LiFePO4/C composites were prepared by using organo-phosphonates as a single source of iron, phosphorus and carbon. Fe[RPO3](H2O)-H-. (R = methyl or phenyl group) was heated in the presence of Li2CO3 at high temperature and under nitrogen flux. Elemental carbon is formed on the surface of LiFePO4 particles leaving a carbon coated material. The materials were characterized by elemental analysis, TG/DTA, XRPD and SEM. Coulometric titration showed that some impurities are present in the final products. The material prepared starting from the iron(II) phenyl phosphonate showed higher discharge capacity, specific energy, and specific power. The specific energy evaluated at C/10 rate was about 520 Wh kg(-1). The specific power calculated at 3C rate was in excess at 1400 W kg(-1) while the specific energy was about 63% of the energy delivered at C/10. No capacity fading was observed upon cycling. The performance of LiFePO4 prepared from the iron(H) methyl phosphonate was found to be slightly lower, probably due to the lower carbon content. (c) 2005 Elsevier B.V. All rights reserved.

A versatile method of preparation of carbon-rich LiFePO4: A promising cathode material for Li-ion batteries / Pasquali, Mauro; Dell'Era, Alessandro; Elvira M., Bauer; Carlo, Bellitto; Guido, Righini; Pier Paolo, Prosini. - In: JOURNAL OF POWER SOURCES. - ISSN 0378-7753. - STAMPA. - 146:1-2(2005), pp. 544-549. ((Intervento presentato al convegno 12th International Meeting on Lithium Batteries tenutosi a Nara, JAPAN nel JUN 27-JUL 02, 2004 [10.1016/j.jpowsour.2005.03.059].

A versatile method of preparation of carbon-rich LiFePO4: A promising cathode material for Li-ion batteries

PASQUALI, Mauro;DELL'ERA, Alessandro;
2005

Abstract

LiFePO4/C composites were prepared by using organo-phosphonates as a single source of iron, phosphorus and carbon. Fe[RPO3](H2O)-H-. (R = methyl or phenyl group) was heated in the presence of Li2CO3 at high temperature and under nitrogen flux. Elemental carbon is formed on the surface of LiFePO4 particles leaving a carbon coated material. The materials were characterized by elemental analysis, TG/DTA, XRPD and SEM. Coulometric titration showed that some impurities are present in the final products. The material prepared starting from the iron(II) phenyl phosphonate showed higher discharge capacity, specific energy, and specific power. The specific energy evaluated at C/10 rate was about 520 Wh kg(-1). The specific power calculated at 3C rate was in excess at 1400 W kg(-1) while the specific energy was about 63% of the energy delivered at C/10. No capacity fading was observed upon cycling. The performance of LiFePO4 prepared from the iron(H) methyl phosphonate was found to be slightly lower, probably due to the lower carbon content. (c) 2005 Elsevier B.V. All rights reserved.
carbon-rich lifepo4; cathode material; li-ion batteries
01 Pubblicazione su rivista::01a Articolo in rivista
A versatile method of preparation of carbon-rich LiFePO4: A promising cathode material for Li-ion batteries / Pasquali, Mauro; Dell'Era, Alessandro; Elvira M., Bauer; Carlo, Bellitto; Guido, Righini; Pier Paolo, Prosini. - In: JOURNAL OF POWER SOURCES. - ISSN 0378-7753. - STAMPA. - 146:1-2(2005), pp. 544-549. ((Intervento presentato al convegno 12th International Meeting on Lithium Batteries tenutosi a Nara, JAPAN nel JUN 27-JUL 02, 2004 [10.1016/j.jpowsour.2005.03.059].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/364641
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