Cost-Effective Hydrogen-Bonded Organic Framework-Based Separator for Highly Stable Zinc–Iodine Batteries

As a promising technology, aqueous zinc-ion batteries (ZIBs) represent a sustainable direction for future electrochemical energy storage systems. However, ZIBs have encountered a series of practical application problems, including the dissolution of the cathode material and sluggish kinetics, which eventuate rapid capacity decline and poor performance. In this study, we designed a novel cellulose separator modified by a hydrogen-bonded organic framework, which is called the FP/mHOF. FP/mHOF shows great performance, including suppressing capacity decay, boosting charge transfer kinetics, and mass transfer kinetics. FP/mHOF achieved stable cycling performance for 2000 cycles at the current density of 5 A g–1 and 850 cycles at 2 A g–1, whose capacity retention was up to 90.2 and 77.2%, respectively. As verified, HOF@FP shows great potential of being a next-generation separator for ZIBs.