Polyiodide shuttle inhibition in ethylene glycol-added aqueous electrolytes for high energy and long-term cyclability of zinc–iodine batteries

Abstract

Developing high-performance cathode materials matchable with zinc anodes is critical for the practical application of aqueous Zn metal batteries. Although cathodes based on the iodine conversion chemistry is appealing owning...

Advancements in aqueous zinc–iodine batteries: a review

“…Additionally, the optimization of surface functional groups on carbon materials and the construction of hierarchical porous structures also exerts positive effects on both the anchoring effect and redox reaction of active materials. Zhang et al 59 used a high-density ordered porous graphene (HOPG) as the iodine host. The HOPG has a large amount of micropores and higher specific surface area owing to the KOH etching of GO during the preparation process, which can accommodate more active species.…”

“…An SZIB that parades an enviable energy density of 334.3 W h L −1 at 1.5 kW L −1 and an awe-inspiring cycling stability spanning 15 000 cycles, retaining 97.6% capacity. 59 …”

Suppressing the Shuttle Effect of Aqueous Zinc–Iodine Batteries: Progress and Prospects

“…As a simple and effective way, electrolyte additives have achieved significant results in inhibiting the shuttle effect of polyiodines and regulating the deposition behavior of Zn 2+ , but selecting appropriate additives is a challenging task. Zhang et al [115] found that adding ethylene glycol (EG) to the aqueous electrolyte can produce strong bonds with polyiodides in the solution, thereby inhibiting the shuttle effect of the polyiodides. At the same time, ethylene glycol can also change the coordination environment of zinc, regulate the deposition morphology of zinc, and inhibit the generation of zinc dendrites, thus greatly improving the cycle life of aqueous zinc iodide batteries.…”

Metal–iodine batteries: achievements, challenges, and future

“…Recently, polyethylene glycol (PEG400) and ethylene glycol (EG) additives have been reported to inhibit the formation and shuttling of I 3 − by complexing with I 2 . 203,204 Additionally, Zhao et al introduced vermiculite nanosheets (VS) into a 1 M ZnSO 4 solution to form a VS suspended electrolyte. 205 By leveraging the interaction between polyiodide and silica-oxygen bonds present in the VS, the dissolved polyiodide elegantly binds to the scattered VS particles in the bulk electrolyte, thus triumphantly alleviating the pernicious shuttle effect.…”