Solid-State Synthesis of Layered MoS2 Nanosheets with Graphene for Sodium-Ion Batteries

Abstract

Sodium-ion batteries have potential as energy-storage devices owing to an abundant source with low cost. However, most electrode materials still suffer from poor conductivity, sluggish kinetics, and huge volume variation. It is still challenging to explore apt electrode materials for sodium-ion battery applications to avoid the pulverization of electrodes induced by reversible intercalation of large sodium ions. Herein, we report a single-step facile, scalable, low-cost, and high-yield approach to prepare a hybrid material; i.e., MoS2 with graphene (MoS2-G). Due to the space-confined effect, thin-layered MoS2 nanosheets with a loose stacking feature are anchored with the graphene sheets. The semienclosed hybrid architecture of the electrode enhances the integrity and stability during the intercalation of Na+ ions. Particularly, during galvanostatic study the assembled Na-ion cell delivered a specific capacity of 420 mAhg−1 at 50 mAg−1, and 172 mAhg−1 at current density 200 mAg−1 after 200 cycles. The MoS2-G hybrid excels in performance due to residual oxygen groups in graphene, which improves the electronic conductivity and decreases the Na+ diffusion barrier during electrochemical reaction, in comparison with a pristine one.

Petroleum-Pitch-Based Carbon Nanocages Encapsulated Few-Layer MoS2 with S Vacancies for a High-Performance Sodium-Ion Battery

“…Additionally, the GCD plots of MoS 2 /C-1-700 at different current densities are displayed in Figure d, which further highlight its rapid Na storage reactions and low polarization potential, even at 5 A g –1 . Moreover, in comparison to many other carbonous MoS 2 anodes reported, MoS 2 /C-1-700 exhibits superior rate performances, as shown in Figure e. − The EIS measurements are also used to evaluate electrical charge behavior, which can further prove the rapid Na + storage of the samples. As shown in Figure f, in comparison to MoS 2 /AC-1-700 and bulk MoS 2 , the charge transfer resistance ( R ct ) of the MoS 2 /C-1-700 composite is approximately 218.2 Ω, smaller than that of MoS 2 /AC-1-700 (338.8 Ω) and MoS 2 (222.4 Ω).…”

Recent Advances in Molybdenum Disulfide and Its Nanocomposites for Energy Applications: Challenges and Development

“…During the galvanostatic study, the assembled Na-ion cell demonstrated a high specific capacity of 420 mAh g −1 at 50 mA g −1 and a capacity retention of 172 mAh g −1 at 200 mA g −1 after undergoing 200 cycles. This study highlights the potential of using hybrid materials in battery applications and demonstrates the importance of optimizing the electrode architecture for improved battery performance [ 166 ]. Halankar et al developed an MoS 2 /C/CNT nanocomposite using a simple hydrothermal method shown in Figure 7 .…”

A strategy for the preparation of super-hydrophilic molybdenum disulfide composites applied to remove uranium from wastewater

“…Due to the long reaction time and complex process of preparing MoS 2 by the hydrothermal method, Cui et al 19 used MoO 3 and S as raw materials to synthesize flower-like molybdenum disulfide by the solidstate method with Ar gas protection. Chothe et al 20 used CS (NH 2 ) 2 and (NH 4 ) 2 MoO 4 as raw materials to synthesize MoS 2 in the solid state by heating at 550 °C under argon for 3 h. Jia et al 21 prepared molybdenum disulfide nanosheets by an ultrasound assisted electrochemical exfoliation method and thermally modified them for the adsorption of Hg 2+ . The adsorption of Hg 2+ by thermally modified molybdenum disulfide was higher than that without thermal treatment.…”

“…21 The existing solid-state synthesis method requires a protective gas atmosphere for reaction, which consumes gas and has low economy. 19,20 Therefore, it is particularly important to find a preparation method that is simple to operate, has high crystallinity, and can be mass-produced. In addition, the hydrophobic properties of MoS 2 itself are rarely considered.…”