Battery positive electrode, preparation method thereof and application in lithium-sulfur battery
A battery cathode and cathode active material technology, applied in battery electrodes, electrode carriers/collectors, non-aqueous electrolyte battery electrodes, etc., can solve the problem that the utilization rate of active materials and battery cycle characteristics cannot meet commercial applications and limit the size of lithium-sulfur batteries. Large-scale application and other issues, to achieve the effect of high active material sulfur utilization rate, excellent cycle performance, and high conductivity
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Embodiment 1
[0040] Put 20 parts by mass of expanded graphite (obtained by treating expandable graphite in a tube furnace under air atmosphere at 800°C for 10 seconds, the same below) into a beaker filled with 100 mL of deionized water, and ultrasonically for 5 hours to obtain carbon Base material dispersion; mix and disperse 80 parts by mass of sulfur and 80 parts by mass of sodium sulfide in 100 mL of deionized water, add 10 mL of 1% surfactant TX100 to obtain a yellow polysulfide dispersion; Slowly add the yellow polysulfide dispersion into the expanded graphite dispersion, sonicate for 1 h, then add 10 mL of concentrated hydrochloric acid (commercially available concentrated hydrochloric acid), and magnetically stir for 1 h at room temperature to obtain the expanded graphite-polysulfide mixture; In the process, the expanded graphite-polysulfide mixture was stirred in a water bath at 70°C for 1 hour, then vacuum filtered, dried in a vacuum oven at 60°C, and then heat-treated in a vacuum ...
Embodiment 2
[0044] Put 25 parts by mass of expanded graphite into a beaker filled with 100 mL of deionized water, and ultrasonicate for 5 hours to obtain a carbon-based material dispersion; mix and disperse 75 parts by mass of sulfur and 75 parts by mass of sodium sulfide in 100 mL of deionized water, Add 10mL of 1% surfactant TX100 to obtain a yellow polysulfide dispersion; under ultrasonication, slowly add the yellow polysulfide dispersion into the expanded graphite dispersion, ultrasonicate for 1h, then add 10mL of concentrated hydrochloric acid, Stir magnetically for 1 hour to obtain the expanded graphite-polysulfide mixture; in a fume hood, stir the expanded graphite-polysulfide mixture in a water bath at 70°C for 1 hour, then vacuum filter, dry in a vacuum oven at 60°C, and then Heat treatment in a vacuum oven at 155° C. for 2 hours to obtain an expanded graphite-sulfur composite material.
[0045] The same procedure as described in Example 1 was followed to prepare the positive ele...
Embodiment 3
[0047] Put 33 parts by mass of expanded graphite into a beaker filled with 100 mL of deionized water, and ultrasonicate for 5 hours to obtain a carbon-based material dispersion; mix and disperse 66 parts by mass of sulfur and 66 parts by mass of sodium sulfide in 100 mL of deionized water, Add 10mL of 1% surfactant TX100 to obtain a yellow polysulfide dispersion; under ultrasonication, slowly add the yellow polysulfide dispersion into the expanded graphite dispersion, ultrasonicate for 1h, then add 10mL of concentrated hydrochloric acid, Stir magnetically for 1 hour to obtain the expanded graphite-polysulfide mixture; in a fume hood, stir the expanded graphite-polysulfide mixture in a water bath at 70°C for 1 hour, then vacuum filter, dry in a vacuum oven at 60°C, and then Heat treatment in a vacuum oven at 155° C. for 2 hours to obtain an expanded graphite-sulfur composite material.
[0048] The same procedure as described in Example 1 was followed to prepare the positive ele...
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Abstract
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