(Invited) Lithium Plating and Its Impact on the Safety of Lithium-Ion Cell

Lithium plating is prone to occur in lithium-ion cell (LIC) under quick charging at low temperature. The morphology, distribution, and amount of plated lithium depends on the operation conditions and cell design, and in turn, will cause capacity fade and may induce short circuit or even dramatic safety events. This talk will introduce our systematic study on the interrelationship among the operation conditions, the plated lithium, and the safety characteristics using both coin cells and pouch cells. Key safety parameters are extracted from the accelerated rate calorimeter test of new and lithium-plated cells. The events leading to the thermal runaway are examined and compared with multi-physics measurement, including pressure, stress, and electrochemical impedance spectroscopy (EIS) etc. Implications for the cell design improvement, battery management optimization, and early detection techniques will be discussed.