Title:
DIFFERENTIAL ELECTROCHEMICAL IMPEDANCE ANALYSIS METHOD
Document Type and Number:
Japanese Patent JP2023007980
Kind Code:
A
Abstract:
To solve a problem such that with a conventional electrochemical impedance analysis method, it is essentially impossible to evaluate only a spectrum that changes a state.SOLUTION: According to an analysis method of the present invention, first impedance data in which electrochemical impedance of a reference sample is measured at first plurality of frequencies and second impedance data in which a sample after change in a state is measured at second plurality of frequencies are prepared. Of these data, data measured at a common frequency is selected. Difference impedance data is obtained by calculating difference of the first impedance data from the second impedance data for each measurement frequency for each of real and imaginary parts. These are graphically displayed as a differential impedance spectrum. Next, an equivalent circuit model that conforms to this spectrum is determined and model parameters are optimized. The optimized parameter is defined as a numerical value representing a magnitude of change in a state of the sample.SELECTED DRAWING: Figure 1
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Inventors:
KOBAYASHI KIYOSHI
MASUDA NAOYA
FUJII YUTA
YANAGI KAZUAKI
UTSUNO FUTOSHI
HIGUCHI HIROYUKI
MASUDA NAOYA
FUJII YUTA
YANAGI KAZUAKI
UTSUNO FUTOSHI
HIGUCHI HIROYUKI
Application Number:
JP2021111166A
Publication Date:
January 19, 2023
Filing Date:
July 03, 2021
Export Citation:
Assignee:
NAT INST MATERIALS SCIENCE
IDEMITSU KOSAN CO
IDEMITSU KOSAN CO
International Classes:
G01R31/389; G01R27/02; G01R31/367; G01R31/392; H01M10/48
Attorney, Agent or Firm:
Seiro