Abstract
The crystal structure and electrochemical intercalation kinetics of spinel LiNi0.5Mn1.5O4 such as the resistance of a solid electrolyte interphase (SEI) film, charge transfer resistance (R ct), surface layer capacitance, exchange current density (i 0), and chemical diffusion coefficient are evaluated by Fourier transform infrared (FT-IR) and electrochemical impedance spectroscopy (EIS), respectively. FT-IR shows that LiNi0.5Mn1.5O4 thus obtained has a cubic spinel structure, which can be indexed in a space group of Fd3m with a disordering distribution of Ni. EIS indicates that R s is almost a constant at different states of charge. The thickness of SEI film increases with increasing of the cell voltage. R ct values evidently decreases when lithium ions deintercalated from the cathode in the voltage range from OCV to 4.6 V, and R ct value increases with increasing potential of deintercalation over 4.7 V. i 0 varies between 0.2 and 1.6 mA cm−2, and the solid phase diffusion coefficient of Li+ changed depending on the electrode potential in the range of 10−11–10−9 cm2 s−1.
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Published in Russian in Elektrokhimiya, 2010, Vol. 46, No. 2, pp. 236–242.
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Yi, TF., Li, CY., Zhu, YR. et al. Electrochemical intercalation kinetics of lithium ions for spinel LiNi0.5Mn1.5O4 cathode material. Russ J Electrochem 46, 227–232 (2010). https://doi.org/10.1134/S1023193510020151
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DOI: https://doi.org/10.1134/S1023193510020151