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.
Reduced graphene oxide (RGO)-coated
TiO
2
microcones
have been synthesized via simple anodization and cyclic voltammetry
for use in lithium-ion batteries (LIBs). Microcones had a perpendicularly
oriented hollow core, an anatase structure, and a high surface area,
allowing higher capacity than other nanosized TiO
2
structures.
TiO
2
has low electrical conductivity, leading to the limitation
of fast charging and high capacity; however, this was improved by
the application of an RGO coating in this work. As anode materials
of LIB, the obtained RGO microcone showed a capacity of 157 mAh g
–1
at 10C (fully charged within ∼360 s) and sustained
1000 cycles with only 0.02% capacity fading per cycle. The capacity
was 1.5 times higher than that of conventional microcone. We speculated
that the decrease in the charge-transfer resistance (
R
ct
) played a crucial role in increasing the capacity with
fast charging.
The universe is known as a matter consisting of 99.999% plasma. In article number https://doi.org/10.1002/adfm.201703538, Jinsub Choi and co‐workers prepare plasma in the electrolyte under high voltage conditions, so‐called plasma electrolyte oxidation (PEO). This allows the formation of SiO2‐TiO2 nanocomposites on a Ti substrate, in which SiO2 and TiO2 are designed to contribute to high capacity and excellent cycling stability of Li‐ion batteries, respectively.
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