“Dual‐ Engineering” Strategy to Regulate NH₄V₄O₁₀ as Cathodes for High‐Performance Aqueous Zinc Ion Batteries

Abstract

Aqueous zinc ion batteries (AZIBs) have attracted attention as a promising candidate for secondary battery energy storage due to their safety and environmental benefits. However, the vanadium‐based cathode material NH4V4O10 has the problem of structural instability. In this paper, it is found by density functional theory calculation that excessive NH4+ located in the interlayer will repel the Zn2+ during the process of Zn2+ insertion. This results in the distortion of the layered structure, further affects the diffusion of Zn2+ and reduces the reaction kinetics. Therefore, part of the NH4+ is removed by heat treatment. In addition, the introduction of Al3+ into the material by hydrothermal method is able to further enhance its zinc storage properties. This dual‐engineering strategy shows excellent electrochemical performance (578.2 mAh g−1 at 0.2 A g−1). This study provides valuable insights for the development of high performance AZIBs cathode materials.

Hydrated Calcium Vanadate Nanoribbons with a Stable Structure and Fast Ion Diffusion as a Cathode for Quasi-Solid-State Zinc-Ion Batteries

“…To gain a deeper understanding of the electrochemical kinetics of Zn 2+ in the CaVO-2 electrode, galvanostatic intermittent titration technique (GITT) tests were performed (Figure f). , GITT measurements were collected for 30 min at 100 mA g –1 with a resting time of 120 min (Figure g). The detailed calculations of the Zn 2+ diffusion coefficient ( D Zn ) are described in the Supporting Information.…”

Stable zinc anode by regulating the solvated shell and electrode–electrolyte interface with a sodium tartrate additive

“…The battery's electrochemical performance is also a significant marker of its commercial viability. 62 Therefore, V 2 O 5 was used as a cathode and the Zn sheet as an anode to fabricate the full cell to verify the feasibility of adding STA. In the initial stage, cyclic voltammetry (CV) was carried out on the Zn||V 2 O 5 full cell in the blank electrolyte and the electrolyte containing STA, as shown in Fig.…”

Ammonium vanadate doped by hydrated manganese divalent ions for high-performance zinc-ion batteries

“…), structural water molecules, or polymers (PEDOT and PANI) in between the layers of V-based oxides to expand the interlayer spacing has been found to be a promising approach to improving the comprehensive performance including capacity and structural stability [36][37][38]. On the other hand, ammonium vanadate (NH 4 V 4 O 10 ), derived from V 2 O 5 , exhibits a low density and high storage capacity [39]. However, an excess of NH 4 + in between the layers poses challenges to the intercalation process of Zn 2+ and signi cantly deteriorates the charge storage ability accordingly [40].…”