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Energy Storage Materials Based on Iron Phosphate

  • Pier Paolo Prosini (a1), Maria Carewska (a1), Marida Lisi (a1), Stefano Passerini (a1), Silvera Scaccia (a1) and Mauro Pasquali (a2)...

Abstract

Several iron phosphates were synthesized by solution-based techniques and tested as cathodes in non aqueous lithium cells. The addition of phosphate ions to a solution of iron (II) produced crystalline Fe3(PO4)2. This material is easily oxidized by air to form an amorphous phase that is able to reversibly intercalate lithium. The amorphous compound was identified to be a mixture of FePO4 and Fe2O3. A new synthetic route was developed to prepare pure amorphous FePO4. Amorphous LiFePO4 was obtained by chemical lithiation of FePO4. The material was heated at 500°C under reducing atmosphere to obtain nano-crystalline LiFePO4. This latter material showed excellent electrochemical performance when used as cathode of lithium cells.

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1. Padhi, A.K., Nanjundaswamy, K.S., Masquelier, C., Okada, S., and Goodenough, J.B., J. Electrochem. Soc., 144, 1609 (1997).
2. Padhi, A.K., Nanjundaswamy, K.S., and Goodenough, J.B., J. Electrochem. Soc., 144, 1188 (1997).
3. Yamada, A., Chung, S.C., and Hinokuma, K., J. Electrochem. Soc., 148, A224 (2001).
4. Huang, H., Yin, S.-C., and Nazar, L.F., Electrochem. Solid State Lett., 4, A170 (2001).
5. Prosini, P.P., Cianchi, L., Spina, G., Lisi, M., Scaccia, S., Carewska, M., Minarini, C., and Pasquali, M., J. Electrochem. Soc., 148, A1125 (2001).
6. Scaccia, S., Carewska, M., Bartolomeo, A. Di, and Prosini, P.P., Thermochim. Acta, 383, 145 (2002).

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Energy Storage Materials Based on Iron Phosphate

  • Pier Paolo Prosini (a1), Maria Carewska (a1), Marida Lisi (a1), Stefano Passerini (a1), Silvera Scaccia (a1) and Mauro Pasquali (a2)...

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