57Fe Mössbauer study of LixFe1-yCoyPO4 (y = 0, 0.1, 0.2) as cathode material for Li-ion batteries

• Published in: Hyperfine interactions Vol. 226; no. 1-3; pp. 791 - 796
• Main Authors: Rusakov, V., Yaroslavtsev, S., Matsnev, M., Kulova, T., Skundin, A., Novikova, S., Yaroslavtsev, A.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 2014
• Subjects: Atomic; Condensed Matter Physics; Hadrons; Heavy Ions; Molecular; Nuclear Physics; Optical and Plasma Physics; Physics; Physics and Astronomy; Surfaces and Interfaces; Thin Films; Lithium ion batteries; Mössbauer spectroscopy; Lithium iron phosphate; Cobalt doping
• ISSN: 0304-3843; 1572-9540
• DOI: 10.1007/s10751-013-0979-2

Lithium iron phosphates LiFe 1- y Co y PO 4 (y = 0, 0.1, 0.2) exposed to a charging process were studied by 57 Fe Mössbauer spectroscopy taking into account XRD and SEM data. Hyperfine parameters of the spectra were determined above and below the magnetic ordering temperature for all the samples. It was shown that the presence of Co impurity atoms in lithium phosphates gives no effect on the hyperfine interaction of 57 Fe 2+ cations. However, Co atoms in the nearest cation environment of Fe atoms lead to a significant change of the hyperfine interactions of 57 Fe 3+ cations. The Co impurity atoms distribution over the positions of the iron atoms in the structure is found not to be statistical,but correlated.