Flower-like NiO/ZnO hybrid coated with N-doped carbon layer derived from metal-organic hybrid frameworks as novel anode material for high performance sodium-ion batteries

J Colloid Interface Sci. 2020 Mar 15:563:354-362. doi: 10.1016/j.jcis.2019.12.090. Epub 2019 Dec 21.

Abstract

Metal-organic hybrid frameworks are considered as the promising precursor to prepare high performance anode materials for sodium-ion batteries (SIBs). In the present work, flower-like NiO/ZnO@NC with hollow and porous structure was prepared via a facile solvothermal and calcination process. The hollow and porous structure not only improve the electron transport capability, and but also inhibits the aggregation and accommodates the volume change of NiO/ZnO@NC. Meanwhile, the coated amorphous carbon layer could also increase the electron conductivity and buffer the huge volume expansion of active material NiO/ZnO. When used as anode for SIBs, NiO/ZnO@NC demonstrates a high specific capacity of 300 mAh g-1 with good cycling stability for 150 cycles, fast charge and discharge capability (154 mAh g-1 at 2500 mA g-1) and superior long cycling life at high current density for 2500 cycles. The strategy in this work should provide a new insight into fabrication novel structural anode materials for high performance SIBs.

Keywords: High performance; Metal-organic hybrid frameworks; N-doped carbon layer; NiO/ZnO@NC; Sodium-ion batteries.