Aged diagnosis of lithium-ion battery based on electrochemical impedance spectroscopy technique

Lithium-ion battery has a superior performance among energy storage devices, including working voltage, energy density, and power capability. Because of these outstanding operational value, lithium-ion battery has been widely used in mobile applications and nowadays find their way gradually into the automotive applications. This wider field of usage demands a comprehensive understanding of the reaction process inside the lithium-ion battery. Therefore we have to give general explanation of the energy storage mechanism inside the lithium-ion battery. EIS is a non-destructive testing methods which is presented as a suitable technique for detecting the encapsulated cells. In addition, EIS can also display the change of cell impedance when the lithium-ion battery aged. It was shown that the impedance spectra of lithium-ion battery is significantly increasing as the number of cycles increases and the origins of these changes were outlined. By studying the impedance spectra of lithium-ion battery, a link between the rise in impedance and loss in capacity was found and a comprehensive method to predict the SOH of lithium-ion battery was given. In this study, aging examination of lithium-ion battery using different electrode materials has been shown. In the future, more and different types of lithium-ion batteries could be investigated, in order to identify and analyze similarities in their changes in behavior during the aging process. In conclusion it can be said, that good progress was made in understanding and predicting the aging behavior of lithium-ion battery modelling using EIS measurements. Nevertheless, challenging tasks are awaiting in the promising field of lithium-ion battery research.