Enhanced cycling performance of Se-doped SnS carbon nanofibers as negative electrode for lithium-ion batteries

Se doping has recently demonstrated to be an powerful solution for enhancing the electrochemical performance due to the formation of Se-contained phase, which acts as a buffer matrix against strain and Sn agglomeration upon cycling. In this work, SnS0.9Se0.1 nanoparticles with sub-stoichiometric ratio of Se doping were encapsulated into carbon nanofibers by electrospinning technique. Compared with Se-free samples, Se-doped SnS0.9Se0.1@CNFs electrodes exhibit significantly improved cyclic stability and better rate capability. The degradation of specific capacity is 27% for the former while only 7% for the latter, i.e., 4 times improvement of the cycling stability. (C) 2016 Elsevier B.V. All rights reserved.