A kind of positive electrode material of lithium-sulfur battery and preparation method thereof
A positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of insufficient carbon-sulfur force, large elemental sulfur particles, and insufficient force, and achieve good rate performance and The effect of cycle performance
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Embodiment 1
[0034] (1) Preparation of sulfur-containing reducing precursor solution (HH / S): add 0.6g of elemental sulfur to the mixed liquid of 1.2ml of hydrazine hydrate and 1.2ml of DMF, stir magnetically for 5min to obtain a brown transparent solution;
[0035] (2) Preparation of graphene oxide with different degrees of reduction: Put graphene oxide (GO) into a tube furnace at a heating rate of 10°C / min and treat it under a nitrogen atmosphere at 200°C for 1h to obtain partially reduced graphite oxide alkene;
[0036] (3) Preparation of graphene oxide aqueous solutions with different reduction degrees: adding 0.2 g of rGO obtained in step (2) into 100 ml of distilled water for ultrasonic treatment for 2 h;
[0037] (4) Preparation of elemental sulfur / graphene composite (S / rGO): Add the HH / S obtained in step (1) to the rGO aqueous solution obtained in step (3), stir magnetically for 24 h, centrifuge to obtain the final sample, and use Washed three times with distilled water and freeze-...
Embodiment 2
[0040] (1) Preparation of sulfur-containing reducing precursor solution (HH / S): Add 0.6g of elemental sulfur to the mixed liquid of 1.2ml of hydrazine hydrate and 1.2ml of DMF, stir magnetically for 5min to obtain a brown transparent solution;
[0041] (2) Preparation of graphene oxide with different degrees of reduction: Put graphene oxide (GO) into a tube furnace at a heating rate of 10°C / min and treat it under nitrogen atmosphere at 500°C for 1h;
[0042] (3) Preparation of graphene oxide aqueous solutions with different reduction degrees: adding 0.2 g of rGO obtained in step (2) into 100 ml of distilled water for ultrasonic treatment for 2 h;
[0043] (4) Preparation of elemental sulfur / graphene composite (S / rGO): Add the HH / S obtained in step (1) to the rGO aqueous solution obtained in step (3), stir magnetically for 24 h, centrifuge to obtain the final sample, and use Washed with distilled water three times, and finally freeze-dried to obtain S / rGO-500.
Embodiment 3
[0045] (1) Preparation of sulfur-containing reducing precursor solution (HH / S): Add 0.6g of elemental sulfur to the mixed liquid of 1.2ml of hydrazine hydrate and 1.2ml of DMF, stir magnetically for 5min to obtain a brown transparent solution;
[0046] (2) Preparation of graphene oxide (rGO) with different degrees of reduction: put graphene oxide (GO) into a tube furnace at a heating rate of 10 °C / min and treat it under nitrogen atmosphere at 1000 °C for 1 h;
[0047] (3) Preparation of graphene oxide aqueous solutions with different reduction degrees: adding 0.2 g of rGO obtained in step (2) into 100 ml of distilled water for ultrasonic treatment for 2 h;
[0048] (4) Preparation of elemental sulfur / graphene composite (S / rGO): Add the HH / S obtained in step (1) to the rGO aqueous solution obtained in step (3), stir magnetically for 24 h, centrifuge to obtain the final sample, and use Washed with distilled water three times, and finally freeze-dried to obtain S / rGO-1000.
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