Chang, M.T.M.T.ChangLin, Y.S.Y.S.LinLing, S.H.S.H.LingLiang, S.H.S.H.LiangLin, C.H.C.H.LinChen, K.C.K.C.ChenKUO-CHING CHEN2020-04-282020-04-282014https://scholars.lib.ntu.edu.tw/handle/123456789/486675A typical impedance spectrum of the lithium-ion cell is composed of two partially overlapped semicircles and a straight line at low frequency end. The overlapped semicircles make the parameters of the two RC circuit in equivalent circuit model of lithium-ion battery hard to be discriminated. To correctly obtain the parameters of the two RC circuit, it is necessary to find a method to distinguish Rct from Rsei. It is found that the charge transfer resistance Rct can be determined from the expression, Rct = RT/i0nF, where the exchange current density i0 is evaluated by the electrochemical model simulation, and R and T respectively denote the gas constant and the Kelvin temperature. As soon as Rct is achieved, the curve fitting of the impedance spectrum helps us to obtain the other seven parameters. © The Electrochemical Society.[SDGs]SDG7Charge transfer; Circuit simulation; Circuit theory; Curve fitting; Electric batteries; Ions; Lithium; Lithium alloys; Lithium compounds; Charge transfer resistance; Electrochemical modeling; Equivalent circuit model; Exchange current densities; Identification of the parameters; Impedance spectrum; Kelvin temperatures; Lithium-ion cells; Lithium-ion batteriesconference paper10.1149/06127.0125ecst2-s2.0-84925246839https://www.scopus.com/inward/record.uri?eid=2-s2.0-84925246839&doi=10.1149%2f06127.0125ecst&partnerID=40&md5=91570083d5e0d5f4fab8fe70df06a17f