2012 Fiscal Year Final Research Report
Impedance Analyses on Porous Electrodes Considering the Distribution of Time Constants
| Project/Area Number |
22560729
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | Tokyo University of Science |
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Principal Investigator |
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| Project Period (FY) |
2010 – 2012
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| Keywords | 電気化学インピーダンス / 電気化学測定 / 多孔質電極 / インピーダンススペクトル |
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| Research Abstract |
This study has been carried out to contribute to analyses on electrode structures of energy devices by applying an electrochemical impedance spectroscopy (EIS) to them. This study consists of EIS analyses on porous electrodes and cell structure analyses by finite element method (FEM). In the application of EIS, impedance spectra of porous electrode was separated depending on the frequency ranges, and itwas found that characteristic locus appeared for the porous structure in the middle frequency range. Pore size and electrolyte nature in the pore were investigated on the basis of impedance spectra. The current distribution during impedance measurement was calculated by FEM. It was found that the current distribution was changed depending on the imposed frequency. The relation between the porous structure and the characteristic impedance locus was discussed comparing the impedance results with the calculated current distribution. The analytical method developed by this study can be contributed to the material developments and operation monitoring’s of various energy devices.
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