Journal
SOLID STATE IONICS
Volume 178, Issue 33-34, Pages 1725-1730Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2007.11.004
Keywords
Li2Ti3O7; ion exchange; Rietveld analysis; layered structure; Li-ion intercalation
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Li2Ti3O7 with the Na2Ti3O7-type layered structure was prepared from Na2Ti3O7 as a parent compound via ion exchange in molten LiNO3/LiCl at 260-280 degrees C. The layered crystal structure of Li2Ti3O7 was determined by Rietveld analysis using the X-ray powder diffraction data. The interlayer distance in Li2Ti3O7 was considerably shorter than that in the parent Na2Ti3O7. The two types of Li atoms were tetrahedrally coordinated by the surrounding oxygen atoms in the interlayer space. The electrochemical measurements showed the reversible Li-ion intercalation and deintercalation reactions in a voltage range of 1.5-2.0 V (vs. Li/Li+), respectively. The initial Li-ion intercalation capacity of the present Li2Ti3O7 sample was 147 mAh g(-1); this value is equivalent to 1.48 electron transfers per formula unit. (C) 2007 Elsevier B.V. All rights reserved.
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