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J. Korean Ceram. Soc. > Volume 47(6); 2010 > Article
Journal of the Korean Ceramic Society 2010;47(6): 638.
doi: https://doi.org/10.4191/kcers.2010.47.6.638
Study of the Electrochemical Properties of Li4Ti5O12 Doped with Ba and Sr Anodes for Lithium-Ion Secondary Batteries
Byung-Hyun Choi, Dae-Jin Lee, Mi-Jung Ji, Young-Jin Kwon, Sung-Tae Park
Electronic Materials Laboratory, Korea Institute of Ceramic Engineering & Technology
The spinel material $Li_4Ti_5O_{12}$ has attracted considerable attention as an anode electrode material for many battery applications owing to its light weight and high energy density. However, the real capacity of $Li_4Ti_5O_{12}$ powder as determined by the solid-state method is lower than the ideal capacity. In this study, we investigated the effect of the dopants in M-doped spinel $Ba_xLi_{4-2x}Ti_5O_{12}$(x=0.005, 0.05, 0.1) powders prepared by the solid-state reaction method and used as the anode material in lithiumion batteries. The results confirmed the effect of the Ba and Sr dopants on the powder properties of the spinel $Li_4Ti_5O_{12}$, which exhibited a pure spinel structure without any secondary phase in its XRD pattern. Moreover, the electrochemical properties of the spinel M-LTO materials were investigated using a half cell. The electrochemical data show that cells with anodes made of undoped $Li_4Ti_5O_{12}$ and Ba- and Sr-doped $Li_4Ti_5O_{12}$ have discharge capacities of 97, 130, and 112 mAh/g, respectively, at the first cycle. Moreover, the Ba- and Sr-doped spinel $Li_4Ti_5O_{12}$ demonstrated good properties in the mid-voltage range at 1.55 V, showing stable cyclic voltammogram properties which surpassed those of the same material without Ba or Sr at 1 C after 100 cycles.
Key words: Spinel $Li_4Ti_5O_{12}$, Li-ion batteries, Doping
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