MoS2/C/C nanofiber with double-layer carbon coating for high cycling stability and rate capability in lithium-ion batteries

Abstract

MoS 2 has attracted a lot of interest in the field of lithium-ion storage as an anode material owing to its high capacity and two-dimensional (2D)-layer structure. However, its electrochemical properties, such as rate capability and cycling stability, are usually limited by its low conductivity, volume variation, and polysulfide dissolution during lithiation/delithiation cycling. Here, a designed two-layer carbon-coated MoS 2 /carbon nanofiber (MoS 2 /C/C fiber) hybrid electrode with a double-layer carbon coating was achieved by a facile hydrothermal and subsequent electrospinning method. The double carbon layer (inner amorphous carbon and outer carbon fiber) shells could efficiently increase the electron conductivity, prevent the aggregation of MoS 2 flakes, and limit the volume change and polysulfide loss during long-term cycling. The as-prepared MoS 2 /C/C fiber electrode exhibited a high capacity of up to 1,275 mAh/g at a current density of 0.2 A/g, 85.0% first cycle Coulombic efficiency, and significantly increased rate capability and cycling stability. These results demonstrate the potential applications of MoS 2 /C/C fiber hybrid material for energy storage and may open up a new avenue for improving electrode energy storage performance by fabricating hybrid nanofiber electrode materials with double-layer carbon coatings.

3D Crumpled Ultrathin 1T MoS2 for Inkjet Printing of Mg-Ion Asymmetric Micro-supercapacitors

“…As a promising TMD for energy storage devices, 24 − 26 1T metallic molybdenum disulfide (MoS 2 ) has been investigated extensively due to its unique layered structure, good electrochemical performance, and the earth abundance of bulk MoS 2 as a mineral. 27 − 29 Typically, the 1T phase exhibits significantly enhanced hydrophilicity and an electrical conductivity at least 5 orders of magnitude higher than that of 2H-MoS 2 , which result in an extreme high volumetric capacitance of ∼700 F cm –3 in an aqueous electrolyte. 24 Thus, 1T MoS 2 could be an ideal material to fabricate high-performance MSCs.…”

Self-Assembled Few-Layered MoS2 on SnO2 Anode for Enhancing Lithium-Ion Storage

“…First, it is easily observed that the oxidation peaks remain stable, with two peaks at 0.67 and 1.30 V related to the reversible reduction and oxidation reaction of Sn metal. With the M1SnO 2 electrode, additional peaks appeared at ~0.42 V and 0.45 V, arising from the conversion reaction as: Li x MoS 2 + (4 − x ) Li + + (4 − x ) e − → Mo + 2 Li 2 S and from SEI layer formation on the MoS 2 materials [ 46 , 47 , 48 , 49 ]. The M2/M3SnO 2 electrodes also have peaks at ~0.42 V; however, the intensities are weaker than that of the M1SnO 2 electrode.…”

N-doped hard/soft double-carbon-coated Na3V2(PO4)3 hybrid-porous microspheres with pseudocapacitive behaviour for ultrahigh power sodium-ion batteries

“…Therefore, many attempts have been made to enhance the electrochemical properties, including metal doping [28,29], various carbon coating [30][31][32][33] and reducing the particles size [34,35]. Among these strategies, N-doped carbon coating [36][37][38][39] and double-carbon coating [40][41][42] have been regarded as the most facile and effective routes to enhance the electrochemical property for NVP. Our works have also demonstrated that hard carbon nanospheres and soft carbon material represent the most promising electrodes for SIBs due to its high storage capacity and cycling stability [43][44][45][46].…”