Abstract
Lithium graphite interaction compound (Li-GIC) has potential plateaus depending on its staging in Li/Li-GIC cells. It is believed that the entropy of each stage is different depending on the total number of states created by the inserted Li+ and electrons in Li-GIC. On this basis, the entropy change with Li insertion has been calculated and the potential, using the reaction Gibbs function, has been estimated. The entropy term in the usual potential equation diverges for Li vacant and Li full GICs. The equation was improved and had finite values for these GICs depending on the mean size of the crystallites in the GIC. By the introduction of the intercalation pressure to our model, we confirmed that Li-GIC is unstable and decomposes into Li-poor and Li-rich phases. The potential was calculated using the entropy term for Li full GIC. The result agreed well with the experimental value. The entropy term contribution was very large for the potential difference of each plateau.
| Original language | English |
|---|---|
| Pages (from-to) | 460-465 |
| Number of pages | 6 |
| Journal | Journal of the Electrochemical Society |
| Volume | 147 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Feb 1 2000 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Electrochemistry
- Materials Chemistry
Cite this
Potential and thermodynamics of graphite anodes in Li-ion cells. / Yamaki, Jun Ichi; Egashira, Minato; Okada, Shigeto.
In: Journal of the Electrochemical Society, Vol. 147, No. 2, 01.02.2000, p. 460-465.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Potential and thermodynamics of graphite anodes in Li-ion cells
AU - Yamaki, Jun Ichi
AU - Egashira, Minato
AU - Okada, Shigeto
PY - 2000/2/1
Y1 - 2000/2/1
N2 - Lithium graphite interaction compound (Li-GIC) has potential plateaus depending on its staging in Li/Li-GIC cells. It is believed that the entropy of each stage is different depending on the total number of states created by the inserted Li+ and electrons in Li-GIC. On this basis, the entropy change with Li insertion has been calculated and the potential, using the reaction Gibbs function, has been estimated. The entropy term in the usual potential equation diverges for Li vacant and Li full GICs. The equation was improved and had finite values for these GICs depending on the mean size of the crystallites in the GIC. By the introduction of the intercalation pressure to our model, we confirmed that Li-GIC is unstable and decomposes into Li-poor and Li-rich phases. The potential was calculated using the entropy term for Li full GIC. The result agreed well with the experimental value. The entropy term contribution was very large for the potential difference of each plateau.
AB - Lithium graphite interaction compound (Li-GIC) has potential plateaus depending on its staging in Li/Li-GIC cells. It is believed that the entropy of each stage is different depending on the total number of states created by the inserted Li+ and electrons in Li-GIC. On this basis, the entropy change with Li insertion has been calculated and the potential, using the reaction Gibbs function, has been estimated. The entropy term in the usual potential equation diverges for Li vacant and Li full GICs. The equation was improved and had finite values for these GICs depending on the mean size of the crystallites in the GIC. By the introduction of the intercalation pressure to our model, we confirmed that Li-GIC is unstable and decomposes into Li-poor and Li-rich phases. The potential was calculated using the entropy term for Li full GIC. The result agreed well with the experimental value. The entropy term contribution was very large for the potential difference of each plateau.
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U2 - 10.1149/1.1393218
DO - 10.1149/1.1393218
M3 - Article
VL - 147
SP - 460
EP - 465
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
SN - 0013-4651
IS - 2
ER -