Freestanding SnS Carbon Composite Nanofiber Material with Excellent Electrochemical Performance as Binder‐Free Negative Electrode for Lithium‐ion Batteries.

Metal sulfide demonstrated sluggish ionic transport kinetics due to the low electronic conductively, resulting larger volume expansion and even pulverize electrode during Li+ insertion/deinsertion. In this study, freestanding SnS nanoflower@carbon nanofiber (SnS@CNF) was prepared by the sol‐gel electrospinning of hydrothermal synthesized SnS2 nanoflower and carbonization. When direct used SnS@CNF as a binder‐free negative electrode for LIB, it delivered specific capacity of 564.4 mAh g−1@0.3 C after 450 cycles, and high rate capacities of 595, 465, 354, 267, 200, 129, 74, and 484 mAh g−1 at the current densities of 0.064, 0.1, 0.3, 0.6, 1.0, 1.5, 2.0, and 0.1 mA g−1, respectively. Such excellent electrochemical performance is attributed to the nanostructured conductive CNF network not only can buffer volume expansion and prevents the aggregation of active material, but also improve Li+ migration rates during the discharge (4.47×10−7 cm2 s−1) and charge (2.73×10−6 cm2 s−1) process. [ABSTRACT FROM AUTHOR]