Investigation of solid electrolyte interfacial layer development during continuous cycling using ac impedance spectra and micro-structural analysis

Improving the cycling stability of LiCoO2 at 4.5V through co-modification by Mg doping and zirconium oxyfluoride coating

“…5d, the high-to-medium frequency semicircle corresponds to a combination of the resistances of the surface film (R sf ) covering the cathode particles and the corresponding CPE sf . The low frequency one reflects the charge-transfer resistance (R ct ) coupled with CPE dl [25,26].…”

Graft copolymer-based lithium-ion battery for high-temperature operation

“…7a shows the Nyquist plot of a fully discharged LiFePO 4 /GCE/Li cell and the corresponding equivalent circuit model (ECM) used for EIS analysis (inset in Fig. 7a) [55][56][57]. At high frequency, a non-zero x-axis intercept indicates the presence of solution resistance, or resistance through the bulk GCE (R BULK ) [42], and is represented by a resistor in the ECM.…”

Mg doping and zirconium oxyfluoride coating co-modification to enhance the high-voltage performance of LiCoO2 for lithium ion battery

“…7d, the high-to-medium frequency semicircle corresponds to a combination of the resistances of the surface film (R sf ) covering the cathode particles and the corresponding CPE sf . The low frequency one reflects the charge-transfer resistance (R ct ) coupled with CPE dl [32,33]. The fitted R sf and R ct values are summarized in Table 2.…”