Research progress of the electrochemical impedance technique applied to the high-capacity lithium-ion battery

The world's energy system is changing dramatically. Li-ion battery, as a powerful and highly effective energy storage technique, is crucial to the new energy revolution for its continuously expanding application in electric vehicles and grids. Over the entire lifetime of these power batteries, it is essential to monitor their state of health not only for the predicted mileage and safety management of the running electric vehicles, but also for an end-of-life evaluation for their repurpose. Electrochemical impedance spectroscopy (EIS) has been widely used to diagnose the health state of batteries quickly and nondestructively. In this review, we have outlined the working principles of several electrochemical impedance techniques and further evaluated their application prospects to achieve the goal of nondestructive testing of battery health. EIS can scientifically and reasonably perform real-time monitoring and evaluation of electric vehicle power batteries in the future and play an important role in vehicle safety and battery gradient utilization.

Automated summary

Li-ion batteries play a crucial role in the new energy revolution, and monitoring their health status is essential for vehicle safety and battery reuse. Electrochemical impedance spectroscopy can quickly diagnose the health status of batteries in a nondestructive way, and is expected to play an important role in the field of electric vehicles in the future.