TiO2 nanotube arrays annealed in CO exhibiting high performance for lithium ion intercalation
SCIE
SCOPUS
- Title
- TiO2 nanotube arrays annealed in CO exhibiting high performance for lithium ion intercalation
- Authors
- Liu, DW; Zhang, YH; Xiao, P; Garcia, BB; Zhang, QF; Zhou, XY; Jeong, YH; Cao, GZ
- Date Issued
- 2009-11-30
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Abstract
- Anatase titania nanotube arrayswere fabricated by means of anodization of Ti foil and annealed at 400 degrees C in respective CO and N-2 gases for 3 h. Electrochemical impendence spectroscopy study showed that CO annealed arrays possessed a noticeably lower charge-transfer resistance as compared with arrays annealed in N-2 gas under otherwise the same conditions. TiO2 nanotube arrays annealed in CO possessed much improved lithium ion intercalation capacity and rate capability than N-2 annealed samples. At a high charge/discharge current density of 320 mA g(-1), the initial discharge capacity in CO annealed arrays was found to be as high as 223 mAh g(-1), 30% higher than N-2 annealed arrays, similar to 164 mAh g(-1). After 50 charge/discharge cycles, the discharge capacity in CO annealed arrays remained at similar to 179 mAh g(-1). The improved intercalation capacity and rate capability could be attributed to the presence of surface defects like Ti-C species and Ti3+ groups with oxygen vacancies, which not only improved the charge-transfer conductivity of the arrays but also possibly promoted phase transition. (C) 2009 Elsevier Ltd. All rights reserved.
- Keywords
- Li ion intercalation; TiO2 nanotube arrays; CO annealing; Point defects; Charge-transfer; DIOXIDE NANOWALL ARRAYS; ANODE MATERIAL; ELECTROCHEMICAL PROPERTIES; NATURAL GRAPHITE; PARTICLE-SIZE; ANATASE; BATTERIES; CAPACITY; TITANIUM; ELECTRODES
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/26247
- DOI
- 10.1016/J.ELECTACTA.2009.06.090
- ISSN
- 0013-4686
- Article Type
- Article
- Citation
- ELECTROCHIMICA ACTA, vol. 54, no. 27, page. 6816 - 6820, 2009-11-30
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