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https://doi.org/10.1016/S0167-2738(02)00301-6
Title: | Cathodic properties of (Al, Mg) co-doped LiNi0.7Co0.3O2 | Authors: | Madhavi, S. Subba Rao, G.V. Chowdari, B.V.R. Li, S.F.Y. |
Keywords: | Aluminium Cathode Doping Li-ion batteries Magnesium |
Issue Date: | Dec-2002 | Citation: | Madhavi, S., Subba Rao, G.V., Chowdari, B.V.R., Li, S.F.Y. (2002-12). Cathodic properties of (Al, Mg) co-doped LiNi0.7Co0.3O2. Solid State Ionics 152-153 : 199-205. ScholarBank@NUS Repository. https://doi.org/10.1016/S0167-2738(02)00301-6 | Abstract: | Li(Ni0.7Co0.3)1-a-bAlaMgb O2 (a=0.00, 0.05 and a=0.05; b=0.02,0.05) compounds were synthesized and characterized by X-ray diffraction (XRD). Their cathodic behavior in coin cells with Li-metal anode and liquid electrolyte was studied by charge-discharge cycling at 0.11C (1C=180 mA/g) and 0.5C rate between 2.7 and 4.3 V and by cyclic voltammetry. The initial discharge capacity values of a=0.05, b=0.02; a=0.05, b=0.05 are 158 and 160 mA h/g, respectively, at 0.11C rate. At 0.5C rate, phases with a=0.05, b=0.02; a=0.05, b=0.05 show better capacity retention (82% and 90%, respectively) as compared to a=0.00, b=0.00; a=0.05, b=0.00 (62% and 67%, respectively) in the range 5-50 cycle. Cyclic voltammograms clearly indicate qualitative and quantitative changes as a result of Al- and (Al, Mg)-doping to give better reversibility of the cathode. Differential scanning calorimetry (DSC) data on the charged cathodes shows an increase in the decomposition temperature (Td) by 25-34 °C accompanied by decreased heat evolution indicating better thermal stability of these (Al, Mg) co-doped (a=0.05; b=0.02,0.05) cathodic compositions as compared to pristine LiNi0.7Co0.3O2 (a=b=0.0). © 2002 Published by Elsevier Science B.V. | Source Title: | Solid State Ionics | URI: | http://scholarbank.nus.edu.sg/handle/10635/95442 | ISSN: | 01672738 | DOI: | 10.1016/S0167-2738(02)00301-6 |
Appears in Collections: | Staff Publications |
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