Enhanced Reversible Zinc Ion Intercalation in Deficient Ammonium Vanadate for High-Performance Aqueous Zinc-Ion Battery

Abstract

Ammonium vanadate with bronze structure (NH4V4O10) is a promising cathode material for zinc-ion batteries due to its high specific capacity and low cost. However, the extraction of $${\text{NH}}_{{4}}^{ + }$$ NH 4 + at a high voltage during charge/discharge processes leads to irreversible reaction and structure degradation. In this work, partial $${\text{NH}}_{{4}}^{ + }$$ NH 4 + ions were pre-removed from NH4V4O10 through heat treatment; NH4V4O10 nanosheets were directly grown on carbon cloth through hydrothermal method. Deficient NH4V4O10 (denoted as NVO), with enlarged interlayer spacing, facilitated fast zinc ions transport and high storage capacity and ensured the highly reversible electrochemical reaction and the good stability of layered structure. The NVO nanosheets delivered a high specific capacity of 457 mAh g−1 at a current density of 100 mA g−1 and a capacity retention of 81% over 1000 cycles at 2 A g−1. The initial Coulombic efficiency of NVO could reach up to 97% compared to 85% of NH4V4O10 and maintain almost 100% during cycling, indicating the high reaction reversibility in NVO electrode.

Porous Co2VO4 Nanodisk as a High-Energy and Fast-Charging Anode for Lithium-Ion Batteries

“…Figure S1c displays the high-resolution spectra of V 2p in which two peaks at 516.4 eV and 523.7 eV originated from V 2p 3/2 and V 2p 1/2 , respectively. The two peaks were ascribed to V 4+ [ 36 ]. The O 1 s signal could be fitted into three oxygen components around 529.9, 530.8, and 531.85 eV (Fig.…”

“…The O 1 s signal could be fitted into three oxygen components around 529.9, 530.8, and 531.85 eV (Fig. S1d), which were attributed to the metal–oxygen bonds (M–O), hydroxyl species of surface adsorbed water molecule (M-OH), and oxygen ions in low coordination (O L ), respectively [ 35 , 36 ].

Fig.

…”

“…The rapid capacity decrease is resulted from the conversion reactions, generated volume expansion and formation of SEI layer [ 16 , 25 , 34 , 42 ]. The subsequent capacity increase might be attributed to the increased crystallinity of active materials and gradual activation progress during the cycle [ 17 , 36 , 38 ]. Figure 4 d showed that PCVO ND exhibited excellent fast-charging capacity (a high average capacity of 344.3 mAh g −1 at 10 C for 1000 cycles) and outstanding long-term cycling stability (only 0.024% capacity loss per cycle at 10 C for 1000 cycles).…”

Interfacial Engineering Strategy for High-Performance Zn Metal Anodes

“…Coupled with the urgent need for resources and environmental protection, researchers are urged to vigorously explore new battery systems with high safety, high-cost performance, green environmental protection, and high specific capacity [15,16]. Rechargeable aqueous Zn-ion batteries (RAZIBs) have become one of the best choices for largescale energy storage systems because of their high safety, high capacity, low cost, and low redox potential [17][18][19][20][21][22][23]. The Zn-MnO 2 battery using an alkaline electrolyte, which can be charged and discharged repeatedly, was successfully developed in the 1960s.…”

A Simple Route to Fabricate an Artificial Interface Protective Layer on a Zn Anode for Aqueous Zn‐Ion Batteries

“…Lithium ion batteries (LIBs) with excellent reversible capacity and rate property have been used in electronic goods and grid storage on a large scale [1–4] . However, some inevitable disadvantages of LIBs, such as less lithium resources, poisonous electrolytes, flammable and high cost and so on, limit its further developments [5–8] . Therefore, numerous interests in exploring the aqueous batteries (e. g., Zn, Al, Mg) have been intensified dramatically for as much as their low cost, environment‐friendly, and high safety [9,10] .…”