FTIR features of lithium-iron phosphates as electrode materials for rechargeable lithium batteries.
The essential structural features of lithium-metal phosphates (LMP) have been studied using FTIR spectroscopy which is a sensitive tool to probe the local environment in the solid materials. Various LMP materials where M is iron have been investigated including phospho-olivine LiFePO(4), diphosphate LiFeP(2)O(7), Nasicon-type phosphate Li(3)Fe(2)(PO(4))(3) and dihydrate FePO(4).2H(2)O. Vitreous and amorphous materials are also considered. Analysis of internal and external modes of vibration allows to distinguish between the different phases and the type of cationic environment in the framework. Results corroborate the contribution of the main factors which are responsible for the complexity of the spectra, i.e. departure from ideal symmetry, interactions between polyhedra, bridging atoms and lattice distortion.
Ait Salah
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Institut des Nano-Sciences de Paris, UMR-CNRS 7588, Université Pierre et Marie Curie, Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France.
Jozwiak
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P
Zaghib
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K
Garbarczyk
J
J
Gendron
F
F
Mauger
A
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Julien
C M
CM
D011756:Diphosphates / Q000737:chemistry*; D011211:Electric Power Supplies; D004566:Electrodes; D017743:Equipment Reuse; D005290:Ferric Compounds / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D007501:Iron / Q000737:chemistry; D058085:Iron Compounds / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry; D018020:Lithium Compounds / Q000737:chemistry*; D017616:Magnesium Compounds / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013057:Spectrum Analysis
D011756:Diphosphates; D005290:Ferric Compounds; D005296:Ferrous Compounds; D058085:Iron Compounds; C473349:LiFePO4; D018020:Lithium Compounds; D017616:Magnesium Compounds; D010710:Phosphates; D017640:Silicates; C518752:lithium ferric pyrophosphate; C034475:olivine; D008094:Lithium; C518753:ferrous phosphate; D007501:Iron; C035885:ferric phosphate