1 research outputs found
Role of Amines in Thermal-Runaway-Mitigating Lithium-Ion Battery
Benzylamine (BA), dibenzylamine (DBA),
and trihexylamine (THA)
are investigated as thermal-runaway retardants (TRR) for lithium-ion
batteries (LIBs). In a LIB, TRR is packaged separately and released
when internal shorting happens, so as to suppress exothermic reactions
and slow down temperature increase. THA is identified as the most
efficient TRR. Upon nail penetration, 4 wt % THA can reduce the peak
temperature by nearly 50%. The working mechanisms of the three amines
are different: THA is highly wettable to the separator and immiscible
with the electrolyte, and therefore, it blocks lithium-ion (Li<sup>+</sup>) transport. BA and DBA decrease the ionic conductivity of
electrolyte and increase the charge transfer resistance. All three
amines react with charged electrodes; the reactions of DBA and THA
do not have much influence on the overall heat generation, while the
reaction of BA cannot be ignored