2023 AIChE Annual Meeting
A Quantitative Figure of Merit for the Conductive Properties of Battery SEI
Solid electrolyte interphase (SEI), the passivation film found on the face of battery electrodes, has been extensively studied since its discovery in 1979. However, despite its impact on battery performance, many properties of the SEI, including its conductivity, remain unquantified. In this paper, we use a new cell structure in which the SEI serves in place of a separator in symmetric Li|Li cells to illustrate the ionically conductive properties of SEI and numerically quantify these values. Thus, the conductive properties of SEI are much more clearly and quantifiably understood as it is used as a separatory cell component.