Aqueous Hybrid Ion Battery Research Articles

Using redox electrolytes to extend the charge storage capacity in an aqueous hybrid ion battery

Aqueous hybrid Zn2+/Na+ ion batteries (AHZSIBs) have gained considerable attention for stationary energy storage applications because of their outstanding safety, sustainability, abundance, and low raw material costs. However, the low capacity values (<100 mAh/g) of the Na+ ion deinsertion/insertion cathodes limit the overall capacity storage of AHZSIBs. Herein, we propose a novel concept to extend the charge storage performance of AHZSIBs using electrolyte with redox characteristics. The benefits of using redox aqueous electrolytes such as 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPOL) and sodium ferrocyanide (Na4[Fe(CN)6]) were investigated in an AHZSB, which consists of Zn metal as an anode and sodium nickel hexacyanoferrate (Na-NiHCF) as the Na+ deinsertion/insertion cathode. The proposed AHZSB using Na4[Fe(CN)6] redox electrolyte provided a capacity (144 mAh/g) that was ~2.94 times higher than AHZSIB using a conventional Na2SO4 electrolyte (49 mAh/g). This capacity enhancement emanated from the faradaic contribution of the Fe2+(CN)64−/Fe3+(CN)63− redox pair present in the electrolyte and Fe2+/Fe3+ redox pair in the lattice of Na-NiHCF. In addition, the TEMPOL-based redox electrolyte also improved the capacity (from 49 to 120 mAh/g) through the combined faradaic contribution of the TEMPOL/TEMPOL+ redox pair dissolved in the electrolyte and the Fe2+/Fe3+ redox pair in the Na-NiHCF lattice. These results confirm the competence of the redox electrolyte in AHZSIB in enhancing the charge storage capacity. We anticipate that this proof-of-concept study will provide a new direction for developing high-capacity storage AHZSIBs. More importantly, this approach can be used in any aqueous/non-aqueous batteries.

Selection of AHI + SC Hybrid Storage Based on Mathematical Models and Load Variation Characteristics

The article deals with the design of a hybrid storage consisting of Aqueous Hybrid Ion battery (AHI) and supercapacitor (SC) modules. The selection of components is based on the knowledge of the load profile of the storage and the AHI battery and supercapacitor models. The paper presents the method of selecting components of the storage made of AHI batteries and supercapacitor modules The article includes an example of the hybrid storage design intended for the supply of household electric appliances.

Development of a novel gel-like composite polymer separator for 3D Zn/LiFePO4 aqueous hybrid ion battery

Aqueous rechargeable Li-ion batteries have evolved as a sphere of concentrated investigation due to their properties and economic benefits. Among all existing systems of aqueous batteries, Zn||LiFePO4 hybrid cells have gained much attention, but are hindered by dendrite growth. 3-dimensional structure could be a promising solution to address the above-mentioned problem. In the given study we report a successful development of 3D-structured anode with a gel-like composite polymer separator.

Zn/V2O5 Aqueous Hybrid-Ion Battery with High Voltage Platform and Long Cycle Life.

Aqueous zinc-ion batteries attract increasing attention due to their low cost, high safety, and potential application in stationary energy storage. However, the simultaneous realization of high cycling stability and high energy density remains a major challenge. To tackle the above-mentioned challenge, we develop a novel Zn/V2O5 rechargeable aqueous hybrid-ion battery system by using porous V2O5 as the cathode and metallic zinc as the anode. The V2O5 cathode delivers a high discharge capacity of 238 mAh g-1 at 50 mA g-1. 80% of the initial discharge capacity can be retained after 2000 cycles at a high current density of 2000 mA g-1. Meanwhile, the application of a "water-in-salt" electrolyte results in the increase of discharge platform from 0.6 to 1.0 V. This work provides an effective strategy to simultaneously enhance the energy density and cycling stability of aqueous zinc ion-based batteries.

A High Voltage Grid-Tied Stationary Energy Storage Demonstration Based on The Aqueous Hybrid Ion Battery System

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