Simultaneously Tailoring Zinc Deposition and Solvation Structure by Electrolyte Additive

Abstract

Aqueous zinc ion batteries (AZIBs) have attracted intense attention due to their high safety and low cost. Unfortunately, the serious dendrite growth and side reactions of the Zn metal anode in an aqueous electrolyte result in rapid battery failure, hindering the practical application of AZIBs. Herein, sodium gluconate as a dual-functional electrolyte additive has been employed to enhance the electrochemical performance of AZIBs. Gluconate anions preferentially adsorb on the surface of the Zn anode, which effectively prevents H 2 evolution and induces uniform Zn deposition to suppress dendrite growth. Moreover, the gluconate anions can highly coordinate with Zn 2+ , promoting the dissolution of [Zn(H 2 O) 6 ] 2+ to inhibit side reactions and the water-induced corrosion reaction. As a result, the Zn||Zn symmetric battery exhibits a long-term cycling stability of over 3000 h at 1 mA cm −2 /1 mA h cm −2 and 600 h at 10 mA cm −2 /10 mA h cm −2 . Furthermore, the NH 4 V 4 O 10 ||Zn full battery also displays excellent cycling stability and a high reversible capacity of 193 mA h g −1 at 2 A g −1 after 1000 cycles. Given the low-cost advantage of SG, the proposed interface chemistry modulation strategy holds considerable potential for promoting the commercialization of AZIBs.

Multifunctionalized Supramolecular Cyclodextrin Additives Boosting the Durability of Aqueous Zinc-Ion Batteries

“…Over the past few decades, lithium-ion batteries have achieved great success in various consumer electronics, portable devices, and electric vehicles. − However, with the increasing costs, the safety issue arising from the flammability of organic electrolytes, and the demand of high energy density, it is urgent to explore the next-generation energy storage technologies. , As one of the most promising candidates for large-scale energy storage, aqueous zinc-ion batteries have sparked great interest among researchers due to their low cost, intrinsic safety, environmental friendliness, and high theoretical capacity of zinc metal. − However, in order to achieve the commercial applications of aqueous zinc-ion batteries, there are still many technical obstacles to be overcome, such as the low coulombic efficiency (CE), severe dendrite growth, hydrogen evolution, formation of byproducts on the Zn anode surface, and so on . Therefore, many strategies have been proposed to address the above issues of the Zn anode, including electrolyte composition optimization, , interface modification, structure design, and so on.…”