Hydrated Fe111 phosphates were investigated as positive electrode materials in lithium batteries. Reversible lithium insertion into amorphous and crystalline FePO4·nH2O and Fe4(P2O7)3·n H2O compositions was found at potentials between 3.5 and 2.5 V vs. Li+/Li. The roles of (i) specific surface area, (ii) amorphous vs. crystalline state, (iii) H2O content, and (iv) electronic contact between particles in the composite positive electrode, on the electrochemical performances of these materials are discussed. Very stable cycling was obtained for optimized FePO4·1.6H2O and Fe4(P2O7)3·4H2O electrodes at an average voltage of 3.0 and 3.2 V vs. Li+/Li, respectively.
Hydrated iron phosphate FePO4nH2O and Fe4(P2O7)3nH2O as 3V positive electrodes in rechargeable lithium batteries / C., Masquelier; Reale, Priscilla; M., Morcrette; C., Wurm; L., Dupont; D., Larcher. - In: JOURNAL OF THE ELECTROCHEMICAL SOCIETY. - ISSN 0013-4651. - STAMPA. - 149:(2002), pp. A1037-A1044. [10.1149/1.1489686]
Hydrated iron phosphate FePO4nH2O and Fe4(P2O7)3nH2O as 3V positive electrodes in rechargeable lithium batteries
REALE, Priscilla;
2002
Abstract
Hydrated Fe111 phosphates were investigated as positive electrode materials in lithium batteries. Reversible lithium insertion into amorphous and crystalline FePO4·nH2O and Fe4(P2O7)3·n H2O compositions was found at potentials between 3.5 and 2.5 V vs. Li+/Li. The roles of (i) specific surface area, (ii) amorphous vs. crystalline state, (iii) H2O content, and (iv) electronic contact between particles in the composite positive electrode, on the electrochemical performances of these materials are discussed. Very stable cycling was obtained for optimized FePO4·1.6H2O and Fe4(P2O7)3·4H2O electrodes at an average voltage of 3.0 and 3.2 V vs. Li+/Li, respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
