High-Rate and High-Voltage Aqueous Rechargeable Zinc Ammonium Hybrid Battery from Selective Cation Intercalation Cathode

Abstract

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.

Boosting Zn2+ and NH4+ Storage in Aqueous Media via In‐Situ Electrochemical Induced VS2/VOx Heterostructures

“…During the initial cycles, heterostructural VS 2 /VO x demonstrates fast capacity decay due to the side reaction and formation of new phases, and then it stabilizes at 150 mA h g −1 and reaches over 120 mA h g −1 after 50 cycles, the highest value among the state‐of‐the‐art materials for NH 4 + ion storage (Figure 4f). [ 16,17,43–48 ] On the contrary, the C–V curves of VS 2 shown in Figure S19, Supporting Information, exhibit inferior reversibility for NH 4 + ion storage, and the reversible capacity is achieved less than 100 mA h g −1 (Figure 5c ; Figure S20, Supporting Information) with a poor coulombic efficiency below 85% during the cycling. The long‐term cycling performance of VS 2 /VO x heterostructure was also recorded at high current density of 1 A g −1 .…”

Ammonium‐Ion Storage Using Electrodeposited Manganese Oxides

“…in 2012, [3] achievements have been made on NH 4 + storage for aqueous energy storage (Figure 1). Ti 3 C 2 MXene, [4] Prussian blue analogues (e.g., sodium iron hexacyanoferrate, [5] copper hexacyanoferrate, [6] berlin green, [7] ammonium Prussian white [2] ), organic solids (e.g., 3,4,9,10‐perylenetetracarboxylic diimide, [2] polyaniline [8] ), and metal oxides (e.g., titanic acid, [9] V 2 O 5 , [10] MoO 3 , [11] NH 4 V 4 O 10 [8] ) were studied to enrich the NH 4 + ‐storage chemistry. For example, Ji et al.…”

Structure and Properties of Prussian Blue Analogues in Energy Storage and Conversion Applications

“…They also revealed that the NH 4 + intercalation/extraction in Berlin green was of nearly zero strain, thus resulting in enhanced cycling stability as compared with that of the Na + and K + intercalations. [ 119 ] Recently, Huang's group also reported the NH 4 + intercalation in Na‐FeHCF [ 120 ] and Cu‐HCF, [ 121 ] they not only achieved excellent cycling and rate performance via controlling morphologies and sizes of Na‐FeHCF nanocubes, but also revealed the selective NH 4 + channel in CuHCF, which leads to high cell voltage (≈1.8 V) and outstanding rate performance of Zn 2+ /NH 4 + hybrid batteries. In consideration of the high abundance of NH 4 + on earth, further investigations shall be done to develop effective PBA cathode materials for NH 4 + storage, which is of great importance for the development of next‐generation batteries.…”