Why battery development relies on electrochemical impedance spectroscopy

The Li-ion battery is usually composed of two electrodes, liquid electrolyte and a separator with a permeable membrane, placed in between the two electrodes, to stop the battery from short-circuiting. When the battery is first charged, delithiation occurs at the positive electrode (cathode) and lithium cations move through the electrolyte to the negative electrode (anode). Solid electrolyte interface (SEI) also occurs during this first charge. On further charges, lithium cations move from the anode to the cathode.

Although Li-ion batteries are simple in design, the development is demanding. Electrochemical impedance spectroscopy (EIS) is needed to support this development process due to its diverse measurement abilities. Additionally, when using this technique, the sample is neither influenced nor destroyed during the measurement. This means that consecutive measurements of the same sample are possible.

To learn more, click here to watch Metrohm's webinar titled Li-ion batteries and Electrochemical Impedance Spectroscopy | Metrohm