1986/12/10 by Kang Xu, Juan Xie, Huilong Dong +9 · 2 citations
Materials Science · Environmental Science · Engineering · #Material Properties and Applications #Environmental and Industrial Safety #Field-Flow Fractionation Techniques
paper · doi:10.1016/j.jcis.2023.11.105
For the continued use of sodium-ion batteries (SIBs), which require matching anode materials, it is crucial to create high energy density energy storage devices. Here, hollow nanoboxes shaped carbon supported sulfur-doped MoSe<sub>2</sub> nanosheets (S-MoSe<sub>2</sub>@NC) are fabricated by in situ growth and heterodoping strategy. This ensures that the MoSe<sub>2</sub> nanosheets are tightly anchored to the nanoboxes carbon, and the structure can effectively buffer the volume stress caused by sodium ion (de)intercalation, as well as providing abundant ion/electron migration transportations. As anode for SIBs, the S-MoSe<sub>2</sub>@NC shows a higher rate capability and excellent cycling stability (431.1 mAh/g after 1100 cycles at 10 A/g). This excellent cycle life and high rate ability are due to the structural stability and outstanding electronic conductance with reduced band gap of the S-MoSe<sub>2</sub>@NC, as evidenced by the diffusion analysis and theoretical calculation. In order to promote the application of SIBs, the S-MoSe<sub>2</sub>@NC and NaNi<sub>1/3</sub>Fe<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> were assembled into a pouch cell, and the test found that besides the excellent cycle rate performance, the ultrahigh energy density of 256 Wh kg<sup>-1</sup> and flexible characteristics can be achieved. This study has proven that building a structure with a rock-steady foundation and quick ion migration may efficiently control sodium storage and pave the way for novel applications of high-performance transition metal dichalcogenides in sodium storage.