Multidimensional Synergistic Nanoarchitecture Exhibiting Highly Stable and Ultrafast Sodium‐Ion Storage

Abstract

Conversion-type anodes with multielectron reactions are beneficial for achieving a high capacity in sodium-ion batteries. Enhancing the electron/ion conductivity and structural stability are two key challenges in the development of high-performance sodium storage. Herein, a novel multidimensionally assembled nanoarchitecture is presented, which consists of V O nanoparticles embedded in amorphous carbon nanotubes that are then coassembled within a reduced graphene oxide (rGO) network, this materials is denoted V O ⊂C-NTs⊂rGO. The selective insertion and multiphase conversion mechanism of V O in sodium-ion storage is systematically demonstrated for the first time. Importantly, the naturally integrated advantages of each subunit synergistically provide a robust structure and rapid electron/ion transport, as confirmed by in situ and ex situ transmission electron microscopy experiments and kinetic analysis. Benefiting from the synergistic effects, the V O ⊂C-NTs⊂rGO anode delivers an ultralong cycle life (72.3% at 5 A g after 15 000 cycles) and an ultrahigh rate capability (165 mAh g at 20 A g , ≈30 s per charge/discharge). The synergistic design of the multidimensionally assembled nanoarchitecture produces superior advantages in energy storage.

Exposing {010} Active Facets by Multiple‐Layer Oriented Stacking Nanosheets for High‐Performance Capacitive Sodium‐Ion Oxide Cathode

“…Besides, the incorporation of Li and Mg into the transition metal layer can improve the structural stability and obtain better electrochemical performance . Some pioneers have confirmed that reasonable geometrical structure is also of great importance to improve Na + kinetics . In this case, an optimal bifunctional modulation combining the advantages of chemical substitution and structure design might realize both excellent rate capability and long cycle stability.…”

Pseudocapacitive Graphene‐Wrapped Porous VO2 Microspheres for Ultrastable and Ultrahigh‐Rate Sodium‐Ion Storage

“…[19][20][21][22][23] Amongst, most works have focused on the oxides of Fe, Co and Ni and achieved good results. [28][29][30][31][32] Especially, the monoclinic VO 2 , which has a bilayer structure with large lattice spacing and high capacity has been widely investigated. [28][29][30][31][32] Especially, the monoclinic VO 2 , which has a bilayer structure with large lattice spacing and high capacity has been widely investigated.…”

“…[24][25][26][27] Indeed, other materials like the vanadium oxides are also promising anode materials because of their low cost, high theoretical capacity and the abundant supply of vanadium resource. [28][29][30][31][32] Especially, the monoclinic VO 2 , which has a bilayer structure with large lattice spacing and high capacity has been widely investigated. [13,31,33] Manthiram et al demonstrated a one-step microwave-assisted solvothermal method to prepare one-dimensional VO 2 /rGO nanorod.…”

Polyol Solvation Effect on Tuning the Universal Growth of Binary Metal Oxide Nanodots@Graphene Oxide Heterostructures for Electrochemical Applications

“…Binary traditional metal oxide nanodots (BMO NDs, diameter: 2–20 nm) show merits for catalysis, supercapacitors, lithium‐ion batteries (LIBs) in terms of the more active sites, superior conductivity, shortened ion diffusion distance and high surface area . However, the high surface area of BMO NDs aggravates self‐aggregation, leading to the loss of active sites and the increase in interface charge transfer resistance . Graphene oxide (GO), as a two‐dimensional (2D) substrate, is employed to anchor zero‐dimensional (0D) BMO NDs to prevent the self‐aggregation and increase electron conduction, largely improving their electrochemical performance .…”

“…[1] However,t he high surfacea rea of BMO NDs aggravates self-aggregation, leadingt ot he loss of active sites and the increase in interface charget ransfer resistance. [2] Grapheneo xide (GO), as at wo-dimensional (2D) substrate, is employed to anchorz ero-dimensional( 0D) BMON Ds to prevent the self-aggregation and increase electron conduction, largely improving their electrochemical performance. [3] Dependingo nt he electrostatic adsorption between metal cations and the surface functional groups( hydroxyl and carboxyl) of GO, [4] and subsequent nucleation and growth processes, [5] various wet-chemistry methods, including immersion-annealing, water bath, hydrothermal/solvothermal, were used to synthesize the monometallico xide NDs@GO (e.g.,C oO, [6] SnO 2 , [3b] Fe 2 O 3 , [7] TiO 2 / SnO 2 , [8] FeOOH, [9] and so forth) and cation-type BMO NDs@GO, (e.g.,M nFe 2 O 4 , [10] ZnCo 2 O 4 , [11] CoFe 2 O 4 , [12] and so forth).…”