Stable 1T-MoSe₂ and Carbon Nanotube Hybridized Flexible Film: Binder-Free and High-Performance Li-Ion Anode

Abstract

Two-dimensional stable metallic 1T-MoSe with expanded interlayer spacing of 10.0 Å in situ grown on SWCNTs film is fabricated via a one-step solvothermal method. Combined with X-ray absorption near-edge structures, our characterization reveals that such 1T-MoSe and single-walled carbon nanotubes (abbreviated as 1T-MoSe/SWCNTs) hybridized structure can provide strong electrical and chemical coupling between 1T-MoSe nanosheets and SWCNT film in a form of C-O-Mo bonding, which significantly benefits a high-efficiency electron/ion transport pathway and structural stability, thus directly enabling high-performance lithium storage properties. In particular, as a flexible and binder-free Li-ion anode, the 1T-MoSe/SWCNTs electrode exhibits excellent rate capacity, which delivers a capacity of 630 mAh/g at 3000 mA/g. Meanwhile, the strong C-O-Mo bonding of 1T-MoSe/SWCNTs accommodates volume alteration during the repeated charge/discharge process, which gives rise to 89% capacity retention and a capacity of 971 mAh/g at 300 mA/g after 100 cycles. This synthetic route of a multifunctional MoSe/SWCNTs hybrid might be extended to fabricate other 2D layer-based flexible and light electrodes for various applications such as electronics, optics, and catalysts.

α‐Fe2O3 Nanoparticles Decorated C@MoS2 Nanosheet Arrays with Expanded Spacing of (002) Plane for Ultrafast and High Li/Na‐Ion Storage

“…Since Fe 2 O 3 @C@MoS 2 nanosheet arrays on the CFC are ultrathin (≈300 nm in thickness; Figure S2b, Supporting Information) relative to the carbon fiber (≈10 µm in thickness; Figure S1, Supporting Information), the peak intensities of Mo 3d, S 2p, and Fe 2p are much lower than that of C. Figure b shows the high‐resolution spectrum of Mo 3d, and the peaks at 229.34 and 232.59 eV are corresponding to the Mo 3d 5/2 and Mo 3d 3/2 of Mo 4+ in MoS 2 , respectively . The peak at 235.80 eV is the 3d 3/2 of Mo 6+ , and this is attributed to the formation of MoOC bonds between the carbon fibers and MoS 2 arrays . The existence of these bonds indicates the limited bonding of MoS 2 nanosheets and the carbon fiber, which is critical for high‐performance electrode materials.…”

Interfacial Bonding of Metal‐Sulfides with Double Carbon for Improving Reversibility of Advanced Alkali‐Ion Batteries

“…[ 6 ] Alternatively, by building interfacial chemical bonds, the strong coupling interaction could be wonderfully obtained, which displayed the visible improvement of ion‐diffusion kinetic, thermal stability, as well as structural strength stability. [ 7 ] Based on the previous work, series of chemical bonds have been successfully constructed, such as SnC, SnNC, SbOC, TiNC, CoOC, MoOC, and so on, markedly enhancing the electrochemical properties. [ 8 ] For instances, through the cation‐exchange strategy, the SnSe@N‐doped carbon with SnC bonds were prepared, meaningfully verifying that the existing SnC rendered the lowering of ion‐diffusion and energy barriers, where its capacity would be kept about 300 mAh g −1 at 2.0 A g −1 .…”

Excellent Rate and Low Temperature Performance of Lithium‐Ion Batteries based on Binder‐Free Li4Ti5O12 Electrode

“…[28,29] Secondly, some binder-free electrodes still rely on substrates, including metal substrate, carbon nanotubes, carbon paper or other flexible materials. [30][31][32][33] Thirdly, templates, spark plasma sintering approach and powder extrusion moulding technology can be helpful to obtain the monolithic or ceramic electrodes without binders. [34][35][36] In conclusion, reducing the mass of non-active component in the electrode is conducive to improving the energy density of the LIBs, which is very important for the further application.…”