Nanostructured mixed phospho-olivine LiMnyFe1−yPO4/C composites having different ratio of manganese and iron (0 < y < 1) are prepared by an easy, quick and cost effective hydrothermal synthesis in the presence of a cationic surfactant and their electrochemical behaviour as cathodes for Li-ion battery is demonstrated. A detailed study of the influence of Fe substitution with Mn on the structure, morphology and electrochemical performances of the resulting samples is performed by means of X-ray powder diffraction and Rietveld refinement of the diffraction patterns, inductively coupled plasma atomic emission spectroscopy, X-ray photoelectron spectroscopy, N2 physisorption at 77 K, scanning and transmission electron microscopy, cyclic voltammetry and constant current charge–discharge cycling. The best performing LiMnyFe1−yPO4/C composite sample is able to deliver a very stable cycling behaviour for several hundred cycles with good specific capacity values, high Coulombic efficiency and rate capability and is also demonstrated to work in a real Li-ion battery configuration versus a graphite anode. These improved electrochemical properties are ascribed to the kind of synthesis adopted that leads to nanostructured particles, homogeneously coated by a thin layer of carbon, which exerts its positive effect by improving electronic conductivity and suppressing Mn dissolution from the olivine structure during prolonged cycling.

Surfactant-assisted mild hydrothermal synthesis to nanostructured mixed orthophosphates LiMnyFe1−yPO4/C lithium insertion cathode materials / Meligrana, Giuseppina; DI LUPO, Francesca; Ferrari, S.; Destro, Matteo; Bodoardo, Silvia; Garino, Nadia; Gerbaldi, Claudio. - In: ELECTROCHIMICA ACTA. - ISSN 0013-4686. - STAMPA. - 105:(2013), pp. 99-109. [10.1016/j.electacta.2013.04.153]

Surfactant-assisted mild hydrothermal synthesis to nanostructured mixed orthophosphates LiMnyFe1−yPO4/C lithium insertion cathode materials

MELIGRANA, Giuseppina;DI LUPO, FRANCESCA;DESTRO, MATTEO;BODOARDO, SILVIA;GARINO, NADIA;GERBALDI, CLAUDIO
2013

Abstract

Nanostructured mixed phospho-olivine LiMnyFe1−yPO4/C composites having different ratio of manganese and iron (0 < y < 1) are prepared by an easy, quick and cost effective hydrothermal synthesis in the presence of a cationic surfactant and their electrochemical behaviour as cathodes for Li-ion battery is demonstrated. A detailed study of the influence of Fe substitution with Mn on the structure, morphology and electrochemical performances of the resulting samples is performed by means of X-ray powder diffraction and Rietveld refinement of the diffraction patterns, inductively coupled plasma atomic emission spectroscopy, X-ray photoelectron spectroscopy, N2 physisorption at 77 K, scanning and transmission electron microscopy, cyclic voltammetry and constant current charge–discharge cycling. The best performing LiMnyFe1−yPO4/C composite sample is able to deliver a very stable cycling behaviour for several hundred cycles with good specific capacity values, high Coulombic efficiency and rate capability and is also demonstrated to work in a real Li-ion battery configuration versus a graphite anode. These improved electrochemical properties are ascribed to the kind of synthesis adopted that leads to nanostructured particles, homogeneously coated by a thin layer of carbon, which exerts its positive effect by improving electronic conductivity and suppressing Mn dissolution from the olivine structure during prolonged cycling.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2507686
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo