Castro-García, SocorroCastro Couceiro, AdaSeñarís-Rodríguez, M. A.Soulette, F.Julien, C.2015-02-092015-02-092003-01Castro-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):15-260167-2738http://hdl.handle.net/2183/14033We 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 LiLiNi0.5−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 LiLiNi0.35Al0.15Co0.5O2 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.engLithium aluminum cobalt oxideLithium batterySol–gel synthesisCathode materialLithium cobalt oxideLithium nickel oxidejournal articleopen access