The shortage of lithium resources is promoting the development of cost-efficient battery candidates, especially aqueous rechargeable batteries (ARBs) with high safety and power density. Copper hexacyanoferrate (CuHCF) nanoparticles with high redox potential and rate capability is employed as the battery cathode for hosting ammonium-ion coupling with low-cost zinc anode. Benefiting from the selective ammonium-ion channel in CuHCF, an aqueous rechargeable zinc ammonium hybrid battery is successfully engineered. It presents high cell voltage (1.8 V), outstanding rate performance, low self-discharge, and satisfactory energy density of 114 Wh kg–1 in consideration of total electrodes’ active mass.

Aqueous rechargeable batteries (ARBs) have become a lively research theme due to their advantages of low cost, safety, environmental friendliness, and easy manufacturing. However, since its inception, the aqueous solution energy storage system has always faced some problems, which hinders its development, such as the narrow electrochemical stability window of water, poor percolation of electrode materials, and low energy density. In recent years, to overcome the shortcomings of the aqueous solution-based energy storage system, some very pioneering work has been done, which also provides a great inspiration for further research and development of future high-performance aqueous energy storage systems. In this paper, the latest advances in various ARBs with high voltage and high energy density are reviewed. These include aqueous rechargeable lithium, sodium, potassium, ammonium, zinc, magnesium, calcium, and aluminum batteries. Further challenges are pointed out.

Unlike traditional metal-ion insertion, the emerging aqueous rechargeable ammonium-ion batteries (ARABs)b rings new battery chemistries for future stationary energy storage. However, low energy density and low durability hindert he further development of ARABs because of the lack of suitable and cost-efficient anodes. In this study,a na queous rechargeable ammonium zinc hybrid battery is fabricated from durable corner-truncated sodium iron hexacyanoferraten anocubes as the cathode and low-cost zinc as the anode. This novel hybridb attery demonstrates an average workingv oltage of 1.3 V, excellent rate capability,a nd ah igh energy density of 81.7 Wh kg À1 at 286 Wkg À1 (based on two electrodes' active mass), as well as a long lifespan with 92.

Aqueous rechargeable batteries (ARBs) are expected to be used in future energy storage systems (ESSs) because of their nontoxicity, nonflammability, and ultrahigh ionic conductivity. However, their low energy density and poor cycle stability are two main drawbacks restricting their application. In this work, we synthesized a highly crystalline monoclinic nickel hexacyanoferrate (NiHCF) and used it in aqueous zinc−sodium hybrid batteries. Because of its low Fe(CN) 6 vacancy amount and low water content, the monoclinic NiHCF exhibits high specific capacity and excellent cycle and rate performance. The assembled AZSHBs show excellent electrochemical performance, with an average operating voltage up to 1.464 V, high energy density of 99.1 Wh kg −1 , and good cycling stability with 91% capacity retention after 1000 cycles.