Sulfide-carbon in-situ composite material, electrode, preparation method thereof and battery
An in-situ composite material and in-situ composite technology, which is applied in the field of sulfide-carbon in-situ composite materials, electrodes and their preparation, can solve the problems of mechanical ball milling that is difficult to combine the micro-scale of sulfide and carbon carrier, and achieve improved Charge-discharge cycle performance, overcoming the low conductivity of the product, and the effect of broad application prospects
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[0033] The present invention provides above-mentioned sulfide-carbon in situ composite material preparation method, it comprises the following steps:
[0034] 1) Dissolving the sulfide precursor in an alcoholic solvent to obtain a solution with a concentration of 10% to 20%.
[0035] The sulfide is one of magnesium sulfide and lithium sulfide.
[0036] The sulfide precursor is one of magnesium thiocyanate and lithium thiocyanate. They are easily soluble in alcohol. Because ethanol has low toxicity and suitable boiling point, ethanol is preferably recommended.
[0037] Magnesium thiocyanate and lithium thiocyanate usually contain water of crystallization, and alcoholic solvents also often contain a small amount of water. It is recommended to add granular calcium oxide to the solvent to remove water, and then filter to remove the solid phase to obtain the sulfide precursor Anhydrous solution. The purpose of removing moisture is to prevent magnesium thiocyanate and lithium thi...
Embodiment 1
[0089] 1) Weigh 10 grams of magnesium thiocyanate and 90 grams of anhydrous methanol, stir until completely dissolved, and obtain a solution with a concentration of 10%.
[0090] 2) Weigh 15 grams of polystyrene powder and 85 grams of xylene, and stir until completely dissolved to obtain a solution with a concentration of 10%.
[0091] 3) The two solutions are mixed and stirred to obtain a mixed solution.
[0092] 4) Heat the mixed solution while stirring to evaporate the solvent to nearly dryness, then move the material into a crucible and put it into a vacuum oven, and heat it to 120°C after vacuuming until the solvent is completely evaporated to obtain a solid phase mixture.
[0093]5) Put the obtained solid-phase mixture and the crucible into a muffle furnace, heat to 600°C under the protection of high-purity nitrogen or argon, keep the temperature at a constant temperature for 4 hours, and after cooling to room temperature, take out the crucible, and grind the product to ...
Embodiment 2
[0095] 1) Weigh 20 grams of lithium thiocyanate and 80 grams of absolute ethanol, and stir until completely dissolved to obtain a solution with a concentration of 20%.
[0096] 2) Weigh 20 grams of polystyrene powder and 80 grams of toluene, stir until completely dissolved, and obtain a solution with a concentration of 20%.
[0097] 3) The two solutions are mixed and stirred to obtain a mixed solution.
[0098] 4) Heat the mixed solution while stirring to evaporate the solvent to nearly dryness, then move the material into a crucible and put it into a vacuum oven, and heat it to 100°C after vacuuming until the solvent is completely evaporated to obtain a solid phase mixture.
[0099] 5) Put the obtained solid-phase mixture and the crucible into a muffle furnace, heat to 450°C under the protection of high-purity nitrogen or argon, keep the temperature at a constant temperature for 6 hours, and after cooling to room temperature, take out the crucible, and grind the product to ob...
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