2015年4月
Nb-Doped Rutile TiO2: a Potential Anode Material for Na-Ion Battery
ACS APPLIED MATERIALS & INTERFACES
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- 巻
- 7
- 号
- 12
- 開始ページ
- 6567
- 終了ページ
- 6573
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/am508670z
- 出版者・発行元
- AMER CHEMICAL SOC
The electrochemical properties of the rutile-type TiO2 and Nb-doped TiO2 were investigated for the first time as Na-ion battery anodes. Ti1-xNbxO2 thick-film electrodes without a binder and a conductive additive were prepared using a sol-gel method followed by a gas-deposition method. The TiO2 electrode showed reversible reactions of Na insertion/extraction accompanied by expansion/contraction of the TiO2 lattice. Among the Ti1-xNbxO2 electrodes with x = 0-0.18, the Ti0.94Nb0.06O2 electrode exhibited the best cycling performance, with a reversible capacity of 160 mA h g(-1) at the 50th cycle. As the Li-ion battery anode, this electrode also attained an excellent rate capability, with a capacity of 120 mA h g(-1) even at the high current density of 16.75 A g(-1) (50C). The improvements in the performances are attributed to a 3 orders of magnitude higher electronic conductivity of Ti0.94Nb0.06O2 compared to that of TiO2. This offers the possibility of Nb-doped rutile TiO2 as a Na-ion battery anode as well as a Li-ion battery anode.
- リンク情報
- ID情報
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- DOI : 10.1021/am508670z
- ISSN : 1944-8244
- Web of Science ID : WOS:000352246700026