This article is cited in 2 papers

Mössbauer studies of structural properties and electrochemical characteristics of LiFePO$_4$

A. S. Kamzin^a, A. V. Bobyl'^b, E. M. Ershenko^b, E. I. Terukov^b, D. V. Agafonov^c, A. A. Valiullin<sup>a

a</sup> Kazan (Volga Region) Federal University
^b Ioffe Institute, St. Petersburg
^c State Technological Institute of St. Petersburg (Technical University)

Abstract: The valency state and local coordination of Fe ions of four industrial samples and a sample of cathodic materials for recharcheable lithium ion batteries obtained using an original technology of St. Petersburg State Technological Institute (Technological University) were studied using the Mössbauer effect on the $^{57}$Fe isotope. It was found that the main valency state for more than 90% of iron ions was Fe$^{2+}$. The values of isomer shift $\delta$ = 0.96–0.98 mm/s and quadrupole splitting $\sigma$ = 2.88–2.93 mm/s for Fe$^{2+}$ ions coincide with the values for compounds with the structure of olivine LiFePO$_4$ and occupy positions in highly distorted FeO$_6$ octahedrons. Fe$^{3+}$ ions are in octahedral and/or tetrahedral local positions.

Received: 20.03.2012

 English version: Technical Physics Letters, 2012, 38:8, 715–718

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