Synthesis and Characterization of Amorphous 3Fe[sub 2]O[sub 3]⋅2P[sub 2]O[sub 5]⋅10H[sub 2]O and Its Electrode Performance in Lithium Batteries

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Abstract
Amorphous 3Fe2O3⋅2P2O5⋅10H2O3Fe2O3⋅2P2O5⋅10H2O was prepared by oxidation of iron(II) phosphate, obtained by spontaneous precipitation from iron(II) and phosphate aqueous solutions, by heating in air at 100°C. The material was characterized by thermal analysis, Mössbauer spectroscopy, X-ray powder diffraction, and scanning electron micrograph analysis. The material, tested as cathode in a nonaqueous lithium cell, exhibited a specific capacity of about 140 mAh g−1mAh g−1 at a current density of 25 mA g−1.mA g−1. The utilization was reduced to about 76% by a tenfold increase of the discharge current. It showed an excellent cyclability. More than 1000 cycles were performed at about 50% of depth of discharge, with a capacity fade lower than 0.025%. © 2001 The Electrochemical Society. All rights reserved.

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