Mesoporous TiO₂‐Sn/C Core‐Shell Nanowire Arrays as High‐Performance 3D Anodes for Li‐Ion Batteries

Abstract

Three‐dimensional mesoporous TiO2‐Sn/C core‐shell nanowire arrays are prepared on Ti foil as anodes for lithium‐ion batteries. Sn formed by a reduction of SnO2 is encapsulated into TiO2 nanowires and the carbon layer is coated onto it. For additive‐free, self‐supported anodes in Li‐ion batteries, this unique core‐shell composite structure can effectively buffer the volume change, suppress cracking, and improve the conductivity of the electrode during the discharge‐charge process, thus resulting in superior rate capability and excellent long‐term cycling stability. Specifically, the TiO2‐Sn/C nanowire arrays display rechargeable discharge capacities of 769, 663, 365, 193, and 90 mA h g−1 at 0.1C, 0.5C, 2C 10C, and 30C, respectively (1C = 335 mA g−1). Furthermore, the TiO2‐Sn/C nanowire arrays exhibit a capacity retention rate of 84.8% with a discharge capacity of over 160 mA h g−1, even after 100 cycles at a high current rate of 10C.

Porous One‐Dimensional Nanomaterials: Design, Fabrication and Applications in Electrochemical Energy Storage

“…Other core/shell nanostructures which have been prepared via a multistep hydrothermal process followed by annealing include mesoporous TiO 2 -Sn/C core-shell nanowires, [119] MnO x /C yolk−shell nanorods, [120] and MnO/C nanopeapods. Other core/shell nanostructures which have been prepared via a multistep hydrothermal process followed by annealing include mesoporous TiO 2 -Sn/C core-shell nanowires, [119] MnO x /C yolk−shell nanorods, [120] and MnO/C nanopeapods.…”

Insights into the conversion behavior of SiO-C hybrid with pre-treated graphite as anodes for Li-ion batteries

“…As observed in Fig. 8, the Nyquist plots of SiO-C and SiO@C composite electrodes depict a semicircle at high frequency and a straight line at low frequency, which correspond to charge transfer and mass transfer of lithium ions, respectively [34]. The equivalent circuit (inset in Fig.…”

Simple Synthesis of TiO2/MnOx Composite with Enhanced Performances as Anode Materials for Li-Ion Battery

“…Although titanium dioxide (TiO2) does not have a high specific capacity, its structural stability leads to great cycling properties [19], and it has been proved that TiO2 can accommodate the volume expansion and maintain the structural integrity of the electrode [20]. In the attempts to improve the properties of MnO2 with TiO2, Liao et al [21] synthesized multifunctional TiO2−C/MnO2 core−double-shell nanowire arrays as high-performance 3D electrodes while Zhou and coworkers [22] explored carbon free core/shell TiO2-MnO2/MnO2.…”