Abstract
It is synthesized Sr0.22V2O5(H2O)·H2O (SrVO) microflowers with an interlayer spacing of 13.1 Å. Rietveld refinement reveals two separate V–O–V monolayers in SrVO with the (001) facet as the division plane, which can promote the Zn2+ migration along the (001) surface of SrVO with an ultralow energy barrier of 0.40 eV, as evidenced by density functional theory (DFT) simulations. SrVO shows a high capacity of 460 mAh g−1 at 0.1 A g−1 and an unprecedented ultralong cycle life with a capacity retention of ∼97.4% over 10000 cycles at 5 A g−1 due to the pseudo-reversible structural transformation. Besides, it is investigated the effect of the pH value of the electrolyte solution. It is found that the in situ-generated Znx(OTf)y(OH)2x-y·nH2O phase (OTf− = CF3SO3−) can act as the cathode protective layer to retard the deep intercalation of Zn2+ into SrVO, thus alleviating the irreversible transformation of SrVO → Zn3(OH)2V2O7·2H2O.
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