MoS₂ Nanoflowers with Expanded Interlayers as High‐Performance Anodes for Sodium‐Ion Batteries

Abstract

MoS 2 nanoflowers with expanded interlayer spacing of the (002) plane were synthesized and used as highperformance anode in Na-ion batteries. By controlling the cut-off voltage to the range of 0.4-3 V, an intercalation mechanism rather than a conversion reaction is taking place.The MoS 2 nanoflower electrode shows high discharge capacities of 350 mAh g À1 at 0.05 A g À1 , 300 mAh g À1 at 1 A g À1 , and 195 mAh g À1 at 10 A g À1 . An initial capacity increase with cycling is caused by peeling off MoS 2 layers, which produces more active sites for Na + storage. The stripping of MoS 2 layers occurring in charge/discharge cycling contributes to the enhanced kinetics and low energy barrier for the intercalation of Na + ions. The electrochemical reaction is mainly controlled by the capacitive process, which facilitates the high-rate capability. Therefore, MoS 2 nanoflowers with expanded interlayers hold promise for rechargeable Na-ion batteries.

In situ X-ray diffraction characterization of NbS2 nanosheets as the anode material for sodium ion batteries

“…These results are consistent with the cyclic performance and rate performance, clearly demonstrating that the exfoliation can decrease charge transfer resistance. As it is reported in the literature, a high specific capacity and rate performance can be expected by employing ultrathin (1e5 single layers) NbS 2 nanosheets [21,27], as it can further shorten the Na þ ions diffraction distance, or mixing the NbS 2 nanosheets with carbonaceous materials (e.g. reduced grapheme oxide (rGO) and carbon et al), which can fast collection and conduction of electrons, and lower the anode reaction kinetics [36e38].…”

“…However, the lithiation or sodiation process might induce a phase transition of the TMDs over cycling, and which consequently cause the fast degradation of their electrochemical performance [21,26,27]. Therefore, whether the certain material showing structural change upon soidation/desodiation is one of the major factors that should be considered for SIBs anode selection.…”

In Situ Carbon-Doped Mo(Se0.85S0.15)2Hierarchical Nanotubes as Stable Anodes for High-Performance Sodium-Ion Batteries

“…[30][31][32][33][34][35][36][37][38][39][40][41][42][43] Many recent studies focusing on molybdenum disulfi de (MoS 2 ) reveal that the layered structure benefi ts for initial ion intercalation/extraction, and the subsequent conversion chemistry enables high theoretical capacity. [ 31,36 ] Similar to MoS 2 with a sandwich structure, MoSe 2 is composed of stacked atom layers (Se-Mo-Se) [ 44 ] with a theoretical specifi c capacity as high as 422 mAh g −1 , [ 43 ] according to the reaction between one MoSe 2 molecule and four Na + ions. MoSe 2 shows a larger space between adjacent layers and a smaller bandgap than those of MoS 2 , [ 45 ] which are expected to contribute to better electronic conductivity and smaller structure resistance for Na + ion intercalation.…”

Edge Engineering of MoS2 Nanoribbons as High Performance Electrode Material for Na‐ion Battery: A First‐Principle Study

“…[18][19][20][21][22][23] The other is to expand the interlayer spacing to accommodate more Na as well as facilitate fast diffusion path of Na. [24][25][26][27] Jung et al [28] prepared a series of MoS 2 plates with various lateral lengths, number of layers and interlayer spacings, demonstrating that the size effect plays a key role in battery performance.…”