Graphene-induced three-dimensional network structure to MoS₂/graphene composite as an excellent anode for sodium ion batteries

Abstract

This paper reports the synthesis MoS2/graphene composite as an anode using commercial graphene as conductive enhancer and structural modifier. X-ray powder diffraction (XRD) and morphology details show that the as-synthesized MoS2/graphene composite has hexagonal structure and shows three-dimensional hierarchical network structure. The anode electrochemical properties of MoS2/graphene composite and pure MoS2 were measured and analyzed by galvanostatic charge–discharge cycling vs. Na/Na+ at different current densities in 0.05–3.0[Formula: see text]V. Compared to pure MoS2, MoS2/graphene composite demonstrates great specific capacity (509[Formula: see text]mAh[Formula: see text] at the current rate about 0.3 C), excellent rate capability (305[Formula: see text]mAh[Formula: see text] at the maximum current rate 5 C) and relatively good cycle-life (capacity reached 84% after 100 cycles). Moreover, the facile synthesis strategy of MoS2/graphene can provide a reference for designing other transition metal chalcogenides composites containing graphene for high performance SIBs.

Molybdenum‐based materials for sodium‐ion batteries

“…Nonetheless, the MoS 2 nanostructures still experience a significant capacity decay, due most possibly to the dissolution of polysulfide species upon Na cycling. To mitigate this issue, several strategies such as strong coupling 75,76 and surface coating 77 have been proposed. Nanocarbon coupling not only offers a conductive percolation but also strongly holds polysulfide species by chemical bonds 53,55,78 .…”

Electrochemically Anodized V2O5 as an Efficient Sodium Cathode

“…However, structural instability and slow reaction kinetics are critical challenges that need to be resolved before practical application. Designing nanostructured electrode materials can effectively solve these challenges because nanomaterials feature an increased accessible area of the electrode, reduced ion transport pathway, and better accommodation of strains. − In this sense, numerous V 2 O 5 nanostructures, such as nanowires, nanorods, nanosheets, and nanospheres, have been actively engineered, which exhibited improved performance for battery applications. For instance, Rui et al have successfully synthesized single-crystalline V 2 O 5 nanobelts, which have highly conductive channels for electron mobility during reactions .…”