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Electrochemical and electrical properties of. Nb- and/or C-containing LiFePO4 composites

Published online by Cambridge University Press:  01 February 2011

C. Delacourt ,
C. Wurm ,
L. Laffont ,
F. Sauvage ,
J.-B. Leriche ,
R. Bouchet ,
M. Morcrette ,
J-M. Tarascon  and
C. Masquelier
C. Delacourt
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, UMR CNRS #6007, Université de Picardie Jules Verne, 33 Rue St. Leu, 80039 Amiens Cedex 9, France
C. Wurm
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, UMR CNRS #6007, Université de Picardie Jules Verne, 33 Rue St. Leu, 80039 Amiens Cedex 9, France
L. Laffont
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, UMR CNRS #6007, Université de Picardie Jules Verne, 33 Rue St. Leu, 80039 Amiens Cedex 9, France
F. Sauvage
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, UMR CNRS #6007, Université de Picardie Jules Verne, 33 Rue St. Leu, 80039 Amiens Cedex 9, France
J.-B. Leriche
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, UMR CNRS #6007, Université de Picardie Jules Verne, 33 Rue St. Leu, 80039 Amiens Cedex 9, France
R. Bouchet
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, UMR CNRS #6007, Université de Picardie Jules Verne, 33 Rue St. Leu, 80039 Amiens Cedex 9, France
M. Morcrette
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, UMR CNRS #6007, Université de Picardie Jules Verne, 33 Rue St. Leu, 80039 Amiens Cedex 9, France
J-M. Tarascon
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, UMR CNRS #6007, Université de Picardie Jules Verne, 33 Rue St. Leu, 80039 Amiens Cedex 9, France
C. Masquelier
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, UMR CNRS #6007, Université de Picardie Jules Verne, 33 Rue St. Leu, 80039 Amiens Cedex 9, France
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Abstract

LiFePO4-based powders prepared through various synthesis conditions are presented. Depending on whether the precursors contain carbon or not, LiFePO4-based composites obtained contain significant amounts of carbon as well. We did not succeed in doping LiFePO4 with Nb and produced, instead, crystalline β-NbOPO4 and/or an amorphous (Nb, Fe, C, O, P) matrix around LiFePO4 particles. The total electrical conductivity is of ∼10−9 S.cm−1 at 25°C with an activation energy of ca. 0.65 eV for pure LiFePO4 and LiFePO4/β-NbOPO4 composite. C-containing LiFePO4 samples, including those that had been tentatively doped with Nb, are much more conductive (up to 1.6.10−1 S.cm−1) with an activation energy ΔE ∼ 0.08 eV.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 835: Symposium K – Solid-State Ionics , 2004 , K6.11
Copyright
Copyright © Materials Research Society 2005

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References

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