Electrochemical Impedance Spectroscopy (EIS) study of doped spinel manganese cathode oxide materials synthesized for Li-ion batteries

In-situ XRD study of a Chromium doped LiNi0.5Mn1.5O4 cathode for Li-ion battery

“…Diffusion coefficients were calculated both from the values of the electrode area denoted as DLi+ el and from the value of the active surface area of the active substance denoted as DLi+ as according to Table 1. The diffusion coefficient in our calculation reaches value 1.45×10 -14 cm 2 s -1 for LNMO in a full discharge state which is in good agreement with the result for LMO in the study [42] and is a much higher value than in the case of Co-doped LNMO in the study [40] whose authors also use the electrode area. Typical results of the GITT technique bring the values in the range of order 10 -10 -10 -12 cm 2 s -1 for all states of charge of LMNO [40].…”

“…The interpolated dependencies, including the equation of the linear interpolation, are shown in Figure 16. Per the findings of other authors who studied the diffusion properties of cathode materials such as LiFePO4 [39], LiNiMnO [40], LiNiCoMnO [41] or Al, Mg, and Co-doped LiMnO [42], we use a similar approach to determine the diffusion coefficient DLi+ that can be calculated from Eq. 3…”

Enhancing the Electrochemical Properties of Ti-Doped LiMn2O4 Spinel Cathode Materials Using a One-Step Hydrothermal Method

“…These were denoted by solid electrolyte interface impedance ( R f ) and charge-transfer impedance ( R ct ), which are typically associated with the electronic conductivity of materials . The increase in the semicircle indicated that the capacity for the partial charge transfer and the material transfer was reduced on the interface between the cathode and the electrolyte . The sloped line represented the Warburg impedance (W 1 ), which was related to the rate of Li + diffusion in the electrode.…”

“… 52 The increase in the semicircle indicated that the capacity for the partial charge transfer and the material transfer was reduced on the interface between the cathode and the electrolyte. 53 The sloped line represented the Warburg impedance (W 1 ), which was related to the rate of Li + diffusion in the electrode. As shown in Figure 9 , the semicircle for the T0 sample was larger than that for the T3 sample, while the lithium-ion diffusion rate was faster in the T3 sample.…”