Recycling of Lithium-Ion Batteries by Arno Kwade & Jan Diekmann

Author:Arno Kwade & Jan Diekmann
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

It can be seen that next to the evaporated solvents also the additive cyclo hexyl benzene and HF are released. Although the concentration of HF seems to be very small, it is around 17 times higher than the IDLH (immediately dangerous to life and health) of 30 mg * m−3.

A possibility to eliminate this reaction seemed to be cooling, as rise of the temperature is one of the triggers. Therefore, battery cells (PHEV 1, 25 Ah) were cooled with dry ice and acetone to core temperatures of around 65 ℃. This treatment enabled safe crushing of loaded battery cells, but only shifts the decomposition of the conducting salt.

In order to decrease the time needed for discharging and to set limits for crushing of battery cells which cannot be discharged due to internal cell failures, the project partners varied the SOC. Depending on the battery chemistry and capacity, a SOC of 30% for safe crushing was discovered. As expected, battery cells with the cathode active material lithium nickel aluminum oxide (NCA) show a higher reactivity.

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