Abstract
Corn-derived biocarbon (CDB) is prepared by the carbonization of corn lignocellulosic waste at 500 °C in air atmosphere, without (CDB-1) and with (CDB-2) the presence of eutectic LiCl-KCl molten salt. CDB-2 is found to be superior to CDB-1 in terms of specific surface area, pore volume and elemental carbon purity. The enhanced porosity, and the partial dissolution of the biomass impurities into the molten salt contribute to the greater Li-ion storage performance of CDB-2 in comparison to that of CDB-1; 302.8 vs 216.3 mAh/g after 200 discharge/charge cycles at the current density of 200 mA/g. After 625 cycles, the capacity of CDB-2 is evaluated to be remarkable at 380.0 mAh/g, considerably greater than that of commercial graphite anodes. The results obtained show the highly positive influence of molten salts on enhancing the physical and electrochemical properties of the biomass-derived carbon materials.
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