In situ analysis of LiFePO sub(4) batteries: Signal extraction by multivariate analysis

The electrochemical reaction behavior of a commercial Li-ion battery (LiFePO sub(4) 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 bea...

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Bibliographic Details
Published in:Powder diffraction 2010-06, Vol.25 (2), p.143-148
Main Authors: Rodriguez, MA, Van Benthem, MH, Ingersoll, D, Vogel, S C, Reiche, H M
Format: Article
Language:English
Subjects:
Anodes
Batteries
Cathodes
Diffraction
Graphite
Multivariate analysis
Neutron diffraction
Phases
Online Access:Get full text
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Summary:The electrochemical reaction behavior of a commercial Li-ion battery (LiFePO sub(4) 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 LiFePO sub(4) and FePO sub(4) cathode compounds as well as the identification of staging behavior of Li sub(6), Li sub(12), Li sub(24), and graphite phases in the anode. An additional Li-graphite phase has also been tentatively identified during electrochemical cycling as LiC sub(48) at conditions of similar to 5% to 15% SOC.
ISSN:0885-7156