Application of Electrochemical Impedance Spectroscopy to Ferri/Ferrocyanide Redox Couple and Lithium Ion Battery Systems Using a Square Wave as Signal Input. (20th October 2015)

• Record Type: Journal Article
• Authors: Yokoshima, Tokihiko; Mukoyama, Daikichi; Nakazawa, Kazuhiro; Gima, Yuhei; Isawa, Hidehiko; Nara, Hiroki; Momma, Toshiyuki; Osaka, Tetsuya
• Is Part Of: Electrochimica acta. Volume 180(2015)
• Page Start: 922
• Page End: 928
• Publication Date: 2015-10-20
• Subjects: SP EIS Square-Potential Electrochemical Impedance Spectroscopy -- AC EIS Conventional (AC) Electrochemical Impedance Spectroscopy -- qAC EIS Quasi-AC Electrochemical Impedance Spectroscopy; Electrochemical impedance spectroscopy -- FFT impedance -- Input signal -- Square wave -- Lithium ion battery; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.08.083
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: Impedance spectroscopy using a square waveform as input signals was proposed. The square waveform was generated by simple measurement system without an FRA. The impedance of simple electrochemical reaction and LIB system can be measured. Many impedance responses are obtained by square waves with single frequency. The impedance for wide ranges of frequencies can be achieved using several measuring. Abstract: To realize electrochemical impedance spectroscopy (EIS) using a simple measurement system, application of a square potential/current waveform to the input signals of EIS was investigated. The impedance of a simple redox reaction of [Fe(CN)6 ] 4− /[Fe(CN)6 ] 3− solution was measured by the potentio-EIS using a square waveform as the input signal, which was generated by a potentiostat system without a frequency response analyzer (FRA). A steady impedance response in the frequency range of 40 Hz–3.5 kHz was obtained, and the impedance was obtained by the potentiostat system with an FRA. The errors—the differences between the impedance measured by EIS with a square potential waveform and that of conventional EIS—were sufficiently low to allow impedance analysis. The impedance of a lithium-ion battery (LIB) was measured by galvano-EIS using a square waveform input signal generated by a power controller. A steady impedance response in the frequency range of 5 Hz–2.5 kHz was obtained, and the errors were sufficiently low to allow impedance analysis. It was demonstrated that both square potential-EIS (SP-EIS) and square current-EIS (SC-EIS) have great potential as simple systems for measuring impedance. Moreover, it was demonstrated that SC-EIS has potential as a simple measurement system for analyzing the state of an LIB. Thus, the potential of the SP/SC-EIS methodology was confirmed for electrochemical systems.