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
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[0032] Example 1
[0033] (1) Preparation of three-dimensional graphene oxide aerogel sulfur-supported (S / GO) composite material: Disperse 50 mg of graphene oxide and 50 mg of sublimed sulfur in 5 mL of distilled water, and add 0.5 mL of 10 mg mL at room temperature (25°C) -1 Chitosan (molecular weight: 150,000) / acetic acid aqueous solution (volume ratio of acetic acid to water is 5:95), stir until a hydrogel is formed, and then stand at room temperature for 6 hours, freeze-dry, to obtain three-dimensional graphite oxide Sulfur-loaded olefin aerogel (S / GO) composite material.
[0034] (2) Preparation of three-dimensional graphene aerogel sulfur-supported (S / rGO) composite material: 105 mg of the product obtained in step (1) was dispersed in 5 mL of distilled water, and 0.3 mL of ammonia (25 wt%) and 0.2mL hydrazine hydrate (50wt%) was reacted for 1.5 hours, filtered with suction and washed with distilled water until the filtrate was neutral, and the collected solids were freeze-dri...
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[0041] Example 2
[0042] (1) Preparation of three-dimensional graphene oxide aerogel sulfur-carrying (S / GO) composite: 25mg graphene oxide and 50mg sublimed sulfur were dispersed in 5mL distilled water, and 0.5mL 10mgmL was added at room temperature (25℃) -1 Chitosan (molecular weight: 150,000) / acetic acid aqueous solution (volume ratio of acetic acid to water is 5:95), stir until a hydrogel is formed, and then stand at room temperature for 6 hours, freeze-dry, to obtain three-dimensional graphite oxide Sulfur-loaded olefin aerogel (S / GO) composite material.
[0043] (2) Preparation of three-dimensional graphene aerogel sulfur-supported (S / rGO) composite material: 80 mg of the product obtained in step (1) was dispersed in 5 mL of distilled water, and 0.3 mL of ammonia (30 wt%) and 0.2mL hydrazine hydrate (40wt%) was reacted for 2 hours, filtered with suction and washed with distilled water until the filtrate was neutral, and the collected solids were freeze-dried to obtain the thr...
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[0045] Example 3
[0046] (1) Preparation of three-dimensional graphene oxide aerogel sulfur-carrying (S / GO) composite material: Disperse 50 mg of graphene oxide and 100 mg of sublimed sulfur in 5 mL of distilled water, and add 0.5 mL of 10 mg mL at room temperature (25°C) -1 Chitosan (molecular weight: 150,000) / acetic acid aqueous solution (volume ratio of acetic acid to water is 5:95), stir until a hydrogel is formed, and then stand at room temperature for 6 hours, freeze-dry, to obtain three-dimensional graphite oxide Sulfur-loaded olefin aerogel (S / GO) composite material.
[0047] (2) Preparation of three-dimensional graphene aerogel sulfur-supported (S / rGO) composite material: 155 mg of the product obtained in step (1) was dispersed in 10 mL of distilled water, and 0.3 mL of ammonia (15 wt%) and 0.2mL hydrazine hydrate (50wt%) was reacted for 1.2 hours, filtered with suction and washed with distilled water until the filtrate was neutral, and the collected solids were freeze-dr...
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