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LiMBO3 (M=Fe, Mn): Potential Cathode for Lithium Ion Batteries

Published online by Cambridge University Press:  01 February 2011

Jan L. Allen ,
Kang Xu ,
Sam S. Zhang  and
T. Richard Jow
Jan L. Allen
Affiliation:
Sensors and Electron Devices Directorate, U.S. Army Research Laboratory Adelphi, MD 20783-1197, U.S.A.
Kang Xu
Affiliation:
Sensors and Electron Devices Directorate, U.S. Army Research Laboratory Adelphi, MD 20783-1197, U.S.A.
Sam S. Zhang
Affiliation:
Sensors and Electron Devices Directorate, U.S. Army Research Laboratory Adelphi, MD 20783-1197, U.S.A.
T. Richard Jow
Affiliation:
Sensors and Electron Devices Directorate, U.S. Army Research Laboratory Adelphi, MD 20783-1197, U.S.A.
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Abstract

Recently discovered borates, LiMBO3 (M=Fe, Mn), share similarities with LiFe(Mn)PO4. They are polyanion structures, contain extractable lithium and suffer from low electronic conductivity. They are attractive to replace expensive, less abundant redox metals in current use in cathodes with environmentally friendly iron or manganese. Phosphate or borate groups adjacent to the redox active metal increase the voltage of the redox couple through an inductive effect. The LiFeBO3 discharge curve shows a pseudo-plateau around 2.6 V for the Fe(II) / Fe(III) couple. This study brings to bear techniques to improve electrode conductivity to produce LiMBO3 composite electrodes thus allowing access to some of the high, theoretical specific capacity. At low current, up to 70 percent of lithium could be extracted from LiFeBO3 that was prepared in the presence of high surface area, highly electrically conductive carbon black. Attempts to improve the cathode properties of LiMnBO3 were less successful.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 730: Symposium V – Materials for Energy Storage, Generation, and Transport , 2002 , V1.8
Copyright
Copyright © Materials Research Society 2002

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