The advantages of mass normalized electrochemical impedance spectra for the determination of the kinetic parameters of LiMn2O4 cathodes

摘要: Abstract The electrochemical properties of LiMn2O4 (LMO) based cathode material with conducting polymer binder containing poly-3,4-ethylenedioxythiophene/polystyrene sulfonate (PEDOT:PSS) dispersion and carboxymethylcellulose (СМС) were investigated for electrodes three different thicknesses. effect the thickness LMO layer on kinetic parameters electrode processes (Rct, Dapp, i0) derived from impedance spectroscopy (EIS) has been experimentally analyzed. A simple approach estimating possible influence various real surface areas active masses by plotting dependencies normalized to mass component was proposed. This assumes that area is defined as total all particles component, their proportional given size grains subject random statistical distribution. It leads determination more reliable values gives base reasonable comparison results works, illustrated in example LMO. shown large difference charge transfer resistance Rct apparent diffusion coefficients Dapp thicknesses becomes insignificant after EIS data normalization loading. While obtained as-recorded non-normalized referred visible differ considerably, spectra calculation estimated Brunauer-Emmet-Teller (BET) yields closer values.