Nitrogen-Doped carbon coated zinc selenide nanoparticles derived from metal−organic framework as high-rate and long-life anode materials for half/full sodium-ion batteries

To address the slow reaction kinetics and poor cyclic stability of ZnSe during sodium storage. In this study, the two-dimensional network structure [Zn(L3)·H2O]n (ZnL, L=5-aminoisophthalic acid) was firstly successfully prepared by a simple solvothermal reaction. Then, nitrogen-doped carbon coated ZnSe nanoparticle composites (denoted as ZnSe@NC) were obtained by salinization of ZnL. Benefiting from the synergistic effect of ZnSe nanoparticles and NC, ZnSe@NC demonstrated ultra-long cycling stability (a capacity decay rate of only 0.052% per cycle) and high rate performance (400.6/311.1 mAh g−1 at 0.1/10 A g−1). The excellent electrochemical properties of ZnSe@NC can be attributed to high pseudocapacitance contribution, low charge transfer impedance, and high ion diffusion coefficient. In addition, ex-situ XRD, XPS, and HRTEM analysis revealed that the sodium storage process of ZnSe@NC is a conversion reaction followed by an alloying reaction. More importantly, the sodium-ion full battery Na3V2(PO4)3@rGO//ZnSe@NC can maintain a reversible capacity of 216.4 mAh g−1 after 100 cycles at 0.3 A g−1. This approach provides a promising method for the design of MOFs-derived metal selenide materials for energy storage and conversion.