The EIS spectra of the pristine and LATP-coated LiNi0.5Mn1.5O4 samples at 25 C: (a) after 5 cycles, (b) after 100 cycles at 2 C and 55 C. Zre vs. u 0.5 plots in the low-frequencyregion obtained from EIS measurements: (c) after 5 cycles (d) after 100 cycles.