Boosting Fast Sodium Ion Storage by Synergistic Effect of Heterointerface Engineering and Nitrogen Doping Porous Carbon Nanofibers

Abstract

Sodium-ion batteries (SIBs) are raising more attention due to their low cost and the natural abundance of sodium, which is of great potential applications in largescale energy-storage grids in recent years. [4][5][6][7][8][9][10] Nevertheless, SIBs anodes suffer from sluggish dynamics and structure pulverization issues owing to the larger ionic radius of Na + , leading to poor cycling performance and fast capacity degradation during sodiation/desodiation reaction. [11][12][13][14] Thus, it is urgent to develop the anode electrode for SIBs to realize the ideal Na + sodiation/desodiation and alleviate the strain and stress from the volume changes during charging and discharging.A variety of anode materials have been explored in SIBs, including carbonaceous materials, [15][16][17] alloy materials, [18,19] metal oxides/sulfides, etc. [20][21][22] Among all the materials, metal sulfides (MS x , M = Sn, Sb, Fe, etc.) have been considered as the promising anode candidate with high theoretical specific capacity and abundant resources. [23][24][25][26][27] However, the MS x anode shows inferior electrochemical properties due to the dramatically irreversible volumetric expansion and poor ionic/electronic dynamics. Several attempts have been proposed to solve these problems, including building porous carbon-based MS x composites and designing conventional nanoengineering, which can be an effective improvement to mitigate the volume variation to a certain extent and reduce the ion diffusion distance. [23][24][25][26]28] In spite of these approaches, the MS x composites with a high specific capacity, high rete performance, and stable cycling are still a key and challenging point now.Recently, two-phase MS x composites and heteroatom-doped carbonaceous have been evidenced to exhibit good electrochemical performance. [29][30][31][32][33] For example, Cao et al. reported a hierarchical heterogeneous structure of bimetal sulfide (FeS 2 @Sb 2 S 3 ), which extremely accelerates the electronic/ion transport and effectively alleviates the volume expansion upon long cyclic performance. [31] In addition, they are also coming up with a heterointerface engineering of hierarchical Bi 2 S 3 / MoS 2 , which proves to exert low Na + adsorption energy and fast diffusion kinetics for SIBs due to the charge redistribution at the boundaries of Bi 2 S 3 /MoS 2 . [32] Unfortunately, there are still Heterointerface engineering with multiple electroactive and inactive supporting components is considered an efficient approach to enhance electrochemical performance for sodium-ion batteries (SIBs). Nevertheless, it is still a challenge to rationally design heterointerface engineering and understand the synergistic effect reaction mechanisms. In this paper, the two-phase heterointerface engineering (Sb 2 S 3 and FeS 2 ) is well designed to incorporate into N-doped porous hollow carbon nanofibers (Sb-Fe-S@CNFs) by proper electrospinning design. The obtained Sb-Fe-S@CNFs are used as anode in SIBs to evaluate the electrochemical performance. It delivers a ...

Interface Engineering of Fe7S8/FeS2 Heterostructure in situ Encapsulated into Nitrogen-Doped Carbon Nanotubes for High Power Sodium-Ion Batteries

“…42–1340) [ 40 , 41 ]. Specifically, the diffraction peaks located at around 29.9°, 33.8°, 43.7°, and 53.2° correspond to the (− 2 1 1), (2 2 1), (4 0 2), and (− 6 2 3) planes of monoclinic Fe 7 S 8 , while the diffraction peaks centered at around 33.1°, 37.1°, 40.7°, 47.4° and 56.3° can be ascribed to the (2 0 0), (2 1 0), (2 1 1), (2 2 0) and (3 1 1) planes of cubic FeS 2 , respectively, thereby indicating the successful fabrication of the target heterostructure [ 40 , 41 ]. For comparison, the XRD patterns of Fe 7 S 8 /NCNT and FeS 2 /NCNT can be identified with monoclinic Fe 7 S 8 and cubic FeS 2 , respectively.…”

Anchoring 1T/2H MoS2 nanosheets on carbon nanofibers containing Si nanoparticles as a flexible anode for lithium–ion batteries

“…31 In addition, the D (B1350 cm À1 ) and G (B1585 cm À1 ) bands belonging to the disordered/defective carbon originated from the graphitic sp 3 -hybridization and the E 2g vibratory mode presented in the sp 2 bond of the crystalline graphite basal plane, respectively, which were derived from the PAN nanofibers after carbonization. 32 After zooming in to the area of 50-500 cm À1 of the Raman spectra of the Si@CNFs@1T/2H MoS 2 films, peaks at 149 (J 1 ), 224 (J 2 ), and 336 cm À1 (J 3 ) were revealed, related to the longitudinal acoustic phonon modes of 1T MoS 2 , while the peaks at 284.7, 381.7, and 403.3 cm À1 were associated with the mode of E 1g , E 2g 1 , A 1g of the 2H phase of MoS 2 , respectively, which were weak mainly because the peak of Si was relatively strong. 26,33 The above analysis further proved that the 1T/2H hybrid phases of MoS 2 were successfully obtained.…”

Surface-driven fast sodium storage enabled by Se-doped honeycomb-like macroporous carbon

“…[11][12][13] It has been demonstrated that heteroatoms can supply a large number of Na storage sites through fast pseudo-capacitive reactions, which can simultaneously improve the capacity and rate performance. [14][15][16] Therefore, heteroatom doping has been widely adopted as an effective strategy to construct high-performance carbon anodes.…”