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Nosaukums oriģinālvalodā Preparation, Structure, Impedance and Mössbauer Spectroscopy of LiFePO4, LiFePO4/C and Li3Fe2(PO4)3 + Fe2O3 Cathode Materials for Li-ion Batteries
Pētniecības nozare 1. Dabaszinātnes
Pētniecības apakšnozare 1.4. Ķīmija
Autori Antanas Orliukas
Jonas Reklaitis
R. Davidonis
D. Baltrunas
Vilma Venckute
Antonija Dindune
Dagnija Valdniece
Jānis Ronis
Tomas Šalkus
Eduardas Kazakevičius
Algirdas Kežionis
Atslēgas vārdi cathode materials, Li-ion secondary batteries, powders of LiFePO4, LiFePO4/C
Anotācija The powders of LiFePO4, LiFePO4/C and Li3Fe2(PO4)3 +Fe2O3 have been synthesized by the solid state reaction. The LiFePO4, LiFePO4/C compounds were synthesized in argon atmosphere and Li3Fe2(PO4)3 + Fe2O3 composite was prepared in air. LiFePO4 crystallizes in olivine structure and belongs to the orthorhombic symmetry (space group Pnma). The monoclinic (space group P21/n) Li3Fe2(PO4)3 is of the following lattice parameters — a = 8.5670(6) Å, b = 12.0163(8) Å, c = 8.6148(6) Å, = 79.82 degrees — and well correlates with literature. XRD analysis and Mössbauer spectroscopy also confirms the formation of the -Fe2O3 (hematite) belonging to rhombohedral symmetry (space group R¯3c) of the following lattice parameters: a = 5.0367(4)Å and c =13.7491 (18) Å.Ceramics were sintered for all the measurements.The powder was pressed at 300MPa. LiFePO4/C composite was sintered at 1073K for 1 h in argon atmosphere. The relative densities of LiFePO4/C composite and LiFePO4 ceramics were found to be 73.7% (theoretical density dt = 3.42 g/cm3) and 85.8% (dt = 3.6 g/cm3), respectively. The theoretical densities of Li3Fe2(PO4)3 and Fe2O3 investigated in the present work were found to be 3.127(4) g/cm3 and 5.267(11) g/cm3, respectively. The Archimedes density of the Li3Fe2(PO4)3+Fe2O3 ceramic sample was determined to be 3.06 g/cm3.Impedance spectroscopy of the ceramics has been performed in the frequency range 10 Hz – 10 GHz .
Hipersaite: http://lnfk.ftmc.lt/tezes/LNFK41.pdf 
Atsauce Orliukas, A., Reklaitis, J., Davidonis, R., Baltrunas, D., Venckute, V., Dindune, A., Valdniece, D., Ronis, J., Šalkus, T., Kazakevičius, E., Kežionis, A. Preparation, Structure, Impedance and Mössbauer Spectroscopy of LiFePO4, LiFePO4/C and Li3Fe2(PO4)3 + Fe2O3 Cathode Materials for Li-ion Batteries. No: 41-oji Lietuvos nacionalinė fizikos: programa ir pranešimų tezės, Lietuva, Vilnius, 17.-19. jūnijs, 2015. Vilnius: 2015, 320.-320.lpp. e-ISBN 978-609-95511-2-8.
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