Influence of aluminum doping on the properties of LiCoO2 and LiNi0.5Co0.5O2 oxides
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Influence of aluminum doping on the properties of LiCoO2 and LiNi0.5Co0.5O2 oxidesAutor(es)
Data
2003-01Cita bibliográfica
Castro-García S, Castro-Couceiro A, Señarís-Rodríguez MA, Soulette F, Julien C. Influence of aluminum doping on the properties of LiCoO2 and LiNi0.5Co0.5O2 oxides. Solid State Ionics. 2003;156(1-2):15-26
Resumo
We have prepared LiCo1−yAlyO2 and LiNi0.5−yAlyCo0.5O2 (0≤y≤0.3) powder samples by a low temperature sol–gel method using succinic acid as chelating agent. We have studied the details of their crystallographic and local structure by X-ray diffraction (XRD) and FTIR spectroscopy, respectively; we have analyzed their chemical composition by ICP and obtained information about the morphology of the polycrystalline particles by SEM. Also, we have studied the electrochemical performance of the as-prepared materials in the LiLiNi0.5−yAlyCo0.5O2 cells cycled in the potential range 2.5–4.2 V finding that the overall capacity of the oxides has been reduced due to the metal substitution. For example, at 4.2 V cut-off, the charge capacity of the LiLiNi0.35Al0.15Co0.5O2 cell is ca. 115 mA h/g. However, more stable charge–discharge cycling performances have been obtained as compared to those displayed by the native oxides. Finally, we have characterized the kinetics of Li-diffusion by the galvanostatic intermittent titration technique and, according to our results, Al substitution provides an increase in the chemical diffusion coefficients of Li ions in the LiNi0.5−yAlyCo0.5O2 matrix.
Palabras chave
Lithium aluminum cobalt oxide
Lithium battery
Sol–gel synthesis
Cathode material
Lithium cobalt oxide
Lithium nickel oxide
Lithium battery
Sol–gel synthesis
Cathode material
Lithium cobalt oxide
Lithium nickel oxide
Versión do editor
ISSN
0167-2738