Ultrathin MoS₂/Nitrogen‐Doped Graphene Nanosheets with Highly Reversible Lithium Storage

Abstract

Ultrathin MoS2/N‐graphene nanosheets with ≈4 nm thickness exhibit exceptional electrochemical performance. Extension of the defect sites and vacancies of the nanosheets results in the increase of capacity during cycling.

Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

“…MoS 2 /graphene composites prepared by different routes show high reversible capacity with good capacity retention [150][151][152][153]. As shown in figure 12a-c, replacing graphene with N-doped graphene in MoS 2 /graphene composites further improves the capacity and retention [154]. Increasing vacancies and defects in N-doped graphene appears to promote more Li-ion insertion leading to the observed 01 Hz.…”

“…increase in capacity with an increasing number of cycles (figure 12a) [154]. WS 2 /graphene composites also showed improved properties such as high specific capacity at high current densities and good capacity-retention compared with the bare WS 2 [155].…”

“…Z w denoted Warburg impedance corresponding to the lithium diffusion process. Adapted with permission from Chang et al [154].…”

MoS2-coated vertical graphene nanosheet for high-performance rechargeable lithium-ion batteries and hydrogen production

“…These capacities were also notably higher than the theoretical value of MoS 2 calculated based on the conversion reaction, which may be due to the extra capacity contribution from the massive active sites that can accommodate additional Li ions by the vacancies, dislocations and distortions of MoS 2 nanostructures and VGNS backbones as pores, cavities or defect sites. 36 Nevertheless, further studies will be necessary to understand whether other mechanisms (for example, interfacial storage and electrolyte decomposition) also contributed to the electrochemical charge storage. 11 The rate capability of MoS 2 /VGNS nanostructures grown with various Mo salt precursors is shown in Figure 3c and Supplementary Figure S8a.…”

Promotion of reversible Li+ storage in transition metal dichalcogenides by Ag nanoclusters

“…10,11 MoS 2 /graphene composites with different layer thicknesses could be formed by hydrothermal synthesis or reflux methods. [17][18][19][20] The composites with better performance can deliver a capacity of 1000-1200 mAh g − 1 at 0.1 A g − 1 and~700-800 mAh g − 1 at 1 A g − 1 . After years of development, the improvement of the electrochemical performance of MoS 2 through structural modifications has probably reached its limits.…”