Structural and ionic transport studies of LiAlyCo1+yO2 nano-structured intercalation compounds
Identifieur interne : 000219 ( PascalFrancis/Checkpoint ); précédent : 000218; suivant : 000220Structural and ionic transport studies of LiAlyCo1+yO2 nano-structured intercalation compounds
Auteurs : N. Amdouni [France, Tunisie] ; H. Zarrouk [Tunisie] ; F. Soulette [France] ; C. Julien [France]Source :
- Proceedings - Electrochemical society [ 0161-6374 ] ; 2003.
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Abstract
We present the electrochemical features behavior of LiAlyCo1-yO2 (0.0≤y≤0.3) electrodes prepared by "chimie douce" using the citrate route. The phase evolution was studied as a function of the aluminum substitution and the modification on the intercalation and deintercalation of Li ions. The overall electrochemical capacity of the LiAlyCo1-yO2 oxides have been reduced due to the sp metal substitution, however, a more stable charge-discharge cycling performances have been observed when electrodes are charged up to 4.3 V as compared to the performance of the native oxide. For such a cut-off voltage, the charge capacity of the Li//LiAl0.2Co0.8O2 cell is ca. 118 mAh/g. Kinetics characterized by the GITT method show enhancement of the chemical diffusion coefficients upon Al substitution in the LiAlyCo1-yO2 matrix.
Affiliations:
- France, Tunisie
- Gouvernorat de Tunis, Île-de-France
- Paris, Tunis
- Université Pierre-et-Marie-Curie, Université de Tunis - El Manar
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Co<sub>1+y</sub>
O<sub>2</sub>
nano-structured intercalation compounds</title>
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Co<sub>1+y</sub>
O<sub>2</sub>
nano-structured intercalation compounds</title>
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<front><div type="abstract" xml:lang="en">We present the electrochemical features behavior of LiAl<sub>y</sub>
Co<sub>1-y</sub>
O<sub>2</sub>
(0.0≤y≤0.3) electrodes prepared by "chimie douce" using the citrate route. The phase evolution was studied as a function of the aluminum substitution and the modification on the intercalation and deintercalation of Li ions. The overall electrochemical capacity of the LiAl<sub>y</sub>
Co<sub>1-y</sub>
O<sub>2</sub>
oxides have been reduced due to the sp metal substitution, however, a more stable charge-discharge cycling performances have been observed when electrodes are charged up to 4.3 V as compared to the performance of the native oxide. For such a cut-off voltage, the charge capacity of the Li//LiAl<sub>0.2</sub>
Co<sub>0.8</sub>
O<sub>2</sub>
cell is ca. 118 mAh/g. Kinetics characterized by the GITT method show enhancement of the chemical diffusion coefficients upon Al substitution in the LiAl<sub>y</sub>
Co<sub>1-y</sub>
O<sub>2</sub>
matrix.</div>
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nano-structured intercalation compounds</s1>
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Co<sub>1-y</sub>
O<sub>2</sub>
(0.0≤y≤0.3) electrodes prepared by "chimie douce" using the citrate route. The phase evolution was studied as a function of the aluminum substitution and the modification on the intercalation and deintercalation of Li ions. The overall electrochemical capacity of the LiAl<sub>y</sub>
Co<sub>1-y</sub>
O<sub>2</sub>
oxides have been reduced due to the sp metal substitution, however, a more stable charge-discharge cycling performances have been observed when electrodes are charged up to 4.3 V as compared to the performance of the native oxide. For such a cut-off voltage, the charge capacity of the Li//LiAl<sub>0.2</sub>
Co<sub>0.8</sub>
O<sub>2</sub>
cell is ca. 118 mAh/g. Kinetics characterized by the GITT method show enhancement of the chemical diffusion coefficients upon Al substitution in the LiAl<sub>y</sub>
Co<sub>1-y</sub>
O<sub>2</sub>
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