Co9S8 nanoparticles embedded into amorphous carbon as anode materials for lithium ion batteries

In this paper, Co9S8 nanoparticles embedded into amorphous carbon have been synthesized by a simple electrospinning method followed by a high-temperature annealing process. The unique structure endows the Co9S8/C composites with excellent electrochemical properties. Co9S8 particles embedded into the carbon matrix show a high Li storage capacity around 1100 and 358 mAhg(-1) at a current density of 0.1 and 5.0 Ag(-1), respectively. After 200 cycles, an impressive discharge capacity of around 1063.4 mAhg(-1) can be obtained at a current density of 0.3 Ag(-1).