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Synthesis by TEA sol–gel method and electrochemical properties of Li4Ti5O12 anode material for lithium-ion battery
Solid State Ionics 176(2005)1201-1206,-0001,():
Anode material Li4Ti5O12 for lithium-ion batteries have been synthesized by a novel sol-gel method with triethanolamine(TEA) as a chelating agent and LiAcd 2H2O and Tetrabutyl titanate [Ti(OC4H9)4] as starting materials. Various initial conditions were studied in order to find the optimal conditions for the synthesis of Li4Ti5O12. The as-prepared samples have been characterized by means of XRD, IR and SEM. Its electrochemical behavior was evaluated in a liquid electrolyte in lithium-ion batteries. These analyses indicated that the prepared Li-Ti-O powders belonged to a spinel structure and had a uniform morphology with average particle size from 223 to 105nm with the increase in TEA content. At 1.55V (vs. Li), the Li4Ti5O12 electrode with the ratio of TEA to Ti ions 0.8 exhibited an initial discharge capacity of 168mA h/g and a subsequent charge capacity of 151mA h/g. The results of cyclic voltammetry for Li4Ti5O12 showed that at the potential range from 1.5 to 1.7V (vs. Li), there was a pair of reversible redox peaks correspond to the process of Li+ intercalation and deintercalation in the spinel Li-Ti-O oxides.
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