Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 569, Issue -, Pages 76-81Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.03.188
Keywords
Lithium battery; Cathode materials; Lithium vanadium phosphate; In situ XRD; In situ XAS
Categories
Funding
- Ministry of Knowledge Economy [2010T100200295]
- National Research Foundation
- Korean Government [MEST: NRF- 2010-0029065, R31-2008-10029]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10037920] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2010-0029072, 2013-PAL] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Monoclinic Li3V2(PO4)(3), is a highly promising cathode material for lithium-ion rechargeable batteries. It has good ion mobility and high lithium capacity due to its ability to reversibly extract all three lithium ions. Here, we present, a systematic investigation of phase transitions and volume variations that occur during lithium extraction from the carbon-coated monoclinic phase of Li3V2(PO4)(3) by synchrotron based in situ X-ray diffraction and X-ray absorption spectroscopy. This monoclinic Li3V2(PO4)(3) illustrates complex behavior of four successive two-phase transitions upon extraction of all three lithium ions between 3.0 and 4.8 V vs. Li/Li+. Each XRD pattern of the intermediate compositions can be fully indexed in the monoclinic space group P2(1)/n, with net volume reduction of 6.47%. In situ V K-edge XANES in combination with study of structural parameters is applied to find the vanadium valence state at plateau regions, which highlights the variations in electrochemical potential constraining to extraction of lithium ion from different crystal sites. (C) 2013 Elsevier B. V. All rights reserved.
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