Journal of Power Sources, Vol.331, 366-372, 2016
FeS2 nanocrystals prepared in hierarchical porous carbon for lithium-ion battery
FeS2 nanocrystals are successfully prepared in the carbon capsules of pre-prepared hierarchical porous carbon (HPC). The absorbed Fe ions in HPC are first calcined into Fe3O4 and then react with sulfur under vacuum conditions to synthesize FeS2. HPC, with micro-porous shells and inter-connected macro-porous carbon capsules, shows highly ionic/electrical conductivities and efficient buffer effect on the volume change of FeS2. FeS2@HPC exhibits a high specific capacity of 907 mAh.g(-1) in the first cycle and remains 720 mAh.g(-1) after 100 cycles at the rate of 1 C. (C) 2016 Elsevier B.V. All rights reserved.