High performance of HNaV6O16·4H2O nanobelts for aqueous zinc-ion batteries with in-situ phase transf

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Zn(CF3SO3)2 as an electrolyte has been widely used to improve the electrochemical performance for ZIBs due to that the bulky CF3SO3-can reduce the solvation effect of Zn2+ and promote the ionic diffusion.Herein,we found that Zn(CF3SO3)2 electrolyte can induce different electrochemical mechanisms from ZnSO4 electrolyte.Compared to the ZnSO4 electrolyte,the HNaV6O16·4H2O electrode with Zn(CF3SO3)2 electrolyte exhibits a high capacity of 444 mAh·g-1 at 500 mA·g-1 with a capacity retention of 92.3% after 80 cycles.Even,at a high rate of 5 A·g-1,the HNaV6O16·4H2O electrode delivers an initial discharge capacity of 328 mAh·g-1 with a capacity reten-tion of 93.7% after 1000 cycles.Differing from the mechanism with ZnSO4 electrolyte,the excellent cycle stability of HNaV6O16·4H2O electrode can be attributed to the in-situ phase transformation to ZnxV2O5·nH2O based on the co-intercalation of Zn2+/H+.
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