Nickel@Nickel Oxide Dendritic Architectures with Boosted Electrochemical Reactivity for Aqueous Nickel–Zinc Batteries

Abstract

Rechargeable alkaline zinc‐ion batteries (ZIBs) have gained extensive attention on account of their inexpensiveness, and high levels of safety and output voltage, but the lack of suitable cathode materials with high energy storage property and long cycle stability limits further development of ZIBs. Herein, we report an effective two‐step electrochemical approach to prepare Ni@NiO core‐shell dendritic architectures as cathode material for rechargeable alkaline ZIBs. Benefiting from the highly active NiO shell and unique core‐shell structure, this Ni@NiO electrode shows an excellent discharge capacity (0.112 mAh cm−2, at 4 mA cm−2) and a high rate capability (63.7 % capacity retention at 40 mA cm−2). Furthermore, the alkaline ZIBs with this Ni@NiO cathode also displays a high energy density of 0.193 mWh cm−2 and a remarkable power density of 65.0 mW cm−2.

Cu-Ni-Based Alloys from Nanopowders as Potent Thermoelectric Materials for High-Power Output Applications

“…The Sn-alloyed samples also exhibit dark blue, Ni-rich spots. Here, a beginning dendritic growth of this inclusion becomes apparent, which has been reported for NiO before [35][36][37]. It is assumed, that the formation of NiO is also a result of the utilization of nanopowders, which are susceptible to oxidation due to their high surface area.…”

Corrosion engineering towards a high-energy Mn doped Co3O4 nanoflake cathode for rechargeable Zn-based batteries

“…The outstanding energy storage ability of Zn//MCO is highlighted by the comparison with recently reported Zn based alkaline batteries, in which Zn//MCO batteries show substantially superior performance. 20,[25][26][27][28][29][30][31] The energy density and power density of Zn//MCO batteries (based on the cathode area) is calculated to be 0.612 mWh cm -2 and 18 mW cm -2 , which is obviously higher than that of lately reported cathode materials for alkaline batteries (Fig. S7).…”

A High‐Capacity and High‐Voltage Aqueous Zn‐Polymer Battery with Self‐Charging Function

“…For comparison, energy and power densities of some other AZIBs in literature are marked as well in Figure 2f. Electrode materials of these ZIBs in include MnO 2 , [ 22 ] CNTs‐MnO 2 , [ 23 ] Bi‐PYDC, [ 24 ] PB@EG, [ 25 ] Zn‐I 2 , [ 26 ] Ni‐Zn, [ 27 ] Ni@NiO, [ 28 ] and CNF@NiCo 2 S 4 . [ 29 ]…”

“…For comparison, energy and power densities of some other AZIBs in literature are marked as well in Figure 2f. Electrode materials of these ZIBs in include MnO 2 , [22] CNTs-MnO 2 , [23] Bi-PYDC, [24] PB@EG, [25] Zn-I 2 , [26] Ni-Zn, [27] Ni@NiO, [28] and CNF@NiCo 2 S 4 . [29] To further understand the charge storage process of the poly(4-HDPA)/AC cathode, CV loops at different voltage scan rates ranging from 0.1 to 0.6 mA s −1 were collected from a full cell with AC mass loading of 4.5 mg cm −2 in the cathode, as shown in Figure 2g.…”