Abstract
The first lithiation and delithiation processes of commercial molybdenum disulfide (MoS2) electrode as anode material for lithium-ion batteries were studied by electrochemical impedance spectroscopy (EIS). It is found that the typical EIS is composed of four parts, namely, high-frequency semicircle, middle-frequency semicircle, low-frequency short sloping line, and low-frequency arc in the Nyquist diagram, and they can be attributed to the solid electrolyte interphase (SEI) film and ionic resistance in pores, charge transfer step, solid state diffusion process, and phase transformation, respectively. An equivalent circuit that includes elements related to the SEI film and charge transfer process, in addition to phase transformation, is proposed to simulate the experimental EIS data. The change of kinetic parameters for lithiation and delithiation of MoS2 electrode as a function of potential in the first charge–discharge cycle is analyzed, and the reason for the rapid degradation in capacity of the MoS2 electrode when cycled between 3.00 and 0.01 V is discussed in detail.
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