A high capacity aqueous zinc-based chlorine ion battery improved by zinc selenide-modified anode.

We have proposed a zinc-based chlorine ion battery improved by ZnSe-modified anode. The new type of modified anode improved the capacity to 177.4mAh g−1 and expanded the cycle life to 2500 times. We provide a new strategy to match the electrolyte with electrode and have a reference significance to zinc ion battery. [Display omitted] • A new type of ZnSe-modified anode is designed for chlorine ion battery. • The capacity is released to 177mAh g−1 and the cycle life is expanded to 2500 times. • The water-in-salt electrolyte system broaden the electrochemical window of aqueous electrolyte. • A method to match electrolyte with electrode is proposed and has significance to zinc ion battery. Chloride ion battery (CIB) is a novel anionic battery first reported in 2013. The high open circuit voltage and high theoretical capacity have attracted wide attention. However, its low cycle life imposes restrictions on its application. Since the electrochemical performance of zinc anode in chloride ion batteries is different from zinc ion batteries, we attempted to modify the zinc anode with kinds of strategies or addictives to match the zinc electrode with the zinc-free electrolyte and finally found the positive influence of ZnSe. The zinc selenide-modified anode improved the capacity to 177.4mAh g−1 and expanded the cycle life to 2500 times. Besides, our work may also have reference significance for other zinc based batteries. The mechanism of anode was analyzed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) as well as high-definition scanning electron microscopy (HD SEM) and simulated by adsorption models. The electrochemical performance of the anode was tested by cyclic voltammetry (CV) and the full cell was test on BTS4000 battery program-control test system. [ABSTRACT FROM AUTHOR]