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A modified graphene airgel loaded with sulfur and its preparation method and application

A graphene aerogel, modified technology, applied in electrical components, structural parts, battery electrodes, etc., can solve problems such as poor electrical performance of lithium-sulfur batteries

Active Publication Date: 2019-07-19
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a sulfur-loaded modified graphene airgel and its preparation method and application, which solves the problem of poor electrical performance of lithium-sulfur batteries made of sulfur-carbon composite materials in the prior art. technical problem

Method used

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  • A modified graphene airgel loaded with sulfur and its preparation method and application
  • A modified graphene airgel loaded with sulfur and its preparation method and application
  • A modified graphene airgel loaded with sulfur and its preparation method and application

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Embodiment 1

[0029] The modified graphene airgel of the present embodiment loaded with sulfur and its preparation method are as follows:

[0030] S1. Add pyrrole monomer to thiophene monomer in a molar ratio of 1:100 into deionized water, use oxalic acid to adjust the pH value of the solution to 6.0, and configure polymer monomer solution A after dispersing for 1 hour;

[0031] S2. Add graphene oxide into deionized water at a concentration of 10g / L, add a dispersant polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer with a mass of 0.1% of graphene oxide, and disperse at a high speed for 30 minutes to configure Graphene oxide solution B;

[0032] S3. Add solution A dropwise to solution B, stir, keep the temperature of the reaction solution at 55°C, and the reaction time is 2h, to obtain the dispersion solution C of graphene oxide-nitrogen-containing polymer-polythiophene composite material, In the control solution C, the molar mass ratio of thiophene monomer an...

Embodiment 2

[0036] The modified graphene airgel of the present embodiment loaded with sulfur and its preparation method are as follows:

[0037] S1. Add the molar ratio of aniline monomer to thiophene monomer to 10:100 into deionized water, add boric acid with a molar ratio of aniline monomer of 2%, use citric acid to adjust the pH of the solution to 6.2, and disperse at a high speed for 1.5h to form a polymerization Object monomer solution A;

[0038] S2. Add graphene oxide into deionized water at a concentration of 15g / L, add a dispersant ethylene oxide-butylene oxide copolymer with a mass of 0.2% of graphene oxide, and disperse at a high speed for 1 hour to prepare graphene oxide solution B;

[0039] S3. Add solution A dropwise to solution B, turn on the high-speed stirring mode, keep the temperature of the reaction solution at 60°C, and the reaction time is 4h, and the graphene oxide-boron-doped nitrogen-containing polymer-polythiophene composite material can be obtained The disperse...

Embodiment 3

[0043] The modified graphene airgel of the present embodiment loaded with sulfur and its preparation method are as follows:

[0044] S1. Add p-phenylenediamine monomer to thiophene monomer molar ratio 20:100 into deionized water, add boric acid with 4% p-phenylenediamine monomer molar ratio, use acetic acid to adjust the pH value of the solution to 6.4, and disperse at high speed 2h is configured into polymer monomer solution A;

[0045] S2. Add graphene oxide into deionized water at a concentration of 20g / L, add a dispersant polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer with a mass of graphene oxide of 0.3%, and high-speed Disperse for 1.5h to configure graphene oxide solution B;

[0046] S3. Add solution A dropwise to solution B, turn on the high-speed stirring mode, keep the temperature of the reaction solution at 65°C, and the reaction time is 3 hours, and the graphene oxide-boron-doped nitrogen-containing polymer-polythiophene composite mat...

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Abstract

The invention provides a sulfur-loaded modified graphene aerogel and a preparation method and application thereof, and relates to the technical field of battery materials. The sulfur-loaded modified graphene aerogel comprises nitrogenous macromolecular monomers, thiophene monomers, boric acid, graphene oxide, a dispersing agent and dithiothreitol. The advantages of large specific surface area and high conductivity of a graphene aerogel are utilized, a sulfur source is controlled to attach to the surface of the graphene oxide in a form of polythiophene, and the formed elemental sulfur can be uniformly dispersed in a conductive network established by the graphene aerogel, so that loading is stable, dissolving-out of the elemental sulfur during cycling is reduced, the swelling problem of an anode of a lithium sulfur battery is solved, and cycling performance of the lithium sulfur battery can be improved further.

Description

technical field [0001] The invention relates to the technical field of battery materials, and relates to a sulfur-loaded modified graphene aerogel and a preparation method and application thereof. Background technique [0002] Lithium-sulfur batteries, as a new generation of lithium-ion batteries favored by the industry and academia, are gradually favored by all parties. Since elemental sulfur has a theoretical specific capacity of 1675mAh / g, its theoretical energy density can reach 2600wh / kg, which is currently the commercial lithium-ion battery. The energy density of batteries (NCM ternary batteries, lithium cobalt oxide batteries, etc.) is nearly 10 times; at the same time, elemental sulfur has the advantages of abundant reserves, low price, and environmental friendliness, so lithium-sulfur batteries become the most attractive in the future battery system one of the systems. [0003] However, there are many problems in the practical application of lithium-sulfur batterie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/364H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 汪涛
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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