Sol-gel Synthesis and Electrochemical Properties of Spinel Li4Ti5Ol2 for Lithium-Ion BatteriesReport as inadecuate




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Spinel Li4Ti5Ol2 was successfully prepared by sol-gel processing using acetylacetone as chelating ligand, and polyethylene glycol as template.The morphology, phase structure and electrochemical performance of Li4Ti5Ol2 were characterized by X-ray diffractionXRD, scanning electron microscope SEM and charge-discharge tests.It was found that sub-micron pure spinel Li4Ti5Ol2 was obtained upon calcination at temperature of 700℃ over three hours, which exhibits very good cycling life with an initial specific discharge capacity of 169 mAh g-1. When tested at a rate of 0.2C, 0.5C, 1C, and 2C, it still retained a discharge capacity of 164 mAh g-1, 141 mAh g-1, 132 mAh g-1, 110 mAh g-1, respectively, after 50 cycles, indicating that this anode material also has an excellence high-rate performance. The Electrochemical mechanism of li-ion insertion-extraction was also investigated by Cyclic voltammetry CV.

KEYWORDS

spinel Li4Ti5Ol2; anode material; lithium-ion battery; sol-gel processing; polyethylene glycol

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Author: Xiao-ling Zhou, Rui-an Huang, Zhao-cong Wu, Bin Yang, Yong-nian Dai

Source: http://www.scirp.org/



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