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    • Keywords

       

      Polyanion cathodes; LiFePO$_4$; Li$_2$FeP$_2$O$_7$; Li$_2$FeSiO$_4$; methylcellulose; quenching.

    • Abstract

       

      The polyanion cathodes for Li-ion batteries, namely LiFePO$_4$, Li$_2$FeP$_2$O$_7$ and Li$_2$FeSiO$_4$, were synthesized by very short high-temperature treatment (approximately several minutes) and subsequent quenching. Methylcellulose—a polymer with thermally driven water solubility—was used as the medium in which the precursor solutions were dispersed prior to high temperature treatment. The methylcellulose pyrolytically decomposes to carbon, thus producing the polyanion material/carbon composites of LiFePO$_4$/C, Li$_2$FeP$_2$O$_7$/C and Li$_2$FeSiO$_4$/C. The obtained powders have reduced crystallinity and significant microstructural characteristics: low crystallite size and notable microstrain. They exhibit stable electrochemical performances in both aqueous and organic electrolyte. The broadening of existing peaks in cyclic voltammetry and/or the emergence of new broad peaks was attributed to the presence of the amorphous phase in the samples. In galvanostatic charge–discharge tests, the materials provided high capacities at low current densities, while the highest rate performance was demonstrated by olivine-phosphate when compared to the other two materials.

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    • Author Affiliations

       

      MILOŠ MILOVIC´1 DRAGANA JUGOVIĆ1 MILICA VUJKOVIĆ2 MAJA KUZMANOVIĆ1 ANA MRAKOVIĆ3 MIODRAG MITRIĆ3

      1. Institute of Technical Sciences of SASA, Belgrade 11000, Serbia
      2. Faculty of Physical Chemistry, University of Belgrade, Belgrade 11000, Serbia
      3. Vinča Institute of Nuclear Sciences—National Institute of the Republic of Serbia, University of Belgrade, Belgrade 11000, Serbia
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