Lithium-ion transfer at an electrolyte/non-graphitizable carbon electrode interface
| Autor: | Zempachi Ogumi, Takayuki Doi, Yasutoshi Iriyama, Takashi Nishizawa, Takeshi Abe, Kazuki Miyatake |
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| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
Working electrode
Materials science Standard hydrogen electrode Analytical chemistry Absolute electrode potential chemistry.chemical_element General Chemistry Electrolyte electrochemical properties pyrolysis Reference electrode Half-cell chemistry Standard electrode potential Raman spectroscopy General Materials Science Carbon non-graphitic carbon |
| Zdroj: | CARBON. 42(15):3183-3187 |
| ISSN: | 0008-6223 |
| Popis: | To elucidate the lithium-ion kinetics at a non-graphitizable carbon electrode, lithium-ion transfer at the interface between a non-graphitizable carbon electrode and a liquid electrolyte was studied by AC impedance spectroscopy. Non-graphitizable carbon prepared at 2273 K was used as a working electrode. After potential cycling between 3.0 and 0 V, Nyquist plots gave a semi-circle at 3.0 V vs. Li/Li + . At this potential, no lithium-ion insertion and extraction occurred, and therefore the semi-circle is due to surface film resistance. At potentials below 0.9 V, impedance spectra gave two semi-circles. The semi-circle in the middle to lower frequency region can be assigned to the charge transfer resistance due to lithium-ion transfer at the non-graphitizable carbon electrode/electrolyte interface. The temperature-dependence of the resistance showed Arrhenius-type behavior and gave an activation energy of about 70 kJ mol −1 regardless of the electrolyte used, indicating that a high activation barrier exists at the non-graphitizable carbon electrode/electrolyte interface for lithium-ion transfer. Non-graphitizable carbon treated by hot isostatic pressing (HIP) gives a smaller activation energy of about 60 kJ mol −1 . Therefore, the structure of non-graphitizable carbon significantly affects lithium-ion transfer kinetics at a non-graphitizable carbon electrode/electrolyte interface. |
| Databáze: | OpenAIRE |
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