Submicrospherical and Porous Bi 2 S 3 Protected by Nitrogen‐Doped Carbon for Practical Anode Fabrication of Li‐Ion Batteries

Research on alloy‐type anode materials with micro/submicrospherical morphology is of great significance for the development of high energy‐density Li‐ion batteries. A facile and cost‐effective route is adopted to prepare homogeneous submicrospherical and porous Bi 2 S 3 @nitrogen‐doped carbon (NC) nanocomposites, which exhibit considerably better Li‐storage performance than pure Bi 2 S 3 and Bi 2 O 3 submicrospheres. Analyses on the electrochemical behavior and morphology of the electrode show that the good performance of Bi 2 S 3 @NC can be correlated with its stable submicrospherical structure and decreased charge‐transfer resistance, for which the NC coating layer and porous interior of Bi 2 S 3 are supposed to be the two main contributors. The submicrospherical structure and facile synthesis of Bi 2 S 3 @NC will be very suitable for practical electrode fabrication technology of Li‐ion batteries.