Heterogeneous Behavior of Lithium Plating during Extreme Fast Charging
Cell Reports Physical Science
Linking the global and local behavior of lithium plating using electrochemistry and high-energy X-ray diffraction during fast charging of lithium-ion batteries, Tanim et al. report the consequent cycle life implications. Distinct and highly variable plating triggered by anode heterogeneity limits cycle life. Understanding these heterogeneities is crucial for identifying pathways to enable fast charging. SUMMARY Broad use of global or spatially averaging measurements over a cell to characterize
... ll to characterize highly localized Li plating phenomena in lithium-ion batteries during fast charging has created a disconnect between measurements and the underlying causes. Consequently, the field is missing a clear path to implementing fast charging as well as to expand into extreme fast charging (XFC). Aiming to bridge these gaps, we present a detailed look into local detection of Li plating and the consequent cycle life implications for electrodes and cells under XFC by utilizing electrochemistry and high-energy X-ray diffraction. Significant heterogeneity in Li plating during XFC results in accelerated and non-uniform cycle life losses, in contrast to the prevailing acceptance that C rate is correlated to Li plating for XFC. This behavior is triggered by local electrode heterogeneity, which has yet to be identified and is not apparent in volume-averaged quantifications. A better understanding of these multiscale local electrode heterogeneities is crucial for identifying pathways to enable XFC.