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Citation: DONG Dian-Quan, ZHANG Feng-Bao, ZHANG Guo-Liang, LIU Yi-Fan. Synthesis of Li₄Ti₅O_l2 and Its Exchange Kinetics with Li⁺[J]. Acta Physico-Chimica Sinica, ;2007, 23(06): 950-954. doi: 10.3866/PKU.WHXB20070631 shu

Synthesis of Li₄Ti₅O_l2 and Its Exchange Kinetics with Li⁺

1.

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China; College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, Shandong Province, P. R. China

Received Date: 20 December 2006
Available Online: 27 April 2007

Lithium ion sieve IE-H was obtained by acid-modifying Li4Ti5Ol2 precursor, which was prepared by sol-gel method. Its properties of ion-exchange for Li+ and Na+, such as the saturation capacity of exchange and pH titration curves, were determined. The Li4Ti5Ol2 precursor and lithium ion sieve IE-H were characterized by XRD. The ion exchange mechanism was judged by broken phase contact method. The kinetics of the ion sieve with Li+ was depicted by the shrinking-core model. It was shown that both the Li4Ti5Ol2 and lithium ion sieve IE-H are spinel structure. After acid treatment, the extraction ratio of Li+ from Li4Ti5Ol2 was 19.6%- 81.5%, while the extraction ratio of Ti4+ was less than 4.2%; Further, the obtained ion sieve IE-H showed superior saturated ion exchange capacity for Li+, with a value of 5.95 mmol·g -1. In addition, the reaction of the ion sieve with Li + was determined to be controlled by particle diffusion. Finally, different kinetics equations and diffusion coefficients of the ion sieve IE-H for Li+ at 25 ℃ were obtained with the Li+ concentrations of 20.0 mmol·L-1 and 5.0 mmol·L-1.
- Li4Ti5Ol2; Lithium; Ion sieve; Shrinking-core model; Kinetics
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沈阳化工大学材料科学与工程学院沈阳 110142

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Synthesis of Li4Ti5Ol2 and Its Exchange Kinetics with Li+

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通讯作者: 陈斌, bchen63@163.com

Synthesis of Li₄Ti₅O_l2 and Its Exchange Kinetics with Li⁺