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Updated: Dec 30, 2025

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Structure, Stoichiometry, and Electrochemical Performance of Li2 CoTi3 O8 as an Anode Material for Lithium-Ion
Jie Wang1, Hailei Zhao1,2, Yongna Shen1
1School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (P.R. China), Fax: (+86) 10-82376837.
Abstract:
Li2 CoTi3 O8 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 Li2 CoTi3 O8 structure. The refined site-occupation result gave a nonstoichiometric chemical formula of Li2 CoTi2.682 O8 , 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 Li2 CoTi2.682 O8 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 Li2 CoTi2.682 O8 material. First-principles calculation demonstrates that Ti-site deficiency decreases the bandgap and thus facilitates the electron conduction.
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