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Structural and ionic transport studies of LiAlyCo1+yO2 nano-structured intercalation compounds

Identifieur interne : 000A54 ( Main/Exploration ); précédent : 000A53; suivant : 000A55

Structural 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 :

RBID : Pascal:05-0330155

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English descriptors

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.


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Le document en format XML

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<sub>2</sub>
nano-structured intercalation compounds</title>
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<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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