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Electrochemical Studies of the LiFePO4 Thin Films prepared with Pulsed Lasser Deposition.

DE2004822962

Publication Date	2004
Personal Author	Song, S. W.; Reade, R. P.; Striebel, K. A.
Page Count	12
Abstract	Thin films of LiFePO4 have been prepared on stainless steel substrates with pulsed laser deposition utilizing an Ar atmosphere. Films were characterized with XRD, SEM, Raman spectroscopy and electrochemistry in liquid electrolyte. Raman spectral analysis revealed the presence of carbon in the films, even though the targets contained less than a few percent residual carbon. The Raman spectra also suggest the presence of various iron oxide species on the surface of the film. The 75nm film showed reversible cycling of more than 90 mAh/g for 60 cycles and a coulombic efficiency close to 1. Variable sweep rate cyclic voltammetry showed a diffusion-controlled reaction with an effective diffusivity of about 10-12 cm2/s. The performance of the thicker film was poor with a coulombic efficiency much less than 1.
Keywords	Electrochemistry Thin films Lasers Energy storage Electrodes Iron oxides Carbon Deposition Raman spectra Raman spectroscopy Stainless steels Substrates Targets X-ray diffraction Pulsed laser deposition
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Berkeley National Lab., CA. Environmental Energy Technologies Div.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200425

Electrochemical Studies of the LiFePO4 Thin Films prepared with Pulsed Lasser Deposition.

Electrochemical Studies of the LiFePO4 Thin Films prepared with Pulsed Lasser Deposition.
DE2004822962

Publication Date	2004
Personal Author	Song, S. W.; Reade, R. P.; Striebel, K. A.
Page Count	12
Abstract	Thin films of LiFePO4 have been prepared on stainless steel substrates with pulsed laser deposition utilizing an Ar atmosphere. Films were characterized with XRD, SEM, Raman spectroscopy and electrochemistry in liquid electrolyte. Raman spectral analysis revealed the presence of carbon in the films, even though the targets contained less than a few percent residual carbon. The Raman spectra also suggest the presence of various iron oxide species on the surface of the film. The 75nm film showed reversible cycling of more than 90 mAh/g for 60 cycles and a coulombic efficiency close to 1. Variable sweep rate cyclic voltammetry showed a diffusion-controlled reaction with an effective diffusivity of about 10-12 cm2/s. The performance of the thicker film was poor with a coulombic efficiency much less than 1.
Keywords	Electrochemistry Thin films Lasers Energy storage Electrodes Iron oxides Carbon Deposition Raman spectra Raman spectroscopy Stainless steels Substrates Targets X-ray diffraction Pulsed laser deposition
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Berkeley National Lab., CA. Environmental Energy Technologies Div.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200425