Anatase Titania Nanorods as an Intercalation Anode Material for Rechargeable Sodium Batteries
- Anatase Titania Nanorods as an Intercalation Anode Material for Rechargeable Sodium Batteries
- 김기태; 굴람 알리; 정경윤; 윤종승; Hitoshi Yashiro; 선양국; Jun Lu; Khalil Amine; 명승택
- 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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