1 research outputs found
ZnS-Sb<sub>2</sub>S<sub>3</sub>@C Core-Double Shell Polyhedron Structure Derived from Metal–Organic Framework as Anodes for High Performance Sodium Ion Batteries
Taking advantage
of zeolitic imidazolate framework (ZIF-8), ZnS-Sb<sub>2</sub>S<sub>3</sub>@C core-double shell polyhedron structure is
synthesized through a sulfurization reaction between Zn<sup>2+</sup> dissociated from ZIF-8 and S<sup>2–</sup> from thioacetamide
(TAA), and subsequently a metal cation exchange process between Zn<sup>2+</sup> and Sb<sup>3+</sup>, in which carbon layer is introduced
from polymeric resorcinol-formaldehyde to prevent the collapse of
the polyhedron. The polyhedron composite with a ZnS inner-core and
Sb<sub>2</sub>S<sub>3</sub>/C double-shell as anode for sodium ion
batteries (SIBs) shows us a significantly improved electrochemical
performance with stable cycle stability, high Coulombic efficiency
and specific capacity. Peculiarly, introducing a carbon shell not
only acts as an important protective layer to form a rigid construction
and accommodate the volume changes, but also improves the electronic
conductivity to optimize the stable cycle performance and the excellent
rate property. The architecture composed of ZnS inner core and a complex
Sb<sub>2</sub>S<sub>3</sub>/C shell not only facilitates the facile
electrolyte infiltration to reduce the Na-ion diffusion length to
improve the electrochemical reaction kinetics, but also prevents the
structure pulverization caused by Na-ion insertion/extraction. This
approach to prepare metal sulfides based on MOFs can be further extended
to design other nanostructured systems for high performance energy
storage devices