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The structure and magnetic properties of lithium iron pyrophosphate (Li[Fe.sub.1.5][P.sub.2][O.sub.7]), prepared by using a facile metal acetate approach for application in lithium-ion batteries, are examined. The studies have confirmed the absence of higher valence state Fe impurities and antiferromagnetic interactions due to the greater distance between two equivalent magnetic ions, which has vanished the Fe-O-Fe superexchange interactions.

The effect of carbon on the structural and electrochemical properties of LiFePO4 is investigated by characterizing the carbon coating deposited at the surface of LiFePO4 samples. The carbon deposit characterized by Raman scattering spectroscopy is hydrogenated with very small hydrogen/carbon ratio, so that it belongs to the family of the amorphous graphite carbon and the carbon deposit is similar to that obtained by pyrolysis technique at high temperature.