A kind of lithium-sulfur battery composite positive electrode material and preparation method thereof
A technology for composite positive electrode materials and lithium-sulfur batteries, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve problems such as not being able to meet the energy density of batteries, achieve rapid and efficient synthesis, and increase specific capacity.
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[0028] A method for preparing a lithium-sulfur battery composite positive electrode material provided by the invention, said method comprising the following steps:
[0029] 1) After cleaning the nano-inorganic metal oxide with acid and alkali and alcohol, mix it with elemental sulfur in a molar ratio, then put it into a vacuum container, and heat it in an oil bath to between 100°C and 200°C to melt the elemental sulfur , keeping the temperature for 1 to 5 hours, lowering the temperature and cooling to prepare a composite of nano-inorganic metal oxide and monosulfur, and then crushing the composite in an alcohol solvent;
[0030] 2) Mix the crushed nano inorganic metal oxide and sulfur compound with commercially available graphene carbon nanotube hybrids, put them in a vacuum container, and heat them for 1 to 5 hours at 100°C to 200°C. Melting treatment, under the protection of nitrogen or argon atmosphere, cooling and stirring and grinding treatment;
[0031] 3) Add the groun...
Embodiment 1
[0035] 1. Preparation of composite cathode material: according to the composite composition form C set at the beginning of the experiment 0.05 S 0.684 m 0.076 G 0.19 For production, graphite microflakes, elemental sulfur, and nano-alpha-Al 2 o 3 The powder and the graphene carbon nanotube hybrid were weighed out respectively. 1) Utilize commercially available 3D columnar structure 10um graphene carbon nanotube hybrids; 2) Incorporate 200nm inorganic metal oxide α-Al 2 o 3 The powder is cleaned with sulfuric acid, then cleaned to be neutral, soaked in ethanol for 1 hour and then dried; 3) the weighed nanometer α-Al 2 o 3 Mix the powder and elemental sulfur well, then put the mixture into a vacuum container, heat the oil bath to 120°C to melt the elemental sulfur, keep the temperature for 5 hours and completely cover the surface of the inorganic material; oxidize the nano-inorganic metal The mixture of compound and sulfur was cooled to room temperature, and the mixture w...
Embodiment 2
[0039] 1. Preparation of cathode material: according to the composite composition form C set at the beginning of the experiment 0.05 S 0.722 m 0.038 G 0.19 For production, graphene oxide, elemental sulfur, nano-α-Al 2 o 3 The powder and the graphene carbon nanotube hybrid were weighed out respectively. 1) Utilize commercially available 1um graphene carbon nanotube hybrid; 2) Incorporate 100nm inorganic metal oxide α-Al 2 o 3 The powder is washed with sulfuric acid, then cleaned to be neutral, soaked in ethanol for 1 hour and then dried; 3) the weighed nano-inorganic metal oxide α-Al 2 o 3 Mix the powder and elemental sulfur well, then put the mixture into a vacuum container, heat the oil bath to 120°C to melt the elemental sulfur, keep the temperature and completely cover the surface of the inorganic material; put the nano-inorganic metal oxide and The sulfur mixture was cooled to room temperature, and the mixture was triturated in ethanol solvent. 4) Add the weighed ...
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