Thermal stability of LiPF6/EC+DEC electrolyte with charged electrodes for lithium ion batteries

Electrolyte and Solid-Electrolyte Interphase Layer in Lithium-Ion Batteries

“…Ping et al [Ping, 2010] confirmed that the addition of lithium salt reduces drastically the thermal stability of the solvent due to the strong Lewis acidity of PF 5 in the case of LiPF 6 and BF 3 in the case of LiBF 4 even if BF 3 is a weaker Lewis acid than PF 5 . The following mechanism of degradation was proposed according to different works reported in the literature [Ping, 2010;Sloop, 2003;Wang, 2005 ;Gnanaraj, 2003a ;Gnanaraj, 2003b The results of the thermal stability studies show that the thermal stabilities of lithium salt in inert atmosphere can be ranked as LiTFSI (lithium bis(trifluoromethylsulfonyl)imide) <LiPF 6 <LiBOB (lithium bis(oxalate)borate)<LiBF 4 and the thermal stabilities of EC electrolytes follows this order: 1 M LiPF 6 /EC + DEC<1 M LiBF 4 /EC + DEC<1 M LiTFSI/EC + DEC< 0.8 M LiBOB/EC + DEC. Nevertheless, it may be pointed out that electrocatalytic reactions onto the positive electrode associated with high reactivity of the electrolyte at high temperature can significantly reduce the thermal stability compared to the thermal stability of the electrolyte without any contact with a positive electrode.…”

Lessons Learned from the 787 Dreamliner Issue on Lithium-Ion Battery Reliability

“…If lithium-ion batteries are operated outside of a specific voltage and temperature window, degradation is accelerated and the probability of a catastrophic failure is increased. If the battery is charged above its upper voltage limit, excessive heat generation will cause the electrolyte to become unstable and undergo decomposition reactions [14]. These reactions can be further accelerated by increased temperatures.…”

Catastrophe analysis of cylindrical lithium ion battery

“…The compounds of the lithium ion battery were studied separately firstly, and then some thermal models were introduced. Electrolyte, cathode and anode are the major compounds in the lithium ion battery and therefore their thermal stability were studied more widely and deeply by using many kinds of thermal techniques, such as differential scanning calorimetry (DSC) [3][4][5][6][7][8][9][10][11], accelerating rate (ARC) [12][13][14][15][16], thermogravimetry (TG) [3,[17][18][19] and C80 calorimetry [20][21][22][23][24][25][26][27]. Supported by these results, some lithium ion battery thermal models were produced [28][29][30][31][32][33], and the safety mechanisms were explored [34,35].…”