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New Iron Oxide Positive Active Material for Lithium Secondary Batteries

Published online by Cambridge University Press:  10 February 2011

K. Amine ,
H. Yasuda  and
M. Yamachi
K. Amine
Affiliation:
Argonne National Laboratory, Argonne, IL 60439-4837, USA
H. Yasuda
Affiliation:
Japan Storage Battery Co. Ltd., Kyoto 601, Japan
M. Yamachi
Affiliation:
Japan Storage Battery Co. Ltd., Kyoto 601, Japan
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Abstract

Beta-iron oxy-hydroxide, which exhibits a (2×2) tunnel-type structure similar to that of (α-MnO2, was found to intercalate reversibly lithium in the tunnels. This material exhibits three voltage plateaus at 2.3, 1.5 and 0.7 V and has an over all discharge capacity of 1100 mAh/g. When cycling in the 2–V region, the material exhibits high capacity of 275 mAh/g and very good cyclic reversibility. X-ray photoelectron spectroscopy (XPS) of the discharged material showed that iron is reduced to the divalent state, and the lithium incorporated in the tunnels is purely ionic. This result explains the good reversibility of this electrode material. When discharged to 0.5 V, however, the structure of the material collapsed, and metallic iron was detected in the X-ray diffraction pattern.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 271
Copyright
Copyright © Materials Research Society 1999

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References

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