Effect of Pyrolysis Method on Physical Properties of Activated Biochar and its Application as Cathode Material for Lithium-Sulfur Battery

摘要

The influence ofpreparation method on the specific surface area, total pore volume, and pore size distribution of activated biochar derivedfrom canola meal and Douglas fir was investigatedfor its use as cathode material for a lithium-sulfur (Li-S) battery. The specific surface area and total pore volume of fast pyrolysis derived activated biochars from Douglas fir and canola meal were found to be 3355 and 3227 m2 g'1, and 1.58 and 1.49 cm3 g'1, respectively. Fast pyrolysis of canola meal activated biochar that was loaded with 66.2% sulfur and exhibited high initial capacity of 1222 mAh g'1 at low discharge rate (0.05 C) and high capacity retention of589 mAh g~! after 100 cycles at high discharge rate (0.5 C) when used as the cathode for a Li-S battery. Our results indicated that activated biochar derivedfrom fast pyrolysis showed better physical properties for use as Li-S cathode material as compared to activated biochar derivedfrom slow pyrolysis.