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Three-dimensional graphite aerogel sulfur-carrying composite material as well as preparation method and application thereof

A technology of graphene airgel and composite materials, which is applied in the field of electrode materials for lithium-sulfur batteries, can solve problems such as poor cycle performance and rate performance, unsatisfactory material conductivity, complicated preparation process, etc., and achieve convenient large-scale production , improve cycle stability and rate performance, and alleviate the effect of volume change

Active Publication Date: 2017-06-09
NANJING NORMAL UNIVERSITY
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Problems solved by technology

[0005] However, there are still some defects in the current related technology, such as complex preparation process, high energy consumption in the heating process, and sulfur volatilization, resulting in waste of raw materials and low conversion efficiency; in addition, the electrical conductivity of the obtained material is not ideal, and the cycle performance and rate performance are poor. Wait

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  • Three-dimensional graphite aerogel sulfur-carrying composite material as well as preparation method and application thereof
  • Three-dimensional graphite aerogel sulfur-carrying composite material as well as preparation method and application thereof
  • Three-dimensional graphite aerogel sulfur-carrying composite material as well as preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0033] (1) Preparation of three-dimensional graphene oxide airgel sulfur-loaded (S / GO) composites: Disperse 50 mg of graphene oxide and 50 mg of sublimed sulfur in 5 mL of distilled water, add 0.5 mL of 10 mg mL at room temperature (25 °C) -1 Chitosan (molecular weight is 150,000) / acetic acid aqueous solution (volume ratio of acetic acid to water is 5:95), stirred until hydrogel is formed, then left to stand at room temperature for 6 hours, and freeze-dried to obtain three-dimensional graphite oxide Sulfur-loaded (S / GO) composites on olefin airgel.

[0034] (2) Preparation of three-dimensional graphene airgel sulfur-loaded (S / rGO) composite material: disperse 105 mg of the product obtained in step (1) with 5 mL of distilled water, add 0.3 mL of ammonia (25 wt %) and 0.2mL hydrazine hydrate (50wt%) was reacted for 1.5 hours, suction filtered and washed with distilled water until the filtrate was neutral, and the collected solid was freeze-dried to obtain the three-dimensional g...

Embodiment 2

[0042] (1) Preparation of three-dimensional graphene oxide airgel sulfur-loaded (S / GO) composites: Disperse 25 mg of graphene oxide and 50 mg of sublimed sulfur in 5 mL of distilled water, add 0.5 mL of 10 mg mL at room temperature (25 °C) -1 Chitosan (molecular weight is 150,000) / acetic acid aqueous solution (volume ratio of acetic acid to water is 5:95), stirred until hydrogel is formed, then left to stand at room temperature for 6 hours, and freeze-dried to obtain three-dimensional graphite oxide Sulfur-loaded (S / GO) composites on olefin airgel.

[0043] (2) Preparation of three-dimensional graphene airgel sulfur-loaded (S / rGO) composite material: disperse 80 mg of the product obtained in step (1) with 5 mL of distilled water, add 0.3 mL of ammonia (30 wt %) and 0.2mL hydrazine hydrate (40wt%) was reacted for 2 hours, suction filtered and washed with distilled water until the filtrate was neutral, and the collected solid was freeze-dried to obtain the three-dimensional grap...

Embodiment 3

[0046] (1) Preparation of three-dimensional graphene oxide airgel sulfur-loaded (S / GO) composites: Disperse 50 mg of graphene oxide and 100 mg of sublimed sulfur in 5 mL of distilled water, add 0.5 mL of 10 mg mL at room temperature (25 °C) -1 Chitosan (molecular weight is 150,000) / acetic acid aqueous solution (volume ratio of acetic acid to water is 5:95), stirred until hydrogel is formed, then left to stand at room temperature for 6 hours, and freeze-dried to obtain three-dimensional graphite oxide Sulfur-loaded (S / GO) composites on olefin airgel.

[0047] (2) Preparation of three-dimensional graphene airgel sulfur-loaded (S / rGO) composite material: disperse 155 mg of the product obtained in step (1) with 10 mL of distilled water, add 0.3 mL of ammonia (15 wt %) and 0.2mL hydrazine hydrate (50wt%) was reacted for 1.2 hours, suction filtered and washed with distilled water until the filtrate was neutral, and the collected solid was freeze-dried to obtain the three-dimensional...

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Abstract

The invention discloses a three-dimensional graphite aerogel sulfur-carrying composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: forming an aerogel precursor from sulfur and oxidized graphene, and performing reduction by using hydrazine hydrate, thereby obtaining a graphene wrapped sulfur- composite material of three-dimensional network structures of which the interiors are communicated with one another. Compared with the prior art, the composite material disclosed by the invention can be used as an anode material of a lithium-sulfur battery, and has preponderant circulation stability and high rate capability.

Description

technical field [0001] The invention discloses a three-dimensional graphene airgel sulfur-carrying composite material, a preparation method and application thereof, and belongs to the technical field of electrode materials for lithium-sulfur batteries. Background technique [0002] Energy and environmental issues are two major problems that human beings need to solve urgently. Today, with the depletion of fossil energy, increasingly serious environmental pollution, and global warming, it is particularly urgent to seek renewable green energy to replace traditional fossil energy and to seek harmony between man and the environment. The utilization of new renewable energy, such as wind energy and solar energy, the gradual marketization of electric vehicles and hybrid electric vehicles, and the rapid development of various portable electrical devices all require efficient, practical, "green" (zero pollution or low pollution) energy storage system. Chemical energy storage occupi...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/38H01M4/36H01M4/62
CPCH01M4/362H01M4/366H01M4/38H01M4/587H01M4/625Y02E60/10
Inventor 周益明薛曼利杜进彩姜莉吴平
Owner NANJING NORMAL UNIVERSITY
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