Structural and electrochemical properties of LiAlyCo1-yO2 cathode for Li rechargeable batteries

LiAlyCo1-yO2 powders were synthesised at 800 C using acrylic acid as a chelating agent. The comparison between local structure refinements of LiCoO2 and LiAl0.25Co0.75O2 during the charging and cycling process was carried out by Co K-edge XAS. Al addition was found to cause a larger local structure...

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Veröffentlicht in:	Journal of the Electrochemical Society 2000-06, Vol.147 (6), p.2023-2028
Hauptverfasser:	YOON, W.-S, LEE, K.-K, KIM, K.-B
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Direct energy conversion and energy accumulation Electrical engineering. Electrical power engineering Electrical power engineering Electrochemical conversion: primary and secondary batteries, fuel cells Exact sciences and technology
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Zusammenfassung:	LiAlyCo1-yO2 powders were synthesised at 800 C using acrylic acid as a chelating agent. The comparison between local structure refinements of LiCoO2 and LiAl0.25Co0.75O2 during the charging and cycling process was carried out by Co K-edge XAS. Al addition was found to cause a larger local structure distortion during Li deintercalation compared to that of LiCoO2. Extended X-ray absorption fine structure refinements during Li deintercalation showed that the degree of structural disorder around Co atoms in LiAl0.25Co0.75O2 becomes higher than that of LiCoO2. XAS analysis for LiCoO2 and LiAl0.25Co0.75O2 during cycling revealed that the large capacity fading of the LiAl0.25Co0.75O2 electrode could be explained by the remaining Co4+ ions and local structure distortion. 24 refs.
ISSN:	0013-4651 1945-7111
DOI:	10.1149/1.1393479