Oxygen vacancies-rich cobalt-doped NiMoO4 nanosheets for high energy density and stable aqueous Ni-Zn battery

Abstract

The enhancement of energy density and cycling stability is in urgent need for the widespread applications of aqueous rechargeable Ni-Zn batteries. Herein, a facile strategy has been employed to construct hierarchical Co-doped Ni-MoO 4 nanosheets as the cathode for high-performance Ni-Zn battery. Benefiting from the merits of substantially improved electrical conductivity and increased concentration of oxygen vacancies, the NiMoO 4 with 15% cobalt doping (denoted as CNMO-15) displays the best capacity of 361.4 mA h g −1 at a current density of 3 A g −1 and excellent cycle stability. Moreover, the assembled CNMO-15//Zn battery delivers a satisfactory specific capacity of 270.9 mA h g −1 at 2 A g −1 and a remarkable energy density of 474.1 W h kg −1 at 3.5 kW kg −1 , together with a maximum power density of 10.3 kW kg −1 achieved at 118.8 W h kg −1 . Noticeably, there is no capacity decay with a 119.8% retention observed after 5000 cycles, demonstrating its outstanding long lifespan. This work might provide valuable inspirations for the fabrication of high-performance Ni-Zn batteries with superior energy density and impressive stability.

Nickel‐Based Materials for Advanced Rechargeable Batteries

“…In addition, owing to the various oxidation states and competitive electrical conductivity, bimetallic oxide, such as, NiMn x O y , [ 312 ] NiMoO 4 , [ 313 ] and NiCo 2 O 4 , [ 314 ] have attracted great attention in Ni‐based aqueous batteries. Shen et al.…”

Facile synthesis of nitrogen-doped mesoporous hollow carbon nanospheres@NiCo2O4 for high-performance supercapacitors

“…Therefore, metal oxides are more used for electrode materials than conductive polymers [16]. Among many metal oxides, spinel-structured materials have received great attention in recent years, such as NiCo-LDH [14] MnCo 2 O 4 [17,18], ZnMn 2 O 4 [19] , CuCo 2 O 4 [20], NiMoO 4 [21][22][23], and NiCo 2 O 4 /CeO 2 [24]. The jail's team prepared the hexagonal NiCo 2 O 4 nanostructures, and the NiCo 2 O 4 nanostructures exhibited good electrochemical performance with a maximum specific capacitance of 254.1 mAh g −1 at a current density of 1 A g −1 [1].…”

MOF-derived NiCo2S4 and carbon hybrid hollow spheres compactly concatenated by electrospun carbon nanofibers as self-standing electrodes for aqueous alkaline Zn batteries

“…So far, a large number of advanced cathode materials, such as Ni(OH) 2 , Co 3 O 4 , NiO, Ni-Co LDH, NiCo 2 O 4 , and NiMoO 4 , have been reported. [15][16][17][18][19][20][21][22][23][24] For example, Lu and coworkers demonstrated that the performance of NiCo 2 O 4 nanosheets was greatly enhanced by oxygen-vacancies and surface phosphate ion modulation. 19 Chen and coworkers reported F doped Ni/Co hydroxides/oxides/phosphides as the cathode materials and the effect of anion substitution was deeply investigated.…”