Thermal properties of fully delithiated olivines

Title
Thermal properties of fully delithiated olivines
Author
선양국
Keywords
Delithiation; Olivine; Thermal stability; Cathode; Lithium battery
Issue Date
2014-06
Publisher
ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Citation
JOURNAL OF POWER SOURCES,256,p.479-484
Abstract
Carbon-coated LiMnxFe1-xPO4 (x = 0, 0.5 and 1) is fully delithiated using NO2BF4 oxidant to investigate thermal behavior as a function of temperature as high as 700 degrees C in an Ar atmosphere. Reitveld refinement of X-ray diffraction (XRD) studies indicates readiness of chemical delithiation, except for Li0MnPO4, hydrated to amorphous MnPO4 center dot 2H(2)O. Thermal studies coupled with thermogravimetric analysis and in situ high temperature XRD demonstrate that the phase stability is affected by substituted Mn at an elevated temperature. The Li0FePO4 is stable up to 500 degrees C, maintaining the original olivine structure with a small amount of oxygen release. At higher temperatures, the phase was transformed to Fe-3(PO4)(2) and Fe2P2O7. In contrast, the phase transformation temperature is apparently reduced to as low as 200 degrees C by the addition of Mn into the crystal structure, which is related to the phase transformation to (Mn0.5Fe0.5)(3)(PO4)(2) associated with fast oxygen loss from the original structure. As a result, the better thermal stability of Li0FePO4 is attributed to less oxygen loss, which delays the phase transformation, resulting in less exothermic heat in the temperature range. (C) 2014 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S037877531400069X?via%3Dihubhttp://hdl.handle.net/20.500.11754/56240
ISSN
0378-7753; 1873-2755
DOI
10.1016/j.jpowsour.2014.01.046
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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