Solid-electrolyte interphase (SEI) is highly designable to restrain Zn dendrite growth and side reactions between Zn anode and water in rechargeable aqueous zinc-ion batteries (RAZBs), but it remains a challenge....
Rechargeable aqueous zinc-ion batteries possess the merits of good environmental benignity, high operational safety and high-energy density. Nevertheless, the practical application of zinc-ion batteries are severely obstructed by the inhomogeneous...
Conversion-type anodes with high theoretical capacity have attracted enormous interest for lithium storage, although their extremely poor conductivity and volume variations during lithiation−delithiation processes seriously limit their practical applications.
Zn-ion batteries are re-evaluated as a potential choice to address the safety issue and cost concerns of current energy storage systems. Unfortunately, further application is severely hindered by low coulombic efficiency and poor cycle life, which are caused by the undesirable dendrite growth and side reactions on metal Zn anode. Herein, ethylenediaminetetraacetic acid (EDTA) is employed as an electrolyte additive to solve the problem. The functional groups of EDTA adsorption layer on Zn foil results in refined grains by providing abundant nucleation sites for initial deposition and further induces uniform and flat Zn deposition without dendrites. Moreover, the chelation of EDTA with Zn 2+ changes the coordination environment of hydrated Zn 2+ and suppresses the side reactions. The smooth deposition of Zn endows the Zn anodes with super stability in both symmetric cells and Zn−V 2 O 5 full cells. This work provides a simple and feasible approach for solving anode issues in high-performance and safe Zn-ion batteries.
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