Cyanide Bridged Framework Nanoplates Catalytic Interlayer for High Performance Zinc‐Iodine Battery

Abstract

Iodine is a promising candidate among the cathode materials in zinc‐ion battery. However, iodine cathode suffers from serious shuttle effect by spontaneous generated polyiodide species. In this work, we developed a CoNi(CN)4/CNT interlayer to prevent shuttle effect by adsorption‐catalysis process. The adsorption of the iodine species on CoNi(CN)4/CNT interlayer is justified by UV‐vis spectroscopy and X‐ray photoelectron spectroscopy, where the concentration of polyiodides is significantly reduced, and the binding energy of cobalt, nickel, and nitrogen is remarkably reduced by binding with polyiodides. The zinc‐iodine dual‐plating battery shows significantly higher areal capacity and cycle stability with CoNi(CN)4/CNT. Moreover, battery with impressive areal capacity of 3.6 mAh cm‐2 and negligible fading over 100 cycles is also achieved, which outperforms state‐of the art literatures on zinc‐iodine batteries.