Computer simulation of a porous positive electrode for lithium batteries |
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Authors: | Takayuki Doi Hirotaka Fukudome Shigeto Okada Jun-Ichi Yamaki |
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Affiliation: | 1. Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan;2. Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan |
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Abstract: | The discharge characteristics of a Li/LiyCoO2 cell were simulated by numerical calculations. Based on the program proposed by Newman's group, the change in entropy due to lithium-ion insertion into the active materials was introduced into the open-circuit potential (OCP) for more practical applications. The OCP of LiCoO2 (y = 1) at a full-discharge state was 3.82 V, which was determined from the original program. However, it should show a rapid decrease to minus infinity when discharge is complete (y = 1), which is due to the introduced entropy term. In addition, the local use of active materials across the LiyCoO2 electrode was not uniform, whereas the original program showed a constant value throughout the electrode. Based on the present results, the introduction of an entropy term to the OCP of LiyCoO2 works reasonably well for more practical applications. |
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Keywords: | Lithium-ion batteries Positive electrode Computer simulation Change in entropy Rate capability |
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