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Title: Effect of aluminum doping on cathodic behaviour of LiNi0.7Co0.3O2
Authors: Madhavi, S.
Subba Rao, G.V.
Chowdari, B.V.R. 
Li, S.F.Y. 
Issue Date: 1-Feb-2001
Citation: Madhavi, S., Subba Rao, G.V., Chowdari, B.V.R., Li, S.F.Y. (2001-02-01). Effect of aluminum doping on cathodic behaviour of LiNi0.7Co0.3O2. Journal of Power Sources 93 (1-2) : 156-162. ScholarBank@NUS Repository.
Abstract: Solid solutions of the formula LiNi0.7Co0.3-zAlzO2 (0.0≤z≤0.20) have been synthesized and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and surface area and density measurements. Single-phase materials are obtained for z≤0.15. Their cathodic behaviour in coin cells with Li metal as anode and a liquid electrolyte is examined by charge-discharge cycling at the 0.13C rate between 2.7 and 4.3 V and by cyclic voltammetry. Irreversible capacity loss occurs for all the compositions, but the phases with z = 0.05 and z = 0.10 show much less capacity fading at the end of 50 cycles as compared to those with z = 0.0 and z>0.10. The 5 at.% Al-doped compound showed a discharge capacity of 137 mA h-1 g after 100 cycles that corresponds to 70% capacity retention. The beneficial effect of Al-doping (z≤0.10) is corroborated by cyclic voltammograms and differential scanning calorimetry (DSC) data on charged cathodes.
Source Title: Journal of Power Sources
ISSN: 03787753
DOI: 10.1016/S0378-7753(00)00559-0
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