SiO₂/TiO₂ Composite Film for High Capacity and Excellent Cycling Stability in Lithium‐Ion Battery Anodes

Abstract

In this study, partially crystalline anodic TiO 2 with SiO 2 well-distributed througout the entire oxide film is prepared using plasma electrolytic oxidation (PEO) to obtain a high-capacity anode with an excellent cycling stability for Li-ion batteries. The micropore sizes in the anodic film become inhomogeneous as the SiO 2 content is increased from 0% to 25%. The X-ray diffraction peaks show that the formed oxide contains the anatase and rutile phases of TiO 2 . In addition, X-ray photoelectron spectroscopy and energy-dispersive X-ray analyses confirm that TiO 2 contains amorphous SiO 2 . Anodic oxides of the SiO 2 /TiO 2 composite prepared by PEO in 0.2 m H 2 SO 4 and 0.4 m Na 2 SiO 3 electrolyte deliver the best performance in Li-ion batteries, exhibiting a capacity of 240 µAh cm −2 at a fairly high current density of 500 µA cm -2 . The composite film shows the typical Li-TiO 2 and Li-SiO 2 redox peaks in the cyclic voltammogram and a corresponding plateau in the galvanostatic charge/discharge curves. The as-prepared SiO 2 /TiO 2 composite anode shows at least twice the capacity of other types of binder-free TiO 2 and TiO 2 composites and very stable cycling stability for more than 250 cycles despite the severe mechanical stress.

Tunable Synthesis of Hierarchical Yolk/Double‐Shelled SiOx@TiO2@C Nanospheres for High‐Performance Lithium‐Ion Batteries

“…[29] According to the result, Si 4 + in STC3 is partially reduced to Si 3 + and Si 2 + ,indicating that carbothermal reduction occurs between SiO 2 and C, which can be attributed to the high-temperature carbonization of RF (at 700 8Cf or 3h). [34][35][36] In Figure 4b,t he three peaks at 532.51, 531.32, and 529.58 eV are consistentw ith the typical binding energies of C=O, SiÀO, and TiÀO, [15] respectively.A s shown in Figure 4c,t wo peaks at 458.88 and 463.98 eV in Ti 2p XPS spectra can be assigned to the binding energies of Ti 2p 3/2 and Ti 2p 1/2 ,r espectively. [33] Figure 4d shows that the [20] The unique structure of the SiO x @TiO 2 @C yolk/double-shelled nanospheresi nspiredu st oe valuate the potential lithium storagep erformance in ab attery testing system.…”

Facile fabrication of TiO 2 /ZnO composite film anode by plasma electrolysis

“…However, the Nyquist plot after cycles shows two obvious semicircles, compared to only one semicircle before cycles. The newly formed semicircle could be explained by the formation of SEI layer during the first cycle, which results in the additional impedance [47]. This is consistent with the significant decrease of R ct from 242.6 Ω to 29.2 Ω before and after cycles.…”

Growth characteristics of scanning micro-arc oxidation coating on Ti6Al4V alloy

“…sodium silicate) during the plasma chemical reaction. Similarly, the occurrence of a large amount of amorphous silica has been reported in other works when the electrolytes contained silicate were utilized in the MAO treatment of titanium alloy [17,[33][34][35].…”