A kind of carbon-sulfur cathode material for lithium-sulfur battery and preparation method thereof
A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of cumbersome methods, time-consuming, low conductivity of sulfur, etc., and achieve simple preparation methods, excellent electrochemical performance, low sulfur content high effect
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Embodiment 1
[0033] (1) Preparation of sulfur-containing precursor solution: add 0.5 g of elemental sulfur powder to 2 mL of a solution of DMF and hydrazine hydrate at a volume ratio of 1:1 and react for 2 hours to obtain a uniform brown precursor solution;
[0034] (2) Preparation of hydrogen peroxide / sulfonated graphene aqueous solution: 100 mg of sulfonated graphene (sGO) was added to 150 mL of distilled water for ultrasonication for 2 h, and then 3 mL of hydrogen peroxide solution (mass concentration of 30 wt %) was added;
[0035] (3) Preparation of sGO / S composite material: under the condition of 15000r / min high-speed stirring, all the precursor solution obtained in (1) was added dropwise to the aqueous solution in (2) to prepare sGO / S-1:5 composite material, Finally, it was washed three times with distilled water and freeze-dried to obtain the final sample.
Embodiment 2
[0037] (1) Preparation of sulfur-containing precursor solution: add 0.5 g of elemental sulfur powder to 2 mL of a solution of DMF and hydrazine hydrate at a volume ratio of 1:1 and react for 2 hours to obtain a uniform brown precursor solution;
[0038] (2) Preparation of hydrogen peroxide / sulfonated graphene aqueous solution: 71 mg of sulfonated graphene was added to 150 mL of distilled water for ultrasonication for 2 h, and then 3 mL of hydrogen peroxide solution (30 wt %) was added;
[0039] (3) Preparation of sGO / S composite material: under the condition of 15000r / min high-speed stirring, all the precursor solution obtained in (1) was added dropwise to the aqueous solution in (2) to prepare sGO / S-1:7 composite material, Finally, it was washed three times with distilled water and freeze-dried to obtain the final sample.
[0040] figure 1 The SEM figure of the composite material of sGO / S-1:7 that is made in embodiment two, as can be seen from the figure, graphene wraps elemen...
Embodiment 3
[0042] (1) Preparation of sulfur-containing precursor solution: add 0.5 g of elemental sulfur powder to 2 mL of a solution of DMF and hydrazine hydrate at a volume ratio of 1:1 and react for 2 hours to obtain a uniform brown precursor solution;
[0043] (2) Preparation of hydrogen peroxide / sulfonated graphene aqueous solution: 50 mg of sulfonated graphene was added to 150 mL of distilled water for ultrasonication for 2 h, and then 3 mL of hydrogen peroxide solution (30 wt %) was added;
[0044] (3) Preparation of sGO / S composite material: under the condition of 15000r / min high-speed stirring, all the precursor solution obtained in (1) was added dropwise to the aqueous solution in (2) to prepare sGO / S-1:10 composite material, Finally, it was washed three times with distilled water and freeze-dried to obtain the final sample.
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