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- Title
Structure, Stoichiometry, and Electrochemical Performance of Li<sub>2</sub>CoTi<sub>3</sub>O<sub>8</sub> as an Anode Material for Lithium-Ion Batteries.
- Authors
Wang, Jie; Zhao, Hailei; Shen, Yongna; Du, Zhihong; Chen, Xiaomin; Xia, Qing
- Abstract
Li2CoTi3O8 powder has been synthesized by a simple citric nitrate method and was evaluated as an anode material for lithium-ion batteries. The X-ray diffraction (XRD) Rietveld refinement and X-ray photoelectron spectroscopy (XPS) measurements indicate the existence of Ti-site deficiency and a mixed-valence state of Co ions in the Li2CoTi3O8 structure. The refined site-occupation result gave a nonstoichiometric chemical formula of Li2CoTi2.682O8, which corresponds to a theoretical specific capacity of 322 mA h g−1, which is much higher than that of the stoichiometric material (233 mA h g−1). The synthesized Li2CoTi2.682O8 material exhibits high reversible capacity (ca. 320 mA h g−1), and excellent cycling stability and rate capability. A specific capacity of about 240 and 160 mA h g−1 can be achieved at 2 and 6 A g−1, respectively, by the Li2CoTi2.682O8 material. First-principles calculation demonstrates that Ti-site deficiency decreases the bandgap and thus facilitates the electron conduction.
- Subjects
COBALT alloys; ELECTROCHEMICAL analysis; TITANIUM oxides; ANODES; LITHIUM-ion batteries; STOICHIOMETRY; METAL powders; INORGANIC synthesis
- Publication
ChemPlusChem, 2013, Vol 78, Issue 12, p1530
- ISSN
2192-6506
- Publication type
Article
- DOI
10.1002/cplu.201300235