LiFe(x)Co((1-x))PO(4) (x=0.2, 0.5, 0.8, 1) solid solutions have been prepared by solid state reaction method to sevatudy the electrochemical performance of these olivine structure compounds as cathode material for lithium-ion batteries. SEM observations, X-ray powder diffraction (XRPD) profiles and Rietveld refinement have been carried out to investigate the structural characteristics and morphology of the samples. During the preparations citric acid was added to the reactants to improve the electronic conductivity of the cathode. The results showed that when present in small amounts, Co exerts a beneficial effect mainly at the first cycles where the additive is not effective. At higher Co levels this positive effect seems to cease, probably is still present but hidden by the progressive electrolyte degradation that causes a decay of the electrochemical performance. (C) 2003 Elsevier Ltd. All rights reserved.
Mixed lithium phosphates as cathode materials for Li-Ion cells / N., Penazzi; M., Arrabito; M., Piana; S., Bodoardo; Panero, Stefania; I., Amadei. - In: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY. - ISSN 0955-2219. - 24:6(2004), pp. 1381-1384. (Intervento presentato al convegno 8th International Conference on Electronic Ceramics and Their Applications (ELECTROCERAMICS VIII) tenutosi a Rome, ITALY nel AUG 25-28, 2002) [10.1016/s0955-2219(03)00568-5].
Mixed lithium phosphates as cathode materials for Li-Ion cells
PANERO, Stefania;
2004
Abstract
LiFe(x)Co((1-x))PO(4) (x=0.2, 0.5, 0.8, 1) solid solutions have been prepared by solid state reaction method to sevatudy the electrochemical performance of these olivine structure compounds as cathode material for lithium-ion batteries. SEM observations, X-ray powder diffraction (XRPD) profiles and Rietveld refinement have been carried out to investigate the structural characteristics and morphology of the samples. During the preparations citric acid was added to the reactants to improve the electronic conductivity of the cathode. The results showed that when present in small amounts, Co exerts a beneficial effect mainly at the first cycles where the additive is not effective. At higher Co levels this positive effect seems to cease, probably is still present but hidden by the progressive electrolyte degradation that causes a decay of the electrochemical performance. (C) 2003 Elsevier Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
