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A kind of sulfur/polypyrrole/graphene/carbon nanotube composite film, preparation method and application thereof

A carbon nanotube composite and graphene composite technology, applied in the direction of positive electrodes, active material electrodes, structural parts, etc., can solve the problems of complex and time-consuming processes, and achieve improved rate performance, improved cycle stability, and increased charging and discharging. effect of speed

Active Publication Date: 2020-12-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the preparation process of patent application CN106450245A, the oxidation of pyrrole and the reduction of graphene oxide involve conventional reagents and methods. However, the use of conventional redox agents often causes environmental burdens and introduces additional functional groups. Therefore, each experimental step requires several times of washing and drying. Removing excess oxidizing agent or reducing agent, the process is complex and time-consuming

Method used

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  • A kind of sulfur/polypyrrole/graphene/carbon nanotube composite film, preparation method and application thereof
  • A kind of sulfur/polypyrrole/graphene/carbon nanotube composite film, preparation method and application thereof
  • A kind of sulfur/polypyrrole/graphene/carbon nanotube composite film, preparation method and application thereof

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Embodiment 1

[0080] A high-performance lithium-sulfur battery cathode material, the material includes sulfur / polypyrrole / graphene / carbon nanotube composites, the steps of the technical solution adopted in this embodiment are as follows:

[0081] 1) the preparation of graphene oxide is the same as step 1 in comparative example 1);

[0082] 2) Purification and acidification of carbon nanotubes are the same as step 2 in Comparative Example 2);

[0083] 3) Preparation of polypyrrole / graphene / carbon nanotube composite film (PCG):

[0084] Add 5.6mL of the graphene oxide aqueous solution prepared in step 1) to 200mL of ethanol and deionized water mixed solution (the volume ratio of ethanol and deionized water is 1:1), ultrasonically disperse at a frequency of 100kW for 1h; add 2.8mL of pyrrole, After stirring evenly, it was aged at room temperature for three days, and the color of the solution changed from brownish yellow to brownish black to obtain a mixed suspension of polypyrrole / graphene; 0...

Embodiment 2

[0095] A high-performance lithium-sulfur battery cathode material, the material includes sulfur / polypyrrole / graphene / carbon nanotube composites, the steps of the technical solution adopted in this embodiment are as follows:

[0096] 1) the preparation of graphene oxide is the same as step 1 in comparative example 1);

[0097] 2) Purification and acidification of carbon nanotubes are the same as step 2 in Comparative Example 2);

[0098] 3) Preparation of polypyrrole / graphene / carbon nanotube composite film (PCG):

[0099] Add 5.6mL of the graphene oxide aqueous solution prepared in step 1) to 300mL of the mixed solution of ethanol and deionized water (the volume ratio of ethanol and deionized water is 1:2), ultrasonicate at a frequency of 100kW for 2h; add 5.6mL of pyrrole, and stir well Afterwards, aging at room temperature for 48h, the solution color changes from brownish yellow to brownish black to obtain a polypyrrole / graphene mixed suspension; in the above suspension, add...

Embodiment 3

[0105] A high-performance lithium-sulfur battery cathode material, the material includes sulfur / polypyrrole / graphene / carbon nanotube composites, the steps of the technical solution adopted in this embodiment are as follows:

[0106] 1) the preparation of graphene oxide is the same as step 1 in comparative example 1);

[0107] 2) Purification and acidification of carbon nanotubes are the same as step 2 in Comparative Example 2);

[0108] 3) Preparation of polypyrrole / graphene / carbon nanotube composite film (PCG):

[0109]Add 5.6mL of the graphene oxide aqueous solution prepared in step 1) to 300mL of the mixed solution of ethanol and deionized water (the volume ratio of ethanol and deionized water is 2:1), ultrasonically disperse at a frequency of 100kW for 0.5h; add 0.56mL of pyrrole , after stirring evenly, aging at room temperature for three days, the color of the solution changes from brownish yellow to brownish black to obtain a polypyrrole / graphene mixed suspension; add ...

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Abstract

The invention provides a sulfur / polypyrrole / graphene / carbon nanotube composite film and a preparation method and an application thereof, and belongs to the technical field of chemical energy storage batteries. Polypyrrole in the film is grafted on reduced graphene oxide; the reduced graphene oxide and the functionalized carbon nanotubes are interwoven to form a three-dimensional carbon framework;and elemental sulfur is loaded in the three-dimensional carbon framework. According to the method, self-assembly is initiated by using an oxidation-reduction reaction between pyrrole and graphene oxide. Meanwhile, the functionalized multi-walled carbon nanotubes serve as a second carbon framework to provide an ion / electron rapid transmission channel, and a flexible self-supporting composite film is constructed through one-step vacuum filtration and post-sulfur loading. By using the strong adsorption of polypyrrole to polysulfide and the synergistic effect of the interwoven three-dimensional conductive framework constructed by graphene and carbon nanotubes, the problems of inherent non-conductivity of elemental sulfur, shuttle effect of polysulfide and the like can be solved, and the electrochemical performance of the lithium-sulfur battery is further improved.

Description

technical field [0001] The invention provides a sulfur / polypyrrole / graphene / carbon nanotube composite film, a preparation method and an application thereof, belonging to the technical field of chemical energy storage batteries. Background technique [0002] In order to alleviate environmental pollution and reduce dependence on fossil fuels, it is urgent to develop and utilize renewable alternative energy technologies. Secondary batteries represented by lithium-ion batteries are one of the most viable options for electrochemical energy storage devices. With the rapid development of related fields such as mobile electronic devices, electric vehicles and emerging wearable electrical technologies, the commercial batteries on the market can no longer meet the demand, and people have put forward higher requirements for the research and development of battery technology. Therefore, environmentally friendly secondary batteries with high volumetric energy density, high safety, long ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/38H01M4/624H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 苏岳锋姚金雨卢赟陈来包丽颖赵双义赵晨颖史宏娟陈实吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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