Anatase Titania Nanorods as an Intercalation Anode Material for Rechargeable Sodium Batteries

Anatase Titania Nanorods as an Intercalation Anode Material for Rechargeable Sodium Batteries
김기태굴람 알리정경윤윤종승Hitoshi Yashiro선양국Jun LuKhalil Amine명승택
Natase TiO2; nanorods; carbon coating; intercalation; anode; sodium battery
Issue Date
Nano letters
VOL 14, NO 2, 416-422
For the first time, we report the electrochemical activity of anatase TiO2 nanorods in a Na cell. The anatase TiO2 nanorods were synthesized by a hydrothermal method, and their surfaces were coated by carbon to improve the electric conductivity through carbonization of pitch at 700 °C for 2 h in Ar flow. The resulting structure does not change before and after the carbon coating, as confirmed by X-ray diffraction (XRD). Transmission electron microscopic images confirm the presence of a carbon coating on the anatase TiO2 nanorods. In cell tests, anodes of bare and carboncoated anatase TiO2 nanorods exhibit stable cycling performance and attain a capacity of about 172 and 193 mAh g−1 on the first charge, respectively, in the voltage range of 3−0 V. With the help of the conductive carbon layers, the carbon-coated anatase TiO2 delivers more capacity at high rates, 104 mAh g−1 at the 10 C-rate (3.3 A g−1), 82 mAh g−1 at the 30 C-rate (10 A g−1), and 53 mAh g−1 at the 100 C-rate (33 A g−1). By contrast, the anode of bare anatase TiO2 nanorods delivers only about 38 mAh g−1 at the 10 C-rate (3.3 A g−1). The excellent cyclability and high-rate capability are the result of a Na+ insertion and extraction reaction into the host structure coupled with Ti4+/3+ redox reaction, as revealed by Xray absorption spectroscopy.
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