1한국세라믹기술원 2한국세라믹기술원 3Bioenergy Crop Research Center 4고려대학교 5한국세라믹기술원
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.