1 research outputs found
Highly Electrically Conductive Polyiodide Ionic Liquid Cathode for High-Capacity Dual-Plating Zinc–Iodine Batteries
Zinc–iodine batteries are one of the most intriguing
types
of batteries that offer high energy density and low toxicity. However,
the low intrinsic conductivity of iodine, together with high polyiodide
solubility in aqueous electrolytes limits the development of high-areal-capacity
zinc–iodine batteries with high stability, especially at low
current densities. Herein, we proposed a hydrophobic polyiodide ionic
liquid as a zinc-ion battery cathode, which successfully activates
the iodine redox process by offering 4 orders of magnitude higher
intrinsic electrical conductivity and remarkably lower solubility
that suppressed the polyiodide shuttle in a dual-plating zinc–iodine
cell. By the molecular engineering of the chemical structure of the
polyiodide ionic liquid, the electronic conductivity can reach 3.4
× 10–3 S cm–1 with a high
Coulombic efficiency of 98.2%. The areal capacity of the zinc–iodine
battery can achieve 5.04 mAh cm–2 and stably operate
at 3.12 mAh cm–2 for over 990 h. Besides, a laser-scribing
designed flexible dual-plating-type microbattery based on a polyiodide
ionic liquid cathode also exhibits stable cycling in both a single
cell and 4 × 4 integrated cell, which can operate with the polarity-switching
model with high stability