Lithium-sulfur battery composite positive electrode material and preparation method thereof
A composite cathode material, lithium-sulfur battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of weak adsorption, inability to effectively inhibit the dissolution of lithium polysulfides, limited action sites, etc. The method is simple, Simple process and mature technology
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Embodiment 1
[0024] A composite cathode material for a lithium-sulfur battery, specifically prepared according to the following steps:
[0025] Magnesium ferrite (MgFe 2 o 4 ) preparation:
[0026] Add 2.5 mmol of magnesium acetate tetrahydrate and 5 mmol of ferric nitrate nonahydrate to a mixed solvent consisting of 5 mL of deionized water and 5 mL of absolute ethanol, and stir until the added compound is completely dissolved; then weigh 5 g of Add polyvinylpyrrolidone into the above solution, stir until it is completely dissolved, and obtain a polymer viscous fluid; then heat and stir at 80°C until the solvent is completely evaporated, and grind to obtain a powder precursor; finally, put the powder precursor into a porcelain ark, and then Calcined in a muffle furnace at 500 °C for 5 h, with a heating rate of 2 o C / min, and finally cooled to room temperature to obtain magnesium ferrite;
[0027] The magnesium ferrite obtained above is compounded with sulfur element:
[0028] Weigh 50...
Embodiment 2
[0032] A composite cathode material for a lithium-sulfur battery, specifically prepared according to the following steps:
[0033] Zinc ferrite (ZnFe 2 o 4 ) preparation:
[0034] Add 2.5 mmol of zinc acetate dihydrate and 5 mmol of ferric nitrate nonahydrate to a mixed solvent consisting of 5 mL of deionized water and 5 mL of absolute ethanol, and stir until the added compound is completely dissolved; then weigh 5 g of Add polyvinylpyrrolidone into the above solution, stir until it is completely dissolved, and obtain a polymer viscous fluid; then heat and stir at 80°C until the solvent is completely evaporated, and grind to obtain a powder precursor; finally, put the powder precursor into a porcelain ark, and then Calcined in a muffle furnace at 600 °C for 5 h, with a heating rate of 2 o C / min, and finally cooled to room temperature to obtain zinc ferrite;
[0035] Combination of zinc ferrite and sulfur element:
[0036] Weigh 50 mg of zinc ferrite and ultrasonically dis...
Embodiment 3
[0039] A composite cathode material for a lithium-sulfur battery, specifically prepared according to the following steps:
[0040] Copper ferrite (CuFe 2 o 4 ) preparation:
[0041] Add 2.5 mmol of copper acetate monohydrate and 5 mmol of ferric nitrate nonahydrate to a mixed solvent consisting of 5 mL of deionized water and 5 mL of absolute ethanol, and stir until the added compound is completely dissolved; then weigh 5 g of Add polyvinylpyrrolidone into the above solution, stir until it is completely dissolved, and obtain a polymer viscous fluid; then heat and stir at 80°C until the solvent is completely evaporated, and grind to obtain a powder precursor; finally, put the powder precursor into a porcelain ark, and then Calcined in a muffle furnace at 500 °C for 5 h, with a heating rate of 2 o C / min, and finally cooled to room temperature to obtain copper ferrite;
[0042] Composite the obtained copper ferrite with sulfur element:
[0043] Weigh 50 mg of copper ferrite a...
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