Thermal Runaway of a Commercial 18650 Li-Ion Battery with a NCA Cathode - Impact of SOC and Overcharge
We examined the TR characteristics of a commercially available 18650 cell made by a well known manufacturer. This cell is based on Lix(Ni0.80Co0.15Al0.05)O2cathode and has energy density of 254Wh/kg. Destructive temperature-ramp experiments with discharged, partially charged as well as fully charged and over-charged cells were done. Additionally, we dismantled one cell to make a mass split and to identify the compositions of the cell components.
In the presentation correlations between SOC and the TR parameters (onset temperature, max. temperature, amount of produced vent-gas, vent-gas composition) will be shown. An attempt will be made to rationalise the amount and composition of the vent-gas with a simplified chemical reaction system.