Metal-sulfur electrode for lithium-sulfur battery and preparing method thereof
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[0037]To prepare an anode with controlled directionality of a conductive material, 80% of sulfur (100 mesh, Aldrich), 10% of carbon nanotube (Hanwha Chemical) and 10% of a binder (PVdF, Kynar) were mixed in a solvent (NMP, Aldrich) and milled at 600 rpm for 12 hours using a planetary mill to prepare a slurry, which was coated on an aluminum electrode to about 50 μm thickness using a doctor blade and dried for 12 hours while applying an electric field using an electric field generator. The drying was performed slowly at room temperature under a strong electric field. Subsequently, the slurry was further dried in an oven at 50-80° C. to evaporate the remaining solvent. A unit cell was prepared by disposing a porous separator (Celgard 2325, Celgard) between the resulting anode with controlled directionality of the conductive material and a lithium cathode and coating an electrolyte [1M LiCF3SO3 / 0.5M LiTFSI+DME (1,2-dimethoxyethane, anhydrous, 99.5%), Aldrich] over the entire stru
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[0039]Battery performance of a lithium-sulfur battery using the metal electrode prepared in Example was compared with that of a lithium-sulfur battery using the existing metal electrode.
[0040]Tests were carried out for two conditions of the sulfur / conductive material / binder ratio of the anode at 6 / 2 / 2 and 8 / 1 / 1, with or without applying an electric field. The result is shown in Table 1.
TABLE 1CapacityInitialratioSam-Cath-ElectriccapacityCapacity(initial / pleAnodeodefield(cycle 1)(cycle 30)cycle 30)S1S / C / binderLiNone12128130.6707(6 / 2 / 2)S2S / C / binderLi30 kV / m,143011060.7734(6 / 2 / 2)100 Hz,10 hrS3S / C / binderLiNone12617900.627(8 / 1 / 1)S4S / C / binderLi30 kV / m,144311520.7983(8 / 1 / 1)100 Hz,10 hr
[0041]When the metal-sulfur electrode according to the present invention is used as the anode of the lithium-sulfur battery, it increases conductivity and reactivity of the electrode active material while maintaining directionality of the conductive m
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