Hierarchical Porous NiO/β‐NiMoO₄ Heterostructure as Superior Anode Material for Lithium Storage

Abstract

Ternary transition metal oxides (TTMOs) have attracted considerable attention for rechargeable batteries because of their fascinating properties. However, the unsatisfactory electrochemical performance originating from the poor intrinsic electronic conductivity and inferior structural stability impedes their practical applications. Here, the novel hierarchical porous NiO/β‐NiMoO4 heterostructure is fabricated, and exhibits high reversible capacity, superior rate capability, and excellent cycling stability in Li‐ion batteries (LIBs), which is much better than the corresponding single‐phase NiMoO4 and NiO materials. The significantly enhanced electrochemical properties can be attributed to its superior structural characteristics, including the large surface area, abundant pores, fast charge transfer, and catalytic effect of the intermediate product of metallic nickel. The NiO/β‐NiMoO4 heterostructure delivers a high capacity of 1314 mA h g−1 at 0.2 A g−1 after 100 cycles. Furthermore, even after 400 cycles at 1 A g−1, the reversible capacity remains at around 500 mA h g−1. These results indicate that the NiO/β‐NiMoO4 heterostructure shows great potential as an anode material for high‐performance LIBs.

Fe2O3/NiMoO4 Heterostructured Microspheres as an Anode Material for Long‐Life and High‐Performance Lithium Storage

“…Wang et al synthesized hierarchical porous NiO/β-NiMoO 4 heterostructures with a capacity of 1314 mA h g À 1 after 100 cycles at 0.2 A g À 1 . [15] Li et al synthesized NiMoO 4 nanorods/ reduced graphene oxide (rGO) membrane with three-dimensional hierarchical structure. It showed excellent electrochemical property with a specific discharge capacity of 945 mA h g À 1 at 0.25 A g À 1 .…”

“…The strongest diffraction peak at 26.650°belongs to the (220) plane of NiMoO 4 . [15] Figure 1b shows the diffraction pattern of the composite without calcination. The results show that most of the diffraction peaks point to β-FeMoO 4 (JCPDS: 22-0628), while only two diffraction peaks point to α-FeMoO 4 (JCPDS: 22-1115).…”

“…The peaks at 23.836°, 30.272°, 33.955°and 35.684°can be indexed to the (203), (206), (109) and (119) planes of Fe 2 O 3 , respectively. The strongest diffraction peak at 26.650°belongs to the (220) plane of NiMoO 4 [15]. Figure1bshows the diffraction pattern of the composite without calcination.…”

Design and synthesis of hierarchical NiO/Ni3V2O8 nanoplatelet arrays with enhanced lithium storage properties

“… 34–39 For instance, Lou et al 40 successfully synthesized a novel Co 3 O 4 @Co 3 V 2 O 8 hollow structure with a metal organic framework, which exhibited superior electrochemical activity. Bases on the appealing concept, many NiO-based nanocomposites, such as NiO–Co 3 O 4 nanoplate, 41 porous NiO–ZnO hybrid nanofibers 42 and hierarchical porous NiO–NiMoO 4 heterostructure 43 have been fabricated and tested as high-performance anode materials for LIBs. Only very recently, P. Vishnukumar et al 44 successfully synthesized NiO/Ni 3 V 2 O 8 nanocomposite by a solvothermal method, which exhibited outstanding super-capacitive activity.…”

Hierarchical Stratiform of a Fluorine-Doped NiO Prism as an Enhanced Anode for Lithium-Ion Storage

“…Considering these issues, various strategies were proposed to overcome the inherent shortcomings of NiO, such as constructing different nanostructures, carbon coating (combined with the graphene or graphene oxide), and hierarchical heterostructure. − Specifically, hollow nanostructures can effectively accommodate the volume changes and alleviate the introduced internal strain during lithiation/delithiation. − Porous nanostructures can accelerate the diffusion of lithium ions between electrodes and electrolytes due to their high specific surface area. , Carbon coating and hierarchical heterostructure can effectively improve the electric conductivity of the NiO anode, which is beneficial for improving the initial Coulombic efficiency (ICE). − However, these strategies are usually quite complex and difficult to control for scale-up production. − There is an urgent need to develop a facile method to prepare NiO electrode materials with the ability to alleviate volume changes, provide high conductivity, and realize high specific capacities for energy storage applications. − According to the theoretical calculations, anion doping, such as N 3– , S 2– , Cl – , and F – , can effectively reduce material resistivity and suppress the lattice changes during the cycling process, improving the electrochemical performance of TMOs . Among the above anions, the F ion is argued to be the most adequate anion dopant, considering that F – has a similar ionic radius (133 pm) with that of O 2– (140 pm), which results in lower lattice distortion .…”