Discovery Phospho-olivines as Positive-Electrode Materials for Rechargeable Lithium Batteries A.K.Padhi,'K.S.Nanjundaswamy,"and J.B.Goodenough Center for Materials Science and Engineering,The University of Texas at Austin,Austin,Texas 78712-1063,USA Reversible extraction of lithium from LiFePO,and insertion of lithium into FePO at 3.5 V vs.lithium at 0.05 mA/cm2 shows this material to be an excellent candidate for the cathode of a low-power,rechargeable lithium battery that is inexpensive,nontoxic, Akshaya Padhi J.B.Goodenough and environmentally benign. J.Electrochem.Soc.,Vol.144,No.4,April 1997 3Discovery Akshaya Padhi J. B. Goodenough J. Electrochem. Soc., Vol. 144, No. 4, April 1997 Reversible extraction of lithium from LiFePO4 and insertion of lithium into FePO4 at 3.5 V vs. lithium at 0.05 mA/cm2 shows this material to be an excellent candidate for the cathode of a low-power, rechargeable lithium battery that is inexpensive, nontoxic, and environmentally benign. 3