Abstract
Alloying-type metal sulfides with high sodiation activity and theoretical capacity are promising anode materials for high energy density sodium ion batteries. However, the large volume change and the migratory and aggregation behavior of metal atoms will cause severe capacity decay during the charge/discharge process. Herein, a robust and conductive TiS2 framework is integrated with a high-capacity SbS layer to construct a single phase (SbS)1.15TiS2 superlattice for both high-capacity and fast Na+ storage. The metallic TiS2 sublayer with high electron activity acts as a robust and conductive skeleton to buffer the volume expansion caused by conversion and alloying reaction between Na+ and SbS sublayer. Hence, high capacity and high rate capability can be synergistically realized in a single phase (SbS)1.15TiS2 superlattice. The novel (SbS)1.15TiS2 anode has a high charge capacity of 618 mAh g−1 at 0.2 C and superior rate performance and cycling stability (205 mAh g−1 at 35 C after 2,000 cycles). Furthermore, in situ and ex situ characterizations are applied to get an insight into the multi-step reaction mechanism. The integrity of robust Na-Ti-S skeleton during (dis)charge process can be confirmed. This superlattice construction idea to integrate the Na+-active unit and electron-active unit would provide a new avenue for exploring high-performance anode materials for advanced sodium-ion batteries.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (2019YFA0210600) and the National Natural Science Foundation of China (51922103 and 51972326).
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Unlocking Efficient Energy Storage via Regulating Ion and Electron-Active Subunits: An (SbS)1.15TiS2 Superlattice for Large and Fast Na+ Storage
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Peng, B., Cai, T., Zhang, S. et al. Unlocking efficient energy storage via regulating ion and electron-active subunits: an (SbS)1.15TiS2 superlattice for large and fast Na+ storage. Sci. China Chem. 67, 336–342 (2024). https://doi.org/10.1007/s11426-023-1699-x
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DOI: https://doi.org/10.1007/s11426-023-1699-x