|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials for Energy Conversion and Storage
||The Transition from Unfavorable Lithium Plating to Destructive Lithium Dendrites
||Corey T Love, Rachel Carter
|On-Site Speaker (Planned)
||Corey T Love
Safety of Li-ion batteries is of growing concern as demand steadily increases. Thermal runaway failures typically originate from internal short circuits (ISC) created by electrodeposited dendritic lithium metal at the anode surface. This talk will present the effects of temperature, current density and anode microstructure on the morphology of electrodeposited lithium, spanning from mossy to dendritic. In most cases, electrodeposition of mossy lithium leads to a loss of reversible capacity of the cell. Unstable dendritic lithium structures not only decrease the amount of available lithium leading to capacity fade, but can also trigger ISCs leading to cell venting and fires. In-situ optical observation of galvanostatic plating and stripping experiments provide valuable understanding of morphology, growth behavior, and ISC severity. These observations are then coupled with cell impedance changes detected through electrochemical impedance spectroscopy to develop advanced diagnostic and fault detection techniques.