Enhanced Electrochemical Properties of Size-Controlled TiO2 Nanowire Electrodes for Lithium-Ion Batteries

초록

Size-controlled single-crystalline TiO2 nanowires (TNW-3, TNW-6, TNW-9, TNW-12, and TNW-24) have been successfully synthesized by hydrothermal process without any surfactant and template as a fucntion of reaction time such as 3, 6, 9, 12, and 24 h, respectively. The single-crystalline TNWs are dominantly exposed to the (110) plane and grown to the one-dimensional structure along the [001] axis exhibiting the single-crystalline nature. The average lengths of the TNW-3, TNW-6, TNW-9, TNW-12, and TNW-24 are similar to 11.0, similar to 16.5, similar to 37.6, similar to 80.7, and similar to 129.8 nm, respectively, with almost the same diameter of similar to 9.0 nm. The 1st capacities of the TNW-3, TNW-6, TNW-9, TNW-12, and TNW-24 are 138.7, 147.2, 163.2, 181.7, and 185.7 mAh g(-1), respectively, representing that the capacity of TNWs increases with increasing reation time. At high current rates such as 5, 10, and 20 C, the TNWs can display an excellent high-rate performance. The improved lithium-ion intercalation properties of the TNWs at high current rates may be attributed to relatively improved charge transport in the optimized 1-D nanostructure.

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