Zinc pyrovanadate nanosheets of atomic thickness: excellent Li-storage properties and investigation of their electrochemical mechanism

摘要: Exploring ternary metal oxides that can in situ form an elastic medium to accommodate volume changes upon lithium intercalation is now a popular and effective way achieve high-performance ion batteries with enhanced cycling stability. Herein, we report ultrathin zinc pyrovanadate nanosheet of atomic thickness exposed (001) facets via facile hydrothermal method. Morphological structural evolutions the are investigated reveal electrochemical reaction mechanism this compound towards intercalations for first time. It found initial transforms into ZnO nanoparticles LiV2O5 cycle, subsequent mainly occurs between LiZn lithiation/delithiation vanadate. Interestingly, formed lithiated vanadate matrix could serve as conductive network reversible process ZnO. The favour shortening pathways ions, while specific facilitated architecture embedded amorphous owing sandwich-like skeleton constructed from layer-by-layer stacking [ZnO6] [V2O7] polyhedra chains projected along c axis. Benefiting these inspiring merits, as-synthesized exhibits high capacity (963 mA h g−1 at 0.05 A g−1), outstanding rate capability (344 10 long cycle life (602 be maintained after 980 cycles 1 g−1) regarded promising candidate battery anode materials.