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Determining the Phase Diagram of Li_xFePO_4

Dodd, J. L. and Yazami, R. and Fultz, B. (2006) Determining the Phase Diagram of Li_xFePO_4. ECS Transactions, 1 (26). pp. 27-38. ISSN 1938-6737. http://resolver.caltech.edu/CaltechAUTHORS:20180913-133203503

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Abstract

The phase diagram for Li_xFePO_4 has been determined for different lithium concentrations and temperatures. X-ray diffraction analysis was used to determine phase fractions at temperatures between room temperature and 400 °C for Li_xFePO_4 at different states of lithiation. The two low- temperature phases, heterosite and triphylite, have previously been shown to transform to a disordered solid solution at elevated temperatures. This disordered phase allows for a continuous transition between the heterosite and triphylite phases and is stable at relatively low temperatures. At intermediate temperatures the proposed phase diagram resembles a eutectoid system, with eutectoid point at around x=0.6 and 200 °C. Kinetics of mixing and unmixing transformations are reported, including the hysteresis between heating and cooling. The enthalpy of this transition is at least 700 J/mol.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1149/1.2209354DOIArticle
http://resolver.caltech.edu/CaltechAUTHORS:DODessl06Related ItemJournal Article
ORCID:
AuthorORCID
Yazami, R.0000-0002-0085-5012
Fultz, B.0000-0002-6364-8782
Alternate Title:Determining the Phase Diagram of LixFePO4
Additional Information:© 2006 ECS - The Electrochemical Society. The content of this paper has been published in the journal Electrochemical and Solid State Letters, Volume 9, Number 3, as “Phase Diagram of Li_xFePO_4.” The authors thank Dr. Khalil Amine, Dr. Ilias Belharouak and Argonne National Laboratory for providing the LiFePO_4 material. This work was supported by the U.S. Dept. of Energy under grant DE-FG03-00ER15035.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-00ER15035
Record Number:CaltechAUTHORS:20180913-133203503
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180913-133203503
Official Citation:Joanna L. Dodd, Brent Fultz, and Rachid Yazami Determining the Phase Diagram of LixFePO4 ECS Trans. 2006 1(26): 27-38; doi:10.1149/1.2209354
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89620
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:14 Sep 2018 16:09
Last Modified:14 Sep 2018 16:10

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