Calorimetric studies of the thermal stability of electrolyte solutions based on alkyl carbonates and the effect of the contact with lithium

Safety Improvement of Lithium Ion Battery by Organofluorine Compounds

“…In the case of linear carbonates, lithium alkyl carbonates may be formed by one-step reactions as shown in Eqns (7.5)-(7.7). These exothermic peaks would be due to the reaction of Li deintercalated from LiC 6 with SEI because lithiated graphite is decomposed by a temperature increase to approximately 200 °C [52,[57][58][59][60][61]. [45,46].…”

“…Exothermic reactions started at 238 °C for fluorine compounds A, B, and G, and at 226 °C for C. Those for H and I started at slightly higher temperatures, 254 and 261 °C, respectively, and their exothermic peaks were found between 246 and 283 °C. The exothermic peaks between 250 and 300 °C are due to the decomposition of SEI and electrolyte solutions [52,[57][58][59][60][61]. Thus, fluorine compounds used in the study have a higher stability than that of the solvent mixture, EC/DMC against metallic Li.…”

Characterization of SiO2 and Al2O3 incorporated PVdF‐HFP based composite polymer electrolytes with LiPF3(CF3CF2)3

“…These authors content that LiFAP has a combination of flame-retardant moieties, fluorinated derivatives, and phosphoric acid esters. Gnanaraj and coworkers [11][12][13][14][15] investigated the thermal stability of solutions of LiPF 6 and LiFAP in EC-DEC-DMC mixtures using accelerating rate calorimetry (ARC) and showed that the onset temperature for thermal reactions of LiFAP solutions are higher than 2008C (LiPF 6 solutions: <2008C) although their self-heating rate is very high.…”

Polyvinylidene fluoride–hexafluoropropylene (PVdF–HFP)-based composite polymer electrolyte containing LiPF3(CF3CF2)3

“…Lithium tris(pentafluoroethyl) trifluorophosphate/lithium fluoroalkyl phosphate, LiPF 3 (CF 3 CF 2 ) 3 (LiFAP) has been proposed as a potential alternative to LiPF 6 , which is beset with problems of easy hydrolyzability [15][16][17][18][19][20][21], as noted above. The premise for its development was that the substitution of one or more fluorine atoms in LiPF 6 with perfluorinated alkyl groups would stabilize the P-F bond, rendering the product stable against hydrolysis.…”

“…Oesten et al [17] showed that LiFAP exhibited a far superior stability towards hydrolysis and that electrolytes containing LiFAP exhibited reduced flammability, as a result of the presence in the LiFAP molecule of a combination of flame-retardant moieties, fluorinated derivatives and phosphoric acid esters. Gnanaraj et al [20,21], who investigated the thermal stability of solutions of LiPF 6 and LiF-AP in EC-DEC-DMC mixtures using accelerating rate calorimetry, showed that the onset temperature for thermal reactions of LiFAP solutions were higher than 200°C (LiPF 6 solutions: <200°C) although their self-heating rate was very high. LiFAP is a weakly coordinating bulky anion (anionic size 0.377 nm) because of its large ion contact distance (225 Å 3 ).…”