Hierarchical carbon microstructures prepared from oil-palm-shell tracheids for Li-S batteries
Hierarchical porous hollow carbon microstructure (HPHCM) has been successfully prepared from a cheap and abundant nature resource of oil palm shells, which is a well-known host material of sulfur electrode in Li-S batteries. In the preparation, the hollow tracheids are chemically isolated from oil palm shells, further heat-treated at 400 °C for carbonization and then calcined at 800 °C with KOH/K2CO3 for activation. In Li-S batteries, as-prepared HPHCMs are loaded with 60 wt.% sulfur to form the cathode materials, which delivers an initial specific capacity of 1105 mAh g-1 and a high capacity retention of 74% even after 100 cycles. Thus, this investigation provides a facile method of preparing hierarchical porous hollow carbon microstructures from plant tracheids, which can be applied as electrode materials excellently.