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1 Materials Science Poland

1 2006

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Structural and transport properties of LiFe0.45Mn0.55PO4 as a cathode material in Li-ion batteries

Ojczyk W., Marzec J., Dygas J., Krok F., Liu R.S., Molenda J.

Materials Science Poland

2006

Vol. 24, No. 1

103--113

The paper presents investigations on structural, electrical and electrochemical properties of phosphoolivine, LiFe0.45Mn0.55PO4, synthesized at high temperatures. Moessbauer spectroscopy measurements confirmed the occurrence of iron(II), and X-ray absorption near edge structure (XANES) measurements evidenced manganese(II) and iron(II). Impedance spectroscopy enabled the separation of electrical conductivity into electronic and ionic components. The substitution of manganese for iron led to a noticeable increase in the electronic component of conductivity and only to a slight increase in the ionic component, compared to pure LiFePO4. Also, the chemical diffusion coefficient of lithium measured by GITT turned out larger in LixFe0.45Mn0.55PO4. It has been stated that the increased electronic conductivity in manganese-doped phospho-olivine activates the diffusional mechanism of lithium deintercalation.