A study on overcharge behavior of high-power type lithium-ion battery with Li(Ni 1/3 Mn 1/3 Co 1/3 )O 2 as cathode material

The room temperature overcharge behavior of high-power type lithium-ion batteries (maximum discharge rate 50 C) with Li(Ni 1/3 Mn 1/3 Co 1/3 )O 2 as the cathode is carefully explored in this work at varied current rates. There are five stages in the overcharge procedure. Under conditions where battery rupture is a warning sign and charging is quickly stopped, overcharge at the current rates not exceeding 3 C does not lead to uncontrollable combustion and explosion. There are differences in the overcharge voltage characteristics of the battery at different charging rates. As the charge current rates increase, the amount of power that the lithium-ion battery can receive before the battery outsourcing ruptures decreases, while the peak voltage increases. The internal resistance at 0.5 C overcharge is measured by the hybrid pulse power characterization method, and the reason for the rapid rise of voltage in the stage 3 is the rapid increase of the polarized internal resistance. Then, the accumulated heat analysis knows that the internal heat production is mainly contributed by the side reactions. In addition, a large amount of H 2 , CO, CH 4 , C 2 H 4 and CO 2 are collected at the moment of battery outsourcing ruptures. These findings are useful for the battery management system's safety monitoring function, which is important for the safe use of high-power type lithium-ion batteries.