Manipulating OH⁻‐Mediated Anode‐Cathode Cross‐Communication Toward Long‐Life Aqueous Zinc‐Vanadium Batteries

Abstract

The anode-cathode interplay is an important but rarely considered factor that initiates the degradation of aqueous zinc ion batteries (AZIBs). Herein, to address the limited cyclability issue of V-based AZIBs, Al 2 (SO 4 ) 3 is proposed as decent electrolyte additive to manipulate OH À -mediated cross-communication between Zn anode and NaV 3 O 8 • 1.5H 2 O (NVO) cathode. The hydrolysis of Al 3 + creates a pH � 0.9 strong acidic environment, which unexpectedly prolongs the anode lifespan from 200 to 1000 h. Such impressive improvement is assigned to the alleviation of interfacial OH À accumulation by Al 3 + adsorption and solid electrolyte interphase formation. Accordingly, the strongly acidified electrolyte, associated with the sedated crossover of anodic OH À toward NVO, remarkably mitigate its undesired dissolution and phase transition. The interrupted OH À -mediated communication between the two electrodes endows Zn j j NVO batteries with superb cycling stability, at both low and high scan rates.

Reversible adsorption with oriented arrangement of a zwitterionic additive stabilizes electrodes for ultralong-life Zn-ion batteries

“…The high binding energy endows zwitterionic additives with the ability of reconstituting the Zn 2+ solvation structure for regular Zn plating/stripping behaviors. 12 Possibly due to the existence of polar hydroxyl groups, l -CN displays a stronger binding ability compared with Bet.…”

Recent progress of dendrite‐free stable zinc anodes for advanced zinc‐based rechargeable batteries: Fundamentals, challenges, and perspectives

“…Generally, zinc ions with comparatively high charge state, perform as solvated Zn 2+ surrounded by six water molecules, which will shuttle between the cathode and anode electrodes in aqueous electrolytes. It should be pointed out that the Zn 2+ solvation structure could be changed with the highconcentration electrolytes, [162][163][164][165] accompanied by the increased viscosity of the electrolyte. The decreased ionic conductivity attributes to battery break-off at high rates, leading to the inferior energy density and power density.…”

Tailoring Anion Association Strength Through Polycation‐Anion Coordination Mechanism in Imidazole Polymeric Ionic Liquid‐Based Artificial Interphase toward Durable Zn Metal Anodes

“…Additionally, the abundant resource of Zn in Earth's crust reflects a large-scale energy storage system prospect. [2] However the practical application of AZIBs is still stymied by short lifespan and low coulombic efficiency. [3] The main problems of Zn anode confronted include the following aspects:…”