Synthesis and electrical property of Li2axFeSi1axPxO4 as positive electrodes by spark-plasma-sintering process

Li2axFeSi1axPxO4 was prepared with the intention of improving the electrical conductivity by taking advantage of the high lithium ionic conductivity of Li4SiO4aLi3PO4 solid solution. A monoclinic single phase by SPS process was obtained for x = 0, 0.1 and 0.2 in Li2axFeSi1axPxO4 and the process prod...

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Published inJournal of power sources Vol. 244; pp. 631 - 635
Main Authors Arachi, Yoshinori, Higuchi, Yusuke, Nakamura, Ryota, Takagi, Yoshihiro, Tabuchi, Mitsuharu
Format Journal Article
LanguageEnglish
Published 01.12.2013
Subjects
Carbon
Electrical conductivity
Electrical properties
Electrical resistivity
Electrodes
Iron
Resistivity
Solid solutions
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Summary:Li2axFeSi1axPxO4 was prepared with the intention of improving the electrical conductivity by taking advantage of the high lithium ionic conductivity of Li4SiO4aLi3PO4 solid solution. A monoclinic single phase by SPS process was obtained for x = 0, 0.1 and 0.2 in Li2axFeSi1axPxO4 and the process produced the samples in high dense in half an hour while their containing less than 3% of carbons. The electrical conductivity was increased by the replacing (SiO4)4a with (PO4)3a, although the conductivity value itself was not reliable due to the carbon. The electrochemical properties of the samples using Li were evaluated and showed a slight improvement on the rate performance. A desired tetrahedral divalent Fe was confirmed in all investigated samples and ionic character caused by the localized 3d electron of Fe in the structure was encouraged by the complexation.
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ISSN:0378-7753
DOI:10.1016/j.jpowsour.2012.12.111