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        Giant-miscanthus-derived activated carbon and its application to lithium sulfur batteries

        임건해,채지수,채영록,강윤찬,노광철 한국탄소학회 2020 Carbon Letters Vol.30 No.5

        Giant miscanthus (GM) is an Asian grass that can produce biomass in high yields per land area. It can be used as a cathode material in lithium sulfur (Li/S) batteries. Giant-miscanthus-derived activated carbon (GMAC) is prepared via carboniza�tion of GM followed by KOH activation. It is prepared with a large amount of KOH, and thus contained more defects but had a highly porous structure and graphitic cluster lattice. GMAC has a large specifc surface area of 3327 m2 /g and a large total pore volume of 1.86 cm3 /g. The pore volume served as a storage space for the retention of polysulfdes, thereby inhibit�ing the shuttle efect. When a GMAC–sulfur composite cathode is tested in a Li/S battery, an initial discharge capacity of 1148 mAh/g can be attained at 0.1 C. In a cyclic charge–discharge experiment at 1 C, discharge capacities of 529 mAh/g and 248 mAh/g are observed in the frst and 200th cycles, respectively.

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