Thermal stability and kinetics of delithiated LiCoO sub(2)

The thermal stability of the materials that comprise the battery has been one of the important issues. By using temperature programmed desorption-mass spectrometry (TPD-MS) and XRD, the thermal decomposition reaction of delithiated Li sub(x)CoO sub(2) (x = 1, 0.81, 0.65) was quantitatively analyzed....

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Bibliographic Details
Published in:Journal of power sources 2011-02, Vol.196 (4), p.2260-2263
Main Authors: Furushima, Yoshitomo, Yanagisawa, Chika, Nakagawa, Takeshi, Aoki, Yasuhito, Muraki, Naoki
Format: Article
Language:English
Subjects:
Activation energy
Battery
C (programming language)
Heating rate
Mathematical analysis
Spectrometry
Stoichiometry
Thermal decomposition
Thermal stability
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Summary:The thermal stability of the materials that comprise the battery has been one of the important issues. By using temperature programmed desorption-mass spectrometry (TPD-MS) and XRD, the thermal decomposition reaction of delithiated Li sub(x)CoO sub(2) (x = 1, 0.81, 0.65) was quantitatively analyzed. Delithiated Li sub(x)CoO sub(2) samples were metastable and liberated oxygen at a temperature of above 250 degree C. Liberated oxygen gas was quantified by TPD-MS. Structural changes of the samples were confirmed by XRD. We identified the stoichiometry of the thermal decomposition reaction of Li sub(x)CoO sub(2). Furthermore, to analyze the heating rate dependence of the oxygen generation, we calculated the activation energy (E sub(a)) of the thermal decomposition reaction. The average E sub(a) through the reaction of Li sub(0.81)CoO sub(2) is 130 kJ mol super(-1), and that of Li sub(0.65)CoO sub(2) is 97 kJ mol super(-1). The Li content decreased as the activation energy increased.
ISSN:0378-7753
DOI:10.1016/j.jpowsour.2010.09.076