title: Electrochemical properties of fiber-in-tube- and filled-structured TiO2 nanofiber anode materials for lithium-ion batteries.
abstract: Phase-pure anatase TiO2 nanofibers with a fiber-in-tube structure were prepared by the electrospinning process. The burning of titanium-oxide-carbon composite nanofibers with a filled structure formed as an intermediate product under an oxygen atmosphere produced carbon-free TiO2 nanofibers with a fiber-in-tube structure. The sizes of the nanofiber core and hollow nanotube were 140 and 500 nm, respectively. The heat treatment of the electrospun nanofibers at 450 and 500 °C under an air atmosphere produced grey and white filled-structured TiO2 nanofibers, respectively. The initial discharge capacities of the TiO2 nanofibers with the fiber-in-tube and filled structures and the commercial TiO2 nanopowders were 231, 134, and 223 mA h g(-1) , respectively, and their corresponding charge capacities were 170, 100, and 169 mA h g(-1) , respectively. The 1000th discharge capacities of the TiO2 nanofibers with the fiber-in-tube and filled structures and the commercial TiO2 nanopowders were 177, 64, and 101 mA h g(-1) , respectively, and their capacity retentions measured from the second cycle were 89, 82, and 52 %, respectively. The TiO2 nanofibers with the fiber-in-tube structure exhibited low charge transfer resistance and structural stability during cycling and better cycling and rate performances than the TiO2 nanofibers with filled structures and the commercial TiO2 nanopowders.
authors.affiliation: Department of Materials Science and Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713 (Republic of Korea), Fax: (+82) 2-928-3584.
authors.forename: Jung Sang
authors.initials: JS
authors.lastname: Cho
authors.affiliation: Department of Materials Science and Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713 (Republic of Korea), Fax: (+82) 2-928-3584.
authors.forename: Young Jun
authors.initials: YJ
authors.lastname: Hong
authors.affiliation: Department of Materials Science and Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713 (Republic of Korea), Fax: (+82) 2-928-3584. yckang@korea.ac.kr.
authors.forename: Yun Chan
authors.initials: YC
authors.lastname: Kang
keywords: energy storage materials; lithium; nanostructures; synthesis design; titanium dioxide