Abstract
The present study investigates the possibility to introduce the H2S capture process within the preparation of anode material for sodium ion batteries (SIBs). The H2S capture ability of SnO2/CNTs was firstly explored via a fixed-bed assisted sulfurization process: the SnO2/CNTs nanocomposite could be successfully used for the H2S removal. Meanwhile, the produced SnO2/SnS2/CNTs composite obtained after sulfurization process was directly used as active anode material for SIBs and showed enhanced electrochemical performance. Structural and compositional characterizations of the as-prepared materials were systematically investigated by XRD, SEM, TEM and TGA. Results reveal that the SnO2/CNTs composite have a comparable H2S capture ability respect to previously reported materials. Thanks to the plate-like structure of SnS2 coupled with SnO2 particles, the optimized SnO2/SnS2/CNTs material displayed an outstanding reversible specific capacity of 543 mAh g−1 under a current density of 50 mA g−1; this is much higher than the original SnO2/CNTs electrode. Further studies with electrochemical impedance spectroscopy revealed that the SnO2/SnS2/CNTs composite allowed for an enhanced sodium diffusion coefficient and increased charge transfer ability.
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