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In situ analysis of LiFePO4 batteries: Signal extraction by multivariate analysis

Published online by Cambridge University Press:  29 February 2012

Mark A. Rodriguez ,
Mark H. Van Benthem ,
David Ingersoll ,
Sven C. Vogel  and
Helmut M. Reiche
Mark A. Rodriguez
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185-1411
Mark H. Van Benthem
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185-1411
David Ingersoll
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185-1411
Sven C. Vogel
Affiliation:
Lujan Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Helmut M. Reiche
Affiliation:
Lujan Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

The electrochemical reaction behavior of a commercial Li-ion battery (LiFePO4-based cathode, graphite-based anode) has been measured via in situ neutron diffraction. A multivariate analysis was successfully applied to the neutron diffraction data set facilitating in the determination of Li bearing phases participating in the electrochemical reaction in both the anode and cathode as a function of state-of-charge (SOC). The analysis resulted in quantified phase fraction values for LiFePO4 and FePO4 cathode compounds as well as the identification of staging behavior of Li6, Li12, Li24, and graphite phases in the anode. An additional Li-graphite phase has also been tentatively identified during electrochemical cycling as LiC48 at conditions of ∼5% to 15% SOC.

Keywords

in situ neutron scatteringLi-ion batteryLiFePO4FePO4Li-graphite phases
Type
Technical Articles
Information
Powder Diffraction , Volume 25 , Issue 2 , June 2010 , pp. 143 - 148
Copyright
Copyright © Cambridge University Press 2010

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