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Lin, C., Qi, F., Dong, H., Li, X., Shen, C., Ang, E. H., Han, Y., Geng, H., & Li, C. C. (2021). Suppressing vanadium dissolution of V2O5via in situ polyethylene glycol intercalation towards ultralong lifetime room/low-temperature zinc-ion batteries. Nanoscale, 13(40), 17040-17048. https://doi.org/10.1039/d1nr05334e
Zinc-ion batteries (ZIBs) are a main focus worldwide for their potential use in large-scale energy storage due to their abundant resources, environmental friendliness, and high safety. However, the cathode materials of ZIBs are limited, requiring a stable host structure and fast Zn2+ channel diffusion. Here, we develop a strategy for the intercalation of polyethylene glycol (PEG) to facilitate Zn2+ intercalation and to suppress the dissolution of vanadium in V2O5. In particular, PEG-V2O5 shows a high capacity of 430 mA h g−1 at a current density of 0.1 A g−1 as well as excellent 100 mA h g−1 specific capacity after 5000 cycles, with a high current density of 10.0 A g−1. A reversible capacity of 81 mA h g−1 can even be achieved with a low temperature of −20 °C at a current density of 2.0 A g−1 after 3500 cycles. The superior electrochemical performance comes from the intercalation of PEG molecules, which can improve kinetic transport and structural stability during the cycling process. The Zn2+ storage mechanism, which provides essential guidelines for the development of high-performance ZIBs, can be found through various ex situ characterization technologies and density functional density calculations.
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