Open AccessElectrochemical Impedance Spectroscopy Study of LiFePO4/Li during Discharging Process
Author(s) -
Sudaryanto Sudaryanto,
Yustinus Purwamargapratala,
Evi Yulianti,
Wagiyo Honggowiranto,
Evvy Kartini
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/924/1/012035
Subject(s) - dielectric spectroscopy , nyquist plot , equivalent circuit , analytical chemistry (journal) , materials science , battery (electricity) , electrochemistry , electrical impedance , electrochemical cell , lithium iron phosphate , spectral line , spectroscopy , chemistry , electrical engineering , voltage , electrode , thermodynamics , power (physics) , engineering , physics , chromatography , astronomy , quantum mechanics
Electrochemical impedance spectroscopy (EIS) study has been applied to investigate the electrochemical properties of LiFePO 4 /Li half-cell at initial state (before and after charge/discharge process), and a certain dept of discharge (DoD). The impedance spectra were collected over the frequency range from 42 Hz to 5 MHz. The EIS spectra of LiFePO 4 /Li half-cell show the appearance of semicircles in which the diameter increased with DoD. An equivalent circuit was constructed to each spectrum in order to elucidate to electrochemical properties changes of LiFePO 4 /Li half-cell battery as function of DoD. The information of bulk and interfacial resistances are obtained by modeling with the equivalent circuits according with the Nyquist plots of each spectrum. The experiment results show the increase in the resistance of LiFePO 4 /Li half-cell with the DoD.