Fabricating an N-Doped Zn3B2O6 Polyhedral Composite Derived from a Zn-MOF with Phenylboronic Acid Ligands as Electrode Material for Sodium-Ion Batteries

摘要

A polyhedral Zn-based MOF [Zn (B-BDC) (Dpy)] center dot H2O (B-BDC = 3, 5-Dicarboxyphenylboronic acid, Dpy = 4, 4'-Bipyridine) (CCDC: 1559247), named Zn-BDC, has been initially designed and constructed via hydrothermal method. Then, its crystal structure, morphology and thermal properties were confirmed by using a series of characterization methods. Furthermore, composite materials, denoted as Zn-BDC-T (T = pyrolysis temperature), were synthesized by directly calcining Zn-BDC under N-2 atmosphere at different temperatures. Herein, Zn-BDC-800 was recognized as N-doped Zn3B2O6 composite according to characterization results. When the Zn-BDC-800 was used as electrode materials for sodium-ion batteries, it exhibited a maximum discharge specific capacity of 295.6 mAhg(-1) at the current density of 50 mAg(-1) and its coulombic efficiency still remained at 99% after 100 cycles. Thus, this N-doped Zn3B2O6 polyhedral composite derived from Zn-MOF has broad development prospects in the field of SIBs.