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Characterization of mixed titanium-niobium oxide Ti2Nb10O29 annealed in vacuum as anode material for lithium-ion battery 高島, 俊生 東城, 友都 稲田, 亮史 櫻井, 庸司 Takashima, Toshiki Tojo, Tomohiro Inada, Ryoji Sakurai, Yoji Copyright © 2014 Elsevier B.V. All rights reserved Ti2Nb10O29 Lithium-ion battery Anode material Oxygen defect Electronic conductivity In this paper, the properties of mixed titanium-niobium oxide Ti2Nb10O29 (TNO) annealed in air and vacuum as anode material for lithium-ion battery were investigated. The color of TNO annealed in vacuum (V-TNO) is dark blue while white for TNO annealed in air (A-TNO). Moreover, lattice parameters for V-TNO were confirmed to be slightly larger than those for A-TNO. Introduction of oxygen defect in V-TNO was confirmed by thermogravimetric analysis. X-ray photoelectron spectroscopy analysis also indicated that Ti4+ in V-TNO are partially reduced into Ti3+, due to the introduction of oxygen defect in V-TNO. Electronic conductivity at room temperature for uni-axially pressed V-TNO powder is estimated to be around 10-610-5 S cm-1, which is more than three digits higher than that for pressed A-TNO powder (= 10-9 S cm-1). The enhancement of intrinsic electronic conductivity of TNO greatly contributes for improving the rate performance. At low current density of 0.5 mA cm-2, both A-TNO and V-TNO showed reversible capacity around 250 mAh g-1 at potential range from 1.0 to 2.5 V vs. Li/Li+, while at higher current density of 10 mA cm-2, V-TNO maintained much higher discharge capacity of 150 mAh g-1 than that for TNO (= 50 mAh g-1). Elsevier 2015-02 eng journal article AM https://repo.lib.tut.ac.jp/records/1575 10.1016/j.jpowsour.2014.11.109 http://www.sciencedirect.com/science/article/pii/S0378775314019661 ScienceDirect Journal of Power Sources 276 113 119 https://repo.lib.tut.ac.jp/record/1575/files/j03787753-0276-113.pdf application/pdf 5.8 MB 2014-12-10