A Caltech Library Service

Phase Diagram of Li_xFePO_4

Dodd, J. L. and Yazami, R. and Fultz, B. (2006) Phase Diagram of Li_xFePO_4. Electrochemical and Solid-State Letters, 9 (3). A151-A155. ISSN 1099-0062.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


The phase diagram for LixFePO4 has been determined for different lithium concentrations and temperatures. 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 ItemConference Paper
Yazami, R.0000-0002-0085-5012
Fultz, B.0000-0002-6364-8782
Additional Information:© 2006 The Electrochemical Society (Submitted: 29 August 2005; revised: 7 November 2005; published online: 18 January 2006) The authors thank Dr. Khalil Amine, Dr. Ilias Belharouak, and Argonne National Laboratory for providing the LiFePO4 material. This work was supported by the U.S. Department of Energy under grant DE-FG03-00ER15035. California Institute Of Technology assisted in meeting the publication costs of this article.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-00ER15035
Subject Keywords:lithium compounds; iron compounds; phase diagrams; mixing; enthalpy; secondary cells
Issue or Number:3
Record Number:CaltechAUTHORS:DODessl06
Persistent URL:
Alternative URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3083
Deposited By: Archive Administrator
Deposited On:15 May 2006
Last Modified:13 Sep 2018 23:00

Repository Staff Only: item control page