Anode Performance of Herringbone-type Carbon Nanofiber in Lithium Ion Secondary Batteries

摘要

We have studied the effect of boron doping on the structural evolution of herringbone-type carbonnanofibers (HCNFs) as a function of heat-treatment temperature and then evaluated their anode performance compared to conventionally used graphite particles. It is confirmed that boron atoms acted as graphitization accelerator for HCNFs, possibly due to their high diffusivity. The nano-sized fibrous morphology including the high accessible surface area directly gave rise to a 3-5 fold increase in the anode performance capacity of nanofiber (e.g., rate capability) as compared with that of graphite particles. The substitutional boron atoms in carbon nanofibers contributed to the improved discharge capacity. The boron doped carbon nanofiber could be used as the promising anode material of lithium ion battery, where high rate capability is critically needed.