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Functionalization of LiFePO4/C by Spontaneous Reduction of In-situ Generated Bromobenzene Diazonium Ions in Organic Media

Published online by Cambridge University Press:  10 June 2015

Nicolas Delaporte ,
Karim Zaghib  and
Daniel Bélanger
Nicolas Delaporte
Affiliation:
Département de Chimie, Université du Québec à Montréal, Case Postale 8888, succursale Centre-Ville, Montréal (Québec) Canada H3C 3P8.
Karim Zaghib
Affiliation:
Institut de Recherche d’Hydro-Québec (IREQ), 1800 Boulevard Lionel Boulet, Varennes, QC, Canada J3X 1S1.
Daniel Bélanger
Affiliation:
Département de Chimie, Université du Québec à Montréal, Case Postale 8888, succursale Centre-Ville, Montréal (Québec) Canada H3C 3P8.
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Abstract

Bromophenyl moieties were attached to the carbon-coated LiFePO4 (LiFePO4/C) surface by spontaneous reduction of in-situ generated 4-bromobenzene diazonium ions in organic media. The presence of the surface organic species on the grafted LiFePO4/C powders was confirmed by X-ray photoelectron spectroscopy. Thermogravimetric analyses revealed a low loading (lower than 1 wt. %) of grafted molecules. The electrochemical characterization of the LiFePO4/C cathodes showed that a low loading of bromophenyl groups at the LiFePO4/C surface can enhance the rate of Li+ extraction, presumably due to the decrease of the LiFePO4/C agglomerate size and an increase of the wettability of the electrode. On the other hand, poor performances were obtained using the grafted cathode material with the highest loading of bromophenyl moieties.

Keywords

core/shellLisurface chemistry
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1773: Symposium G – Next Generation Electrochemical Energy Storage and Conversion Systems―Synthesis, Processing, Characterization and Manufacturing , 2015 , pp. 21 - 26
Copyright
Copyright © Materials Research Society 2015 

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References

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