Study on the kinetics properties of lithium hexafluorophosphate thermal decomposition reaction

Abstract The thermal decomposition of lithium hexafluorophosphate was studied by using C80 calorimeter, and the samples were heated at a 0.2 K·min − 1 heating rate from ambient temperature to 573 K in pressure-sensitive transducer fitted and sealed vessel with argon atmosphere. It is found that LiPF 6 decomposes near 433 K, and the gas product PF 5 causes the pressure increasing. The LiPF 6 decomposition reaction order is calculated based on the pressure data by two methods, its average value is n  = 1.5, then, the reaction is assumed to be dependent on the Arrhenius law and mass action law, and thus the activation energy and pre-exponential factor were calculated to be E  = 104.2 kJ·mol − 1 , A  = 1.12 × 10 7 s − 1 , respectively.