In Situ Carbon-Doped Mo(Se_0.85S_0.15)₂Hierarchical Nanotubes as Stable Anodes for High-Performance Sodium-Ion Batteries

Abstract

Sodium-ion batteries (SIBs) are promising energy storage devices, but suffer from poor cycling stability and low rate capability. In this work, carbon doped Mo(Se0.85 S0.15 )2 (i.e., Mo(Se0.85 S0.15 )2 :C) hierarchical nanotubes have been synthesized for the first time and serve as a robust and high-performance anode material. The hierarchical nanotubes with diameters of 300 nm and wall thicknesses of 50 nm consist of numerous 2D layered nanosheets, and can act as a robust host for sodiation/desodiation cycling. The Mo(Se0.85 S0.15 )2 :C hierarchical nanotubes deliver a discharge capacity of 360 mAh g(-1) at a high current density of 2000 mA g(-1) and keep a 81.8% capacity retention compared to that at a current density of 50 mA g(-1) , showing superior rate capability. Comparing with the second cycle discharge capacities, the nanotube anode can maintain capacities of 102.2%, 101.9%, and 97.8% after 100 cycles at current densities of 200, 500, and 1000 mA g(-1) , respectively. This work demonstrates the best cycling performance and high-rate sodium storage capabilities of MoSe2 for SIBs to date. The hollow interior, hierarchical organization, layered structure, and carbon doping are beneficial for fast Na(+) -ion and electron kinetics and are responsible for the stable cycling performance and high rate capabilities.

Interlayer Nanoarchitectonics of Two‐Dimensional Transition‐Metal Dichalcogenides Nanosheets for Energy Storage and Conversion Applications

“…Comparing with the second cycle discharge capacities, the nanotube anode can maintain capacities of 102.2%, 101.9%, and 97.8% after 100 cycles at current densities of 200, 500, and 1000 mA g −1 , respectively. [118] …”

Nanowire of WP as a High‐Performance Anode Material for Sodium‐Ion Batteries

“…The reversible discharge capacity is found to increase gradually from 190 to 220 mA h g −1 within 200 cycles, whereas WP powder delivers poor capacity 40 mA h g −1 within 100 cycles (Figure S5 b, Supporting Information). A capacity rise with cycling is not uncommon in well‐tailored nanostructures for lithium/sodium storage . As shown in Figure e, under a current density of 2.0 A g −1 , the reversible capacity of WP/CC is still retained at 50 mA h g −1 after 1000 cycles with a high coulombic efficiency of 99 % in subsequent cycles.…”

“…One‐dimensional (1 D) nanostructures such as nanorods, nanotubes, nanowires, and so on have been demonstrated as optimized anodes for SIBs, which can partly reduce the volume effect and shorten the pathway of Na + . In addition, the introduction of a toxic binder and conductive carbon cannot be ignored in the traditional process.…”

“…[12] Miao et al designedaNi 2 P@C/GA3Da rchitecture, whichd isplayed excellent stability with as pecific capacity of 124.5 mA hg À1 at 1Ag À1 over 2000 cycles. [13] One-dimensional (1 D) nanostructures such as nanorods, [11] nanotubes, [14] nanowires, [15,16] and so on have been demonstrateda so ptimized anodesf or SIBs, which can partly reduce the volume effect ands hortent he pathway of Na + .I na ddition, the introduction of at oxic binder and conductive carbon cannot be ignored in the traditional process. This inspired us to design unique nanostructures contacted directly with ac onductive substrate as 3D integrated electrodes.…”

Construction of Nitrogen‐Doped Carbon‐Coated MoSe2 Microspheres with Enhanced Performance for Lithium Storage

“…[10,[18][19][20][21][22] It has been shownt hat the nanostructuring of MoSe 2 can not only provide ah igh surface area with large active sites for Li ion storage, but also facilitatefast ion transfer leading to high active utilization. Currently,t here are several works focused on synthesis of MoSe 2 nanostructures including nanosheets, nanotubes, and microspheres.…”