Conductive Metal–Organic Frameworks Anchoring on V3O7·H2O Nanobelts Toward High-Capacity and Long-Life Zinc-Ion Batteries

Abstract

Layered vanadium oxides, characteristic of multi-electron redox reactions, have significantly expanded the achievable practical capacity in zinc-ion batteries. However, the low electrical conductivity and sluggish reaction kinetics still hinder their practical applications. Herein, anchoring strategy is demonstrated through conductive metal–organic frameworks composed of Cu and ligands of hexahydroxytriphenylene (Cu-HHTP) anchored on V3O7·H2O nanobelts via π-d conjugation interaction. The resulting anchored Cu-HHTP remarkably enhances the electrical conductivity of V3O7·H2O nanobelts, and provides fast reaction kinetics and efficient Zn2+ store sites. The as-assembled batteries of Zn||VO@Cu-HHTP-2 possess a specific capacity of 518 mAh g−1 at 0.2 A g−1. They achieve 5000 times cycling life with a high retention rate of 81% at 10 A g−1. Furthermore, the pouch batteries still keep the charge and discharge time of 3700 s under violent deformation. Therefore, it is believed that this reliable anchoring fabrication strategy through conductive metal–organic frameworks will pave the way for high-performance zinc ion batteries.