of graphene oxide to obtain composite materials of selenium sulfide / conductive polymer / graphene oxide. The conducting polymer is introduced in the selenium sulfide positive electrode materials to obviously improvethe conductivity of the selenium sulfide and relieve the shuttle effect caused by diffusion loss of polysulfide and polyselenide. Besides, the graphene oxide of the coating layer can more efficientlyimprove the specific capacity of the selenium sulfide battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, in particular to a sulfur selenium compound coated with a conductive polymer and graphene oxide and its preparation and application. Background technique [0002] In today's society, human society is mainly facing two major crises: environmental issues and energy issues, so the development of renewable energy and green new energy has become a common cognition of our human society. Today, the development of high-performance batteries has become a heavy burden on the shoulders of scientists, and electric vehicles that use green energy and pollution-free have gradually moved from the research and development stage to the general public. Lithium-sulfur batteries are widely concerned due to their high theoretical specific capacity, but the conductivity of sulfur is poor, and the theoretical specific capacity of selenium, which is in the same main group as sulfur and has high conductivity, is ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 张开龙潘红琳王莉王迪江钰蒋政言王磊王良彪周全法
Owner JIANGSU UNIV OF TECH
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