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Dvgas, J.
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article
Structural and transport properties of LiFe<inf>0.45</inf>Mn<inf>0.55</inf>PO<inf>4</inf> as a cathode material in Li-ion batteries
Abstract
The paper presents investigations on structural, electrical and electrochemical properties of phosphoolivine, LiFe<sub>0.45</sub>Mn<sub>0.55</sub>PO<sub>4</sub>, 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 LiFePO<sub>4</sub>. Also, the chemical diffusion coefficient of lithium measured by GITT turned out larger in LiFe<sub>0.45</sub>Mn<sub>0.55</sub>PO<sub>4</sub>. It has been stated that the increased electronic conductivity in manganese-doped phospho-olivine activates the diffusional mechanism of lithium deintercalation.