Hierarchical MoSe₂ Nanosheets/Reduced Graphene Oxide Composites as Anodes for Lithium‐Ion and Sodium‐Ion Batteries with Enhanced Electrochemical Performance

Abstract

The preparation and electrochemical storage behavior of hierarchical MoSe 2 /reduced graphene oxide (rGO) composites were studied. The preparation was achieved by af acile hydrothermal route. The resultss how that MoSe 2 has ah ighc apacity for lithium ion ands odium ion storagea nd that the incorporation of rGO has further improved the electrochemical property of MoSe 2 effectively.A sa node materials for lithium-ion and sodium-ion batteries, the MoSe 2 /rGO composites demonstrate excellent rate performance andc ycling stability of 917 mA hg À1 after 100 cycles for Li + storage and 430 mA hg À1 after 200 cycles for Na + storage at ac urrent density of 0.5 Ag À1 ,w hich is attributed to the robust hierarchical structure and the synergistic effectsb etween MoSe 2 nanosheets andrGO. Therefore, the electrochemical evaluations suggest that the obtained hierarchical structure MoSe 2 / rGO composites hold great potential as anode materials for lithium-ion ands odium-ion batteries.Considerable attention has focusedo nf undamentalr esearch and technological applications of layered transition metal dichalcogenides (TMDs)d ue to their unique crystal structures and varieties of materialp roperties.[1] In TMDs, the metals and chalcogens which are bonded by strong covalent bonding form the molecular layers,a nd the individual layersa re further stacked together via weak van der Waals interactions. The unique graphene-like layered structures, which allow for the insertion and extractiono favariety of guest speciesb etween the layers, give TMDs significant advantages in the field of reversible energy storage, especially in lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs).[2] In addition, the relatively low operation voltage and high theoretical capacities of TMDs also give them potentiala se lectrode materials in LIBs and SIBs.

Hierarchical MoS2@RGO nanosheets for high performance sodium storage

“…Raising the proportion of graphene in the composite is beneficial for the enhanced conductivity but unfavorable for the battery energy density. It was confirmed that constructing ultrathin MoS 2 nanosheets perpendicular to carbonaceous materials could solve the contradictory problem [32]. In this structure, the MoS 2 nanosheets are vertically aligned on the carbonaceous materials, and the randomly assembled MoS 2 nanosheets interconnect into 3D hierarchical structures.…”

Advancement in Layered Transition Metal Dichalcogenide Composites for Lithium and Sodium Ion Batteries

“…Incorporation of graphene with L-TMD NSs can enhance the electrochemical performance of L-TMD by improving the (i) electrochemical surface area; (ii) electrode/electrolyte interface; (iii) inherent conductivity by providing pathways for electronic conduction; (iv) ease of mass diffusion, etc. Surfactant assisted hydrothermal/wet chemical method is the most common approach for the preparation of single-or multi-layered L-MoX 2 (X = S, Se)-graphene composites [47,[54][55][56][57][58][59][60] [57,58]. The use of surfactant helps to control the morphology of the resulting product, which in turn results in a better control of the performance of the hybrid materials.…”

Construction of Nitrogen‐Doped Carbon‐Coated MoSe2 Microspheres with Enhanced Performance for Lithium Storage

“…[7][8][9][10][11][12] Among these available TMDs, MoSe 2 has been considered as one of the most promising anode materials for lithium/sodium storage because of higher electrochemical activity and larger capacity as compared with commercial graphite anode. [13][14][15][16][17] Nevertheless, MoSe 2 still suffers from inferiore lectrochemical performance owing to its low conductivity and easily stacking problem, as well as the "shuttle effect" of intermediate polyselenides during the lithiumstoragep rocess.…”