Broadband electrical spectroscopy (BES) for Li-ion Impedance

Broadband electrical spectroscopy (BES) is a powerful technique that can be used to study the behavior of lithium-ion cells in real time. BES is a non-invasive technique that measures the electrical impedance of a cell across a wide frequency range, providing valuable information about the electrochemical processes that occur during charging and discharging.

One of the main advantages of BES is that it allows for in situ measurements, meaning the cell can be tested while it is in operation. This is particularly useful for studying the behavior of lithium-ion cells under real-world conditions. Additionally, BES can provide information about the state of charge (SOC) and state of health (SOH) of a cell, which is important for monitoring the performance of a battery pack.

BES has been used to study a wide range of lithium-ion cells, including those based on different electrode materials and electrolytes. For example, researchers have used BES to study the behavior of lithium cobalt oxide (LiCoO2) and lithium iron phosphate (LiFePO4) cells. By comparing the results of BES measurements with other techniques, such as cyclic voltammetry, researchers have been able to gain better understanding of the electrochemical processes that occur in lithium-ion cells.

In addition to providing information about the SOC and SOH of a cell, BES can also provide information about the kinetics of the charging and discharging processes, the impedance characteristics of the electrodes, and the distribution of lithium ions in the electrolyte. This information can be used to optimize the performance and safety of lithium-ion cells by identifying and addressing issues such as capacity fading, self-discharge, and overcharging.