A family of mixed LiCoyNi(1-y)VO4 (y = 0.2, 0.5 and 0.8) compounds of potential use as high voltage cathode materials in lithium batteries, has been synthesized and characterized. The X-ray diffraction analysis showed that these compounds adopt an inverse spinel structure where in average 85% of the Ni2+ and Co2+ ions occupy octahedral sites and the other 15% occupy tetrahedral sites with the V5+ ions, although this occupation share is somewhat influenced by the preparation temperature. The annealing temperature plays also a key role in determining the particle size, as demonstrated by scanning electron microscope analysis. Cycling voltammetry tests showed that the Lithium insertion-deinsertion process in the LiCoyNi(1-y)VO4 electrode materials occurs reversibly around 4.3-4.4 V vs. Li, as also confirmed by cycling tests. The cycling capacity is somewhat modest; however, the trend of the cycling curves leads to foresee that a consistent increase in capacity may be obtained by extending the charging process beyond 4.6 V vs. Li, once a stable electrolyte will be available. (C) 2000 Elsevier Science B.V. All rights reserved.

Synthesis and characterization of LiCoyNi(1-y)VO4 lithium insertion materials / Panero, Stefania; Reale, Priscilla; F., Bonino; Scrosati, Bruno; M., Penazzi; S., Bodoardo; D., Mazza; N., Penazzi. - In: SOLID STATE IONICS. - ISSN 0167-2738. - 128:1-4(2000), pp. 43-52. [10.1016/s0167-2738(99)00260-x]

Synthesis and characterization of LiCoyNi(1-y)VO4 lithium insertion materials

PANERO, Stefania;REALE, Priscilla;SCROSATI, Bruno;
2000

Abstract

A family of mixed LiCoyNi(1-y)VO4 (y = 0.2, 0.5 and 0.8) compounds of potential use as high voltage cathode materials in lithium batteries, has been synthesized and characterized. The X-ray diffraction analysis showed that these compounds adopt an inverse spinel structure where in average 85% of the Ni2+ and Co2+ ions occupy octahedral sites and the other 15% occupy tetrahedral sites with the V5+ ions, although this occupation share is somewhat influenced by the preparation temperature. The annealing temperature plays also a key role in determining the particle size, as demonstrated by scanning electron microscope analysis. Cycling voltammetry tests showed that the Lithium insertion-deinsertion process in the LiCoyNi(1-y)VO4 electrode materials occurs reversibly around 4.3-4.4 V vs. Li, as also confirmed by cycling tests. The cycling capacity is somewhat modest; however, the trend of the cycling curves leads to foresee that a consistent increase in capacity may be obtained by extending the charging process beyond 4.6 V vs. Li, once a stable electrolyte will be available. (C) 2000 Elsevier Science B.V. All rights reserved.
2000
batteries; cathodes; electrodes; lithium; mixed oxides
01 Pubblicazione su rivista::01a Articolo in rivista
Synthesis and characterization of LiCoyNi(1-y)VO4 lithium insertion materials / Panero, Stefania; Reale, Priscilla; F., Bonino; Scrosati, Bruno; M., Penazzi; S., Bodoardo; D., Mazza; N., Penazzi. - In: SOLID STATE IONICS. - ISSN 0167-2738. - 128:1-4(2000), pp. 43-52. [10.1016/s0167-2738(99)00260-x]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/361667
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