Cycling stability of LiNi0.80Co0.15Al0.05O2 cathode modified by solid-state electrolyte film

LiNbO3 Coating and F– Doping Stabilize the Crystal Structure and Ameliorate the Interface of LiNi0.88Co0.06Mn0.03Al0.03O2 to Improve the Electrochemical Properties and Safety Capability

“…All Nyquist plots demonstrate a similar feature, and the intersection of Z ′ axis with the beginning point of the Nyquist plots is related with the solution resistance ( R s ). The first semicircle diameter in the high-frequency region means the surface film impedance ( R sf ), the second semicircle diameter in the middle-frequency region is associated with the charge-transfer resistance ( R ct ), and the slope line in the low-frequency region means the Warburg impedance ( Z w ). , Table shows the fitted impedance parameters. In the third cycle, the four samples demonstrate no distinct difference in all resistance values when compared to the 200th cycle, indicating that the F – doping and LNO covering played a relatively small influence on the interface impedance.…”