Improving the performance of a SnS2 cathode with interspace layer engineering using a Na+ insertion/extraction method for aqueous zinc ion batteries
Literature Information
Nima Mikaeili Chahartagh, Shahriar Namvar, Mahshid Ershadi, Ehsan Delfani
Layered materials are promising as cathodes for aqueous zinc-ion batteries (AZIBs) due to the reduced complexity of 2D Zn2+ transport channels. Nevertheless, their weak cycle stability or limited capacity restricts their practical usage. We attempted to evolve a SnS2 cathode synthesized by a simple hydrothermal procedure for 0.86 nm-spaced ZIBs for the first time. We precisely monitored the Na ion insertion and extraction in a layered structure of SnS2 dominated by van der Waals interactions, leading to considerably high interspace layers SnS2 (SnS2-HIL) from 0.86 to 1.10 nm. It enables higher Zn2+ storage capacity in SnS2-HIL cathodes. The SnS2-HIL has an exceptionally high-rate performance and stable cycling over time, with 359 mA h g−1 at 0.1 A g−1 and 174 mA h g−1 at 10 A g−1, along with 83.7% of capacity maintained after 1000 cycles. Electrochemical investigations indicated improved Zn2+ migration kinetics and excellent pseudocapacitive behaviors. An ex situ study showed that a reversible phase change between Sn2+ and Sn4+ occurred after an energy-storing mechanism brought about by Zn ion insertion/extraction. This study opens up an exciting new opportunity for developing and optimizing 2D materials as high-performance cathodes for AZIBs.
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methanone structure [4-(Hydroxymethyl)phenyl](phenyl)methanone structure](https://static.chemtradehub.com/structs/814/81449-01-6-786d.webp)
