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Designing Layered Na3Ni2SbO6 Cathodes with Hierarchical and Hollow Nanostructure for Sodium‐Ion Batteries

Von Wiley-VCH zur Verfügung gestellt

Layered nanofibers: Hierarchical and porous-structure Na3Ni2SbO6 cathode (NNSO-E) was designed by the electrospinning and subsequent annealing procedure for sodium-ion batteries. This unique nanostructure is conducive to shortening the path of ion diffusion, exposing abundant active sites and buffering the volume expansion, leading to superior cycling and rate properties compared to the pristine NNSO-S cathode.


Abstract

Honeycomb-ordered Na3M2XO6 (M=Ni, Co, Cu; X=Sb, Bi, etc.) layered oxide cathodes have drawn significant attention by virtue of prominent voltage platform and high energy density in sodium-ion batteries (SIBs). However, they usually suffer from inferior rate performance and cycling stability due to sluggish Na+ migration kinetics and low electronic conductivity. Designing layered cathodes with hierarchical nanostructure shows great potential in SIBs owing to enhanced charge transfer and reaction kinetics. Herein, layered Na3Ni2SbO6 nanofibers with hierarchical and porous-structure were prepared through simple electrospinning and subsequent annealing procedure. This unique structure holds the merits of large active surface areas for easy access to the electrolyte, well-guided paths for electrons/ions transfer, excellent buffering ability for deformation stress, and potential to maintain structural integrity over repetitious sodiation/desodiation process. Thus, compared with the Na3Ni2SbO6 synthesized by conventional sol-gel approach, the Na3Ni2SbO6 nanofibers exhibit superior rate performance and capacity capability.

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