MOF-Derived ZnSe/N-Doped Carbon Composites for Lithium-Ion Batteries with Enhanced Capacity and Cycling Life

Abstract

In this work, three different morphologies of ZnSe/N-doped carbon (NC) composites are synthesized using ZIF-8 by a facile calcination process. By adjusting the particle size of precursor ZIF-8, the morphology and size of the product ZnSe/NC can be controlled. The as-prepared ZnSe/NC composites show excellent cyclic stability and rate capability as anode materials in lithium-ion batteries (LIBs). Especially, the as-obtained ZnSe/NC-300 exhibits reversible discharge capacity of 724.4 mAh g⁻¹ after 500 cycles at 1 A g⁻¹. The introduction of N-doped carbon can significantly improve the conductivity of ZnSe and promotes the transfer of electrons. And mesoporous structure is conducive to the penetration of electrolyte in active materials, increases the contact area, and alleviates the volume expansion during the charge-discharge process. Thus, ZnSe/NC composites provide a new insight into the development of anode materials for next-generation high-performance LIBs.