Abstract
New routes for fabrications of LiFePO 4 crystals being a potential candidate for use as cathode materials for the next generation of rechargeable lithium ion batteries have been proposed. One is the crystallization of precursor LiFePO 4 glasses using conventional heat treatments in an electric furnace and the other is the patterning of crystal lines with an assembly of LiFePO 4 crystals at the glass surface by irradiation of continuous wave Nd:YAG laser with a wavelength of λ = 1064 nm. A glass with the composition of 26Li 2O–43FeO–5Nb 2O 5–26P 2O 5 (mol%) corresponding to a stoichiometric Li(Fe,Nb)PO 4 crystal was prepared, and the formation of LiFePO 4 crystals with an olivine structure was confirmed through a usual crystallization. Electrical conductivities at room temperature for the crystallized samples are less than 10 − 9 Scm − 1 , suggesting that Nb 5+ ions are not incorporated into LiFePO 4 crystals. Nd:YAG laser with powers of 70–100 mW and a scanning speed of 25 μm/s was irradiated to the glasses, and the formation of LiFePO 4 crystals was confirmed from X-ray diffraction (XRD) analyses and micro-Raman scattering spectra. XRD patterns suggest orientations of LiFePO 4 crystals in the lines.
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